

<!--Generated by EDGARfilings PROfile 3.5.0.0 Copyright 1995 - 2015 Summit Financial Printing, LLC. All rights reserved.-->
<xs:schema targetNamespace="http://mannatech.com/20150630" elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:mtex="http://mannatech.com/20150630" xmlns:us-types="http://fasb.org/us-types/2015-01-31" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:invest="http://xbrl.sec.gov/invest/2013-01-31" xmlns:num="http://www.xbrl.org/dtr/type/numeric" xmlns:nonnum="http://www.xbrl.org/dtr/type/non-numeric" xmlns:dei="http://xbrl.sec.gov/dei/2014-01-31">
  <xs:annotation>
    <xs:appinfo>
      <link:linkbaseRef xlink:type="simple" xlink:href="mtex-20150630_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" />
      <link:linkbaseRef xlink:type="simple" xlink:href="mtex-20150630_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" />
      <link:linkbaseRef xlink:type="simple" xlink:href="mtex-20150630_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" />
      <link:linkbaseRef xlink:type="simple" xlink:href="mtex-20150630_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" />
      <link:roleType roleURI="http://mannatech.com/role/DocumentAndEntityInformation" id="DocumentAndEntityInformation">
        <link:definition>000100 - Document - Document and Entity Information</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://mannatech.com/role/ConsolidatedBalanceSheetsUnaudited" id="ConsolidatedBalanceSheetsUnaudited">
        <link:definition>010000 - Statement - CONSOLIDATED BALANCE SHEETS - (UNAUDITED)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://mannatech.com/role/ConsolidatedBalanceSheetsUnauditedParenthetical" id="ConsolidatedBalanceSheetsUnauditedParenthetical">
        <!--Parent Role: CONSOLIDATED BALANCE SHEETS - (UNAUDITED)-->
        <link:definition>010100 - Statement - CONSOLIDATED BALANCE SHEETS - (UNAUDITED) (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://mannatech.com/role/ConsolidatedStatementsOfOperationsUnaudited" id="ConsolidatedStatementsOfOperationsUnaudited">
        <link:definition>020000 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS - (UNAUDITED)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://mannatech.com/role/ConsolidatedStatementsOfComprehensiveIncomeLossUnaudited" id="ConsolidatedStatementsOfComprehensiveIncomeLossUnaudited">
        <link:definition>030000 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - (UNAUDITED)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://mannatech.com/role/ConsolidatedStatementOfShareholdersEquityUnaudited" id="ConsolidatedStatementOfShareholdersEquityUnaudited">
        <link:definition>040000 - Statement - CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY - (UNAUDITED)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://mannatech.com/role/ConsolidatedStatementsOfCashFlowsUnaudited" id="ConsolidatedStatementsOfCashFlowsUnaudited">
        <link:definition>050000 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS - (UNAUDITED)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://mannatech.com/role/OrganizationAndSummaryOfSignificantAccountingPolicies" id="OrganizationAndSummaryOfSignificantAccountingPolicies">
        <link:definition>060100 - Disclosure - ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://mannatech.com/role/Inventories" id="Inventories">
        <link:definition>060200 - Disclosure - INVENTORIES</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://mannatech.com/role/IncomeTaxes" id="IncomeTaxes">
        <link:definition>060300 - Disclosure - INCOME TAXES</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://mannatech.com/role/EarningsPerShare" id="EarningsPerShare">
        <link:definition>060400 - Disclosure - EARNINGS PER SHARE</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://mannatech.com/role/StockbasedCompensation" id="StockbasedCompensation">
        <link:definition>060500 - Disclosure - STOCK-BASED COMPENSATION</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://mannatech.com/role/ShareholdersEquity" id="ShareholdersEquity">
        <link:definition>060600 - Disclosure - SHAREHOLDERS' EQUITY</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://mannatech.com/role/Litigation" id="Litigation">
        <link:definition>060700 - Disclosure - LITIGATION</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://mannatech.com/role/FairValue" id="FairValue">
        <link:definition>060800 - Disclosure - FAIR VALUE</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://mannatech.com/role/SegmentInformation" id="SegmentInformation">
        <link:definition>060900 - Disclosure - SEGMENT INFORMATION</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://mannatech.com/role/RecentAccountingPronouncements" id="RecentAccountingPronouncements">
        <link:definition>061000 - Disclosure - RECENT ACCOUNTING PRONOUNCEMENTS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://mannatech.com/role/OrganizationAndSummaryOfSignificantAccountingPoliciesPolicies" id="OrganizationAndSummaryOfSignificantAccountingPoliciesPolicies">
        <!--Parent Role: ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES-->
        <link:definition>070100 - Disclosure - ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://mannatech.com/role/OrganizationAndSummaryOfSignificantAccountingPoliciesTables" id="OrganizationAndSummaryOfSignificantAccountingPoliciesTables">
        <!--Parent Role: ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES-->
        <link:definition>080100 - Disclosure - ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://mannatech.com/role/InventoriesTables" id="InventoriesTables">
        <!--Parent Role: INVENTORIES-->
        <link:definition>080200 - Disclosure - INVENTORIES (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://mannatech.com/role/StockbasedCompensationTables" id="StockbasedCompensationTables">
        <!--Parent Role: STOCK-BASED COMPENSATION-->
        <link:definition>080500 - Disclosure - STOCK-BASED COMPENSATION (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://mannatech.com/role/ShareholdersEquityTables" id="ShareholdersEquityTables">
        <!--Parent Role: SHAREHOLDERS' EQUITY-->
        <link:definition>080600 - Disclosure - SHAREHOLDERS' EQUITY (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://mannatech.com/role/FairValueTables" id="FairValueTables">
        <!--Parent Role: FAIR VALUE-->
        <link:definition>080800 - Disclosure - FAIR VALUE (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://mannatech.com/role/SegmentInformationTables" id="SegmentInformationTables">
        <!--Parent Role: SEGMENT INFORMATION-->
        <link:definition>080900 - Disclosure - SEGMENT INFORMATION (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://mannatech.com/role/OrganizationAndSummaryOfSignificantAccountingPoliciesDetails" id="OrganizationAndSummaryOfSignificantAccountingPoliciesDetails">
        <!--Parent Role: ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES-->
        <link:definition>090100 - Disclosure - ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://mannatech.com/role/InventoriesDetails" id="InventoriesDetails">
        <!--Parent Role: INVENTORIES-->
        <link:definition>090200 - Disclosure - INVENTORIES (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://mannatech.com/role/IncomeTaxesDetails" id="IncomeTaxesDetails">
        <!--Parent Role: INCOME TAXES-->
        <link:definition>090300 - Disclosure - INCOME TAXES (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://mannatech.com/role/EarningsPerShareDetails" id="EarningsPerShareDetails">
        <!--Parent Role: EARNINGS PER SHARE-->
        <link:definition>090400 - Disclosure - EARNINGS PER SHARE (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://mannatech.com/role/StockbasedCompensationDetails" id="StockbasedCompensationDetails">
        <!--Parent Role: STOCK-BASED COMPENSATION-->
        <link:definition>090500 - Disclosure - STOCK-BASED COMPENSATION (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://mannatech.com/role/ShareholdersEquityDetails" id="ShareholdersEquityDetails">
        <!--Parent Role: SHAREHOLDERS' EQUITY-->
        <link:definition>090600 - Disclosure - SHAREHOLDERS' EQUITY (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://mannatech.com/role/LitigationDetails" id="LitigationDetails">
        <!--Parent Role: LITIGATION-->
        <link:definition>090702 - Disclosure - LITIGATION (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://mannatech.com/role/FairValueDetails" id="FairValueDetails">
        <!--Parent Role: FAIR VALUE-->
        <link:definition>090800 - Disclosure - FAIR VALUE (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://mannatech.com/role/FairValueDetailsCalc2" id="FairValueDetailsCalc2">
        <!--Parent Role: FAIR VALUE (Details)-->
        <link:definition>090802 - Disclosure - FAIR VALUE (Details) Calc 2</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://mannatech.com/role/SegmentInformationDetails" id="SegmentInformationDetails">
        <!--Parent Role: SEGMENT INFORMATION-->
        <link:definition>090900 - Disclosure - SEGMENT INFORMATION (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
    </xs:appinfo>
  </xs:annotation>
  <xs:import namespace="http://fasb.org/us-gaap/2015-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd" />
  <xs:import namespace="http://xbrl.sec.gov/dei/2014-01-31" schemaLocation="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd" />
  <xs:import namespace="http://xbrl.sec.gov/invest/2013-01-31" schemaLocation="http://xbrl.sec.gov/invest/2013/invest-2013-01-31.xsd" />
  <xs:import namespace="http://xbrl.sec.gov/country/2013-01-31" schemaLocation="http://xbrl.sec.gov/country/2013/country-2013-01-31.xsd" />
  <xs:import namespace="http://xbrl.sec.gov/currency/2014-01-31" schemaLocation="http://xbrl.sec.gov/currency/2014/currency-2014-01-31.xsd" />
  <xs:import namespace="http://xbrl.sec.gov/exch/2015-01-31" schemaLocation="http://xbrl.sec.gov/exch/2015/exch-2015-01-31.xsd" />
  <xs:import namespace="http://xbrl.sec.gov/naics/2011-01-31" schemaLocation="http://xbrl.sec.gov/naics/2011/naics-2011-01-31.xsd" />
  <xs:import namespace="http://xbrl.sec.gov/sic/2011-01-31" schemaLocation="http://xbrl.sec.gov/sic/2011/sic-2011-01-31.xsd" />
  <xs:import namespace="http://www.xbrl.org/2009/role/negated" schemaLocation="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd" />
  <xs:import namespace="http://www.xbrl.org/2009/role/net" schemaLocation="http://www.xbrl.org/lrr/role/net-2009-12-16.xsd" />
  <xs:import namespace="http://xbrl.sec.gov/stpr/2011-01-31" schemaLocation="http://xbrl.sec.gov/stpr/2011/stpr-2011-01-31.xsd" />
  <xs:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd" />
  <xs:import namespace="http://www.xbrl.org/2004/ref" schemaLocation="http://www.xbrl.org/2004/ref-2004-08-10.xsd" />
  <xs:import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd" />
  <xs:import namespace="http://www.xbrl.org/dtr/type/non-numeric" schemaLocation="http://www.xbrl.org/dtr/type/nonNumeric-2009-12-16.xsd" />
  <xs:import namespace="http://www.xbrl.org/dtr/type/numeric" schemaLocation="http://www.xbrl.org/dtr/type/numeric-2009-12-16.xsd" />
  <xs:import namespace="http://fasb.org/us-types/2015-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2015/elts/us-types-2015-01-31.xsd" />
  <xs:import namespace="http://www.xbrl.org/2009/arcrole/fact-explanatoryFact" schemaLocation="http://www.xbrl.org/lrr/arcrole/factExplanatory-2009-12-16.xsd" />
  <xs:element name="CommissionsAndIncentivesPayable" id="mtex_CommissionsAndIncentivesPayable" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" />
  <xs:element name="PropertyPlantAndEquipmentNetExcludingConstructionInProgress" id="mtex_PropertyPlantAndEquipmentNetExcludingConstructionInProgress" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" />
  <xs:element name="DeferredCommissionsRelatedToLoyaltyPrograms" id="mtex_DeferredCommissionsRelatedToLoyaltyPrograms" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" />
  <xs:element name="LitigationAbstract" id="mtex_LitigationAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="LitigationDisclosureTextBlock" id="mtex_LitigationDisclosureTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xs:element name="AverageSharePrice" id="mtex_AverageSharePrice" type="num:perShareItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xs:element name="InterestPaidOnCapitalLeases" id="mtex_InterestPaidOnCapitalLeases" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" />
  <xs:element name="IncreaseDecreaseInCommissionsAndIncentivesPayable" id="mtex_IncreaseDecreaseInCommissionsAndIncentivesPayable" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" />
  <xs:element name="IncreaseDecreaseInDeferredCommissions" id="mtex_IncreaseDecreaseInDeferredCommissions" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" />
  <xs:element name="RecordCompensationExpenseInFutureAbstract" id="mtex_RecordCompensationExpenseInFutureAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="TaxBenefitAssociatedWithUnrecognizedCompensationExpense" id="mtex_TaxBenefitAssociatedWithUnrecognizedCompensationExpense" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" />
  <xs:element name="GrossUnrecognizedCompensationExpenseYearTwo" id="mtex_GrossUnrecognizedCompensationExpenseYearTwo" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" />
  <xs:element name="TotalNetUnrecognizedCompensationExpenseYearTwo" id="mtex_TotalNetUnrecognizedCompensationExpenseYearTwo" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" />
  <xs:element name="TaxBenefitAssociatedWithUnrecognizedCompensationExpenseYearThree" id="mtex_TaxBenefitAssociatedWithUnrecognizedCompensationExpenseYearThree" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" />
  <xs:element name="TotalGrossUnrecognizedCompensationExpenseYearFour" id="mtex_TotalGrossUnrecognizedCompensationExpenseYearFour" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" />
  <xs:element name="TaxBenefitAssociatedWithUnrecognizedCompensationExpenseYearTwo" id="mtex_TaxBenefitAssociatedWithUnrecognizedCompensationExpenseYearTwo" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" />
  <xs:element name="TotalNetUnrecognizedCompensationExpense" id="mtex_TotalNetUnrecognizedCompensationExpense" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" />
  <xs:element name="PercentagesOfStockOptionOwnershipConsideredForHigherExercisePriceOfOption" id="mtex_PercentagesOfStockOptionOwnershipConsideredForHigherExercisePriceOfOption" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xs:element name="TotalNetUnrecognizedCompensationExpenseYearFour" id="mtex_TotalNetUnrecognizedCompensationExpenseYearFour" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" />
  <xs:element name="GrossUnrecognizedCompensationExpenseYearThree" id="mtex_GrossUnrecognizedCompensationExpenseYearThree" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" />
  <xs:element name="TotalNetUnrecognizedCompensationExpenseYearThree" id="mtex_TotalNetUnrecognizedCompensationExpenseYearThree" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" />
  <xs:element name="NumberOfActiveStockBasedCompensationPlan" id="mtex_NumberOfActiveStockBasedCompensationPlan" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xs:element name="GrossUnrecognizedCompensationExpenseToBeRecognizedInCurrentFiscalYear" id="mtex_GrossUnrecognizedCompensationExpenseToBeRecognizedInCurrentFiscalYear" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" />
  <xs:element name="OptionExercisePriceAsPercentagesOfClosingExercisePrice" id="mtex_OptionExercisePriceAsPercentagesOfClosingExercisePrice" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xs:element name="TaxBenefitAssociatedWithUnrecognizedCompensationExpenseYearFour" id="mtex_TaxBenefitAssociatedWithUnrecognizedCompensationExpenseYearFour" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" />
  <xs:element name="StockIncentivePlan2008Member" id="mtex_StockIncentivePlan2008Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="CommissionsAndIncentivesExpense" id="mtex_CommissionsAndIncentivesExpense" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" />
  <xs:element name="NumberOfRegionsInWhichCompanySellsProducts" id="mtex_NumberOfRegionsInWhichCompanySellsProducts" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xs:element name="LoyaltyProgramAbstract" id="mtex_LoyaltyProgramAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="LoyaltyPointsForfeited" id="mtex_LoyaltyPointsForfeited" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" />
  <xs:element name="LoyaltyPointsUnvested" id="mtex_LoyaltyPointsUnvested" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" />
  <xs:element name="PercentageOfSaleReturns" id="mtex_PercentageOfSaleReturns" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xs:element name="DeferredRevenueAssociatedLoyaltyProgram" id="mtex_DeferredRevenueAssociatedLoyaltyProgram" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" />
  <xs:element name="AccruedLeaseRestorationCosts" id="mtex_AccruedLeaseRestorationCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" />
  <xs:element name="LoyaltyPointsVested" id="mtex_LoyaltyPointsVested" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" />
  <xs:element name="ActualReturnsOrCreditsRelatedToPriorPeriods" id="mtex_ActualReturnsOrCreditsRelatedToPriorPeriods" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" />
  <xs:element name="LoyaltyPointsUsed" id="mtex_LoyaltyPointsUsed" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" />
  <xs:element name="CommissionsAndIncentivesAbstract" id="mtex_CommissionsAndIncentivesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="NumberOfBusinessPeriodsPerYear" id="mtex_NumberOfBusinessPeriodsPerYear" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xs:element name="NumberOfWeeksFollowingBusinessPeriodEndForPaymentOfProductSalesCommissions" id="mtex_NumberOfWeeksFollowingBusinessPeriodEndForPaymentOfProductSalesCommissions" type="us-types:durationStringItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xs:element name="NumberOfDaysPerBusinessCycle" id="mtex_NumberOfDaysPerBusinessCycle" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xs:element name="NumberOfWeeksFollowingBusinessPeriodEndForPaymentOfPackSalesCommissions" id="mtex_NumberOfWeeksFollowingBusinessPeriodEndForPaymentOfPackSalesCommissions" type="us-types:durationStringItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xs:element name="LoyaltyDeferredRevenueProgramTableTextBlock" id="mtex_LoyaltyDeferredRevenueProgramTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xs:element name="SalesReturnReserveTableTextBlock" id="mtex_SalesReturnReserveTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xs:element name="NumberOfCountriesInWhichEntitySellsProducts" id="mtex_NumberOfCountriesInWhichEntitySellsProducts" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xs:element name="NumberOfCountriesInWhichEntityNetworkMarketingAndDistributionChannelsOperates" id="mtex_NumberOfCountriesInWhichEntityNetworkMarketingAndDistributionChannelsOperates" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xs:element name="SalesRevenueGoodsPercentage" id="mtex_SalesRevenueGoodsPercentage" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xs:element name="InventoryByCountryAbstract" id="mtex_InventoryByCountryAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="ConsolidatedOtherIncludingFreightMember" id="mtex_ConsolidatedOtherIncludingFreightMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="ConsolidatedPackSalesMember" id="mtex_ConsolidatedPackSalesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="ConsolidatedProductSalesMember" id="mtex_ConsolidatedProductSalesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="MinimumPercentageOfRevenueConsideredForAccountedOfMajorCustomer" id="mtex_MinimumPercentageOfRevenueConsideredForAccountedOfMajorCustomer" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xs:element name="ScheduleOfInventoryBalancesByGeographicalAreaTableTextBlock" id="mtex_ScheduleOfInventoryBalancesByGeographicalAreaTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xs:element name="OtherLongTermLiabilitiesPolicyTextBlock" id="mtex_OtherLongTermLiabilitiesPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xs:element name="OtherAssetsPolicyTextBlock" id="mtex_OtherAssetsPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xs:element name="DocumentAndEntityInformationAbstract" id="mtex_DocumentAndEntityInformationAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="MsDianaAnselmoAndNewDayTodayCorporationMember" id="mtex_MsDianaAnselmoAndNewDayTodayCorporationMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="BusanCustomOfficeMember" id="mtex_BusanCustomOfficeMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="SamuelLCasterAndWonderEnterprisesLLCMember" id="mtex_SamuelLCasterAndWonderEnterprisesLLCMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
</xs:schema>