-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
 MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen
 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 KR7uIU118omd64jzhB+fpslZHH/JnOhT05HkGVRA1XPNZNV2v9Bd1fHxVAsUGzHY
 4t0QtlF2gksUQ14ghxAkAQ==

<SEC-DOCUMENT>0001181431-03-010430.txt : 20030609
<SEC-HEADER>0001181431-03-010430.hdr.sgml : 20030609
<ACCEPTANCE-DATETIME>20030609170100
ACCESSION NUMBER:		0001181431-03-010430
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20030321
FILED AS OF DATE:		20030609

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			HERNDON DONALD W
		CENTRAL INDEX KEY:			0001230581

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-24657
		FILM NUMBER:		03737792

	BUSINESS ADDRESS:	
		STREET 1:		1109 ALSPAUGH LANE
		CITY:			GRAND PRAIRIE
		STATE:			TX
		ZIP:			75052

	MAIL ADDRESS:	
		STREET 1:		1109 ALSPAUGH LANE
		CITY:			GRAND PRAIRIE
		STATE:			TX
		ZIP:			75052

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MANNATECH INC
		CENTRAL INDEX KEY:			0001056358
		STANDARD INDUSTRIAL CLASSIFICATION:	MEDICINAL CHEMICALS & BOTANICAL PRODUCTS [2833]
		IRS NUMBER:				752508900
		STATE OF INCORPORATION:			TX
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		600 SOUTH ROYAL LANE
		STREET 2:		SUITE 200
		CITY:			COPPELL
		STATE:			TX
		ZIP:			75019
		BUSINESS PHONE:		9724717400

	MAIL ADDRESS:	
		STREET 1:		600 SOUTH ROYAL LANE
		STREET 2:		SUITE 200
		CITY:			COPPELL
		STATE:			TX
		ZIP:			75019
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>rrd10766.xml
<DESCRIPTION>FORM 3 - INITIAL FILING
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>
    <schemaVersion>X0101</schemaVersion>

    <documentType>3</documentType>
<periodOfReport>2003-03-21</periodOfReport>
    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001056358</issuerCik>
        <issuerName>MANNATECH INC</issuerName>
        <issuerTradingSymbol>MTEX</issuerTradingSymbol></issuer>
<reportingOwner>
<reportingOwnerId>
            <rptOwnerCik>0001230581</rptOwnerCik>
            <rptOwnerName>HERNDON DONALD W</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>  </rptOwnerStreet1>
            <rptOwnerStreet2>  </rptOwnerStreet2>
            <rptOwnerCity>  </rptOwnerCity>
            <rptOwnerState>  </rptOwnerState>
            <rptOwnerZipCode>  </rptOwnerZipCode>
        </reportingOwnerAddress>
            <reportingOwnerRelationship>
<isDirector>0</isDirector>
<isOfficer>0</isOfficer>
<isTenPercentOwner>0</isTenPercentOwner>
<isOther>1</isOther>
<officerTitle></officerTitle>
<otherText>member of Sec 13(d) group (1)</otherText></reportingOwnerRelationship></reportingOwner>
<nonDerivativeSecurity>
<securityTitle>
<value>Common Stock, par value $0.0001 per share</value>
<footnoteId id="F1"/></securityTitle>
<transactionAmounts>
<transactionShares>
<value>336000</value></transactionShares></transactionAmounts>
<ownershipNature>
<directOrIndirectOwnership>
<value>D</value></directOrIndirectOwnership>
<natureOfOwnership>
<value></value></natureOfOwnership></ownershipNature></nonDerivativeSecurity>
<derivativeSecurity>
<securityTitle>
<value>Stock Options - Right to buy common stock</value></securityTitle>
<conversionOrExercisePrice>
<value>2.63</value></conversionOrExercisePrice>
<exerciseDate>
<value>2001-08-23</value></exerciseDate>
<expirationDate>
<value>2010-08-23</value></expirationDate>
<underlyingSecurity>
<underlyingSecurityTitle>
<value>Common Stock, par value $0.0001 per share</value></underlyingSecurityTitle>
<underlyingSecurityShares>
<value>15000</value></underlyingSecurityShares></underlyingSecurity>
<ownershipNature>
<directOrIndirectOwnership>
<value>D</value></directOrIndirectOwnership>
<natureOfOwnership>
<value></value></natureOfOwnership></ownershipNature></derivativeSecurity>
<footnotes>
<footnote id="F1">Mr. Herndon, the person, is a member of a Section 139d) group that owns more than 10% of Mannatech&apos;s outstanding common stock.</footnote></footnotes>
<ownerSignature>
<signatureName>/s/ Donald W. Herndon</signatureName>
<signatureDate>2003-06-09</signatureDate></ownerSignature></ownershipDocument>


</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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