<SEC-DOCUMENT>0001179110-17-013677.txt : 20171102
<SEC-HEADER>0001179110-17-013677.hdr.sgml : 20171102
<ACCEPTANCE-DATETIME>20171102185229
ACCESSION NUMBER:		0001179110-17-013677
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20171031
FILED AS OF DATE:		20171102
DATE AS OF CHANGE:		20171102

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Gull Global Ltd
		CENTRAL INDEX KEY:			0001636301

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-35024
		FILM NUMBER:		171174124

	BUSINESS ADDRESS:	
		STREET 1:		PO BOX N-4899, 2/F BAHAMAS FINANCIAL CTR
		STREET 2:		SHIRLEY & CHARLOTTE STREETS
		CITY:			NASSAU
		STATE:			C5
		ZIP:			BH1-1000
		BUSINESS PHONE:		8019547100

	MAIL ADDRESS:	
		STREET 1:		PO BOX N-4899, 2/F BAHAMAS FINANCIAL CTR
		STREET 2:		SHIRLEY & CHARLOTTE STREETS
		CITY:			NASSAU
		STATE:			C5
		ZIP:			BH1-1000

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			USANA HEALTH SCIENCES INC
		CENTRAL INDEX KEY:			0000896264
		STANDARD INDUSTRIAL CLASSIFICATION:	MEDICINAL CHEMICALS & BOTANICAL PRODUCTS [2833]
		IRS NUMBER:				870500306
		STATE OF INCORPORATION:			UT
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		3838 WEST PARKWAY BLVD.
		CITY:			SALT LAKE CITY
		STATE:			UT
		ZIP:			84120-6336
		BUSINESS PHONE:		8019547100

	MAIL ADDRESS:	
		STREET 1:		3838 WEST PARKWAY BLVD.
		STREET 2:		3838 WEST PARKWAY BLVD.
		CITY:			SALT LAKE CITY
		STATE:			UT
		ZIP:			84120-6336

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	USANA INC
		DATE OF NAME CHANGE:	19930125
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>FORM 4 -
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2017-10-31</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000896264</issuerCik>
        <issuerName>USANA HEALTH SCIENCES INC</issuerName>
        <issuerTradingSymbol>USNA</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001636301</rptOwnerCik>
            <rptOwnerName>Gull Global Ltd</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>PO BOX N-4899, 2/F BAHAMAS FINANCIAL CTR</rptOwnerStreet1>
            <rptOwnerStreet2>SHIRLEY &amp; CHARLOTTE STREETS</rptOwnerStreet2>
            <rptOwnerCity>NASSAU</rptOwnerCity>
            <rptOwnerState>C5</rptOwnerState>
            <rptOwnerZipCode>BH1-1000</rptOwnerZipCode>
            <rptOwnerStateDescription>BAHAMAS</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2017-10-31</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>3292</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>66.0091</value>
                    <footnoteId id="F2"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>12053403</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2017-11-01</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>17107</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F3"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>65.4162</value>
                    <footnoteId id="F4"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>12036296</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2017-11-02</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>22893</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F3"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>65.0245</value>
                    <footnoteId id="F5"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>12013403</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">The holder of record of the shares of Common Stock disposed is Gull Global Limited, an entity wholly indirectly owned and controlled by Dr. Myron W. Wentz.</footnote>
        <footnote id="F2">Weighted average price. Price range in multiple transactions was $66.00 to $66.10, inclusive. The reporting person undertakes to provide USANA Health Sciences, Inc., any security holder thereof or the staff at the Securities and Exchange Commission information regarding the number of shares sold at each price within the ranges set forth.</footnote>
        <footnote id="F3">The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 14, 2017.</footnote>
        <footnote id="F4">Weighted average price. Price range in multiple transactions was $64.85 to $65.85, inclusive. The reporting person undertakes to provide USANA Health Sciences, Inc., any security holder thereof or the staff at the Securities and Exchange Commission information regarding the number of shares sold at each price within the ranges set forth.</footnote>
        <footnote id="F5">Weighted average price. Price range in multiple transactions was $64.40 to $65.40, inclusive. The reporting person undertakes to provide USANA Health Sciences, Inc., any security holder thereof or the staff at the Securities and Exchange Commission information regarding the number of shares sold at each price within the ranges set forth.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>James Bramble, as attorney in fact.</signatureName>
        <signatureDate>2017-11-02</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
