<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4/A</documentType>

    <periodOfReport>2020-04-01</periodOfReport>

    <dateOfOriginalSubmission>2020-04-02</dateOfOriginalSubmission>

    <issuer>
        <issuerCik>0000787253</issuerCik>
        <issuerName>NATURAL ALTERNATIVES INTERNATIONAL INC</issuerName>
        <issuerTradingSymbol>NAII</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001115556</rptOwnerCik>
            <rptOwnerName>LEDOUX MARK A</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>1535 FARADAY AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>CARLSBAD</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>92008</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <officerTitle>CEO/Chairman</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2020-04-17</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>25000</value>
                    <footnoteId id="F2"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>55887</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">This Amendment reflects the cancellation of a previously disclosed grant of restricted stock pursuant to the Issuer's 2019 Omnibus Incentive Plan. The proposed grant was cancelled prior to the shares being issued because the 2019 Omnibus Incentive Plan did not become effective.</footnote>
        <footnote id="F2">The proposed grant was cancelled prior to the shares being issued because the 2019 Omnibus Incentive Plan did not become effective.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Kenneth E. Wolf on behalf of Mr. LeDoux pursuant to a Power of Attorney</signatureName>
        <signatureDate>2020-04-25</signatureDate>
    </ownerSignature>
</ownershipDocument>
