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

    <schemaVersion>X0609</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2026-10-19</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001357459</issuerCik>
        <issuerName>PALISADE BIO, INC.</issuerName>
        <issuerTradingSymbol>PALI</issuerTradingSymbol>
        <issuerForeignTradingSymbol></issuerForeignTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0002160299</rptOwnerCik>
            <rptOwnerName>Capers Julien E.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerNonUSAddressFlag>false</rptOwnerNonUSAddressFlag>
            <rptOwnerStreet1>C/O PALISADE BIO, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>4600 SOUTH SYRACUSE STREET, SUITE 900</rptOwnerStreet2>
            <rptOwnerCity>DENVER</rptOwnerCity>
            <rptOwnerState>CO</rptOwnerState>
            <rptOwnerZipCode>80237</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>See Remarks</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>0</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2026-10-19</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>787300</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>787300</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Each Restricted Stock Unit (&quot;RSU&quot;) represents a contingent right to receive one share of the Issuer's common stock. The RSUs are subject to a service-based vesting requirement and twenty-five percent (25%) of the RSUs shall vest on or before the first anniversary of the Vesting Commencement Date (the &quot;Cliff Vesting Date&quot;), which shall be the first Standard Company Vesting Date (as defined below) that falls immediately on or before such anniversary. Following the Cliff Vesting Date, the remaining seventy-five percent (75%) of the RSUs will vest in equal quarterly installments on each subsequent Standard Company Vesting Date, such that the RSUs shall be fully vested no later than the fourth (4th) anniversary of the Vesting Commencement Date, subject to the Reporting Person's continuous service with the Issuer through such date. The Standard Company Vesting Dates are January 6, April 6, July 6, and October 6 of each year.</footnote>
    </footnotes>

    <remarks>General Counsel &amp; Corporate Secretary</remarks>

    <ownerSignature>
        <signatureName>/s/ Julien E. Capers</signatureName>
        <signatureDate>2026-10-21</signatureDate>
    </ownerSignature>
</ownershipDocument>
