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  • A glass medicine bottle with a black cap, label showing Guardian Labs logo and the text GL-3 RT, 20 mg, for research use only.
    Glass medicine vial with black cap; label shows Guardian Labs and GL-3 RT, 15 mg dosage.
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    GL-3 RT

    Price range: $82.00 through $185.00 - or subscribe

    GL-3 RT is Guardian Labs’ retatrutide (LY3437943), a synthetic peptide that acts as an agonist at the GIP, GLP-1 and glucagon receptors, studied in metabolic and incretin-receptor research. Available in several vial sizes as lyophilized powder. Research use only.

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