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    "title": "Follistatin: Reference Overview and Reconstitution Notes",
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    "tldr": "Follistatin is a naturally produced glycoprotein that binds and blocks myostatin and activin, studied in muscle and metabolic research. Not FDA-approved.",
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        {
            "q": "What is Follistatin-344 and how does it work in research?",
            "a": "FST-344 is a lab-grade, lyophilized form of follistatin, a glycoprotein that binds and inhibits myostatin (GDF-8) and activin within the TGF-beta superfamily, suppressing their signaling in preclinical cell and animal models."
        },
        {
            "q": "How do you reconstitute Follistatin-344 for laboratory use?",
            "a": "Add 0.5–1 mL of bacteriostatic water to a 1 mg vial. 1 mL yields 1 mg/mL; 0.5 mL yields 2 mg/mL. Inject water slowly down the vial wall and swirl gently—never shake—until fully dissolved."
        },
        {
            "q": "Is follistatin banned in competitive sport?",
            "a": "Yes. WADA lists follistatin by name under Prohibited List category S4 (Hormone and Metabolic Modulators) because it reduces myostatin activity. It is banned both in and out of competition."
        }
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