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Muscle growth is regulated by many signals.

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Follistatin is a protein that can bind members of that signaling network, including myostatin and

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activins.

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Researchers have explored this biology in muscle disease.

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One early human study delivered a follistatin gene to six people with Becker muscular dystrophy.

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Some participants improved on a walking test, but the study was small and lacked a randomized placebo

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comparison. It cannot establish a general muscle-building treatment.

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Gene delivery also differs fundamentally from a vial sold as follistatin.

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In regulated sport, myostatin-binding proteins such as follistatin are prohibited.

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Product claims need much more than a shared name.