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Description
FGF21 as modulator of metabolism in health and disease

Research has also indicated that L-carnitine plays a role in boosting the number of testosterone receptors, enhancing nitric oxide production, and may facilitate the action of the anabolic hormone IGF-1

Boskailo, Esad, Aldin Malkoc, Dustin B

Ye et al
This claim has never been substantiated, and likely originated from equine research
