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Circulating levels peak in early adulthood and decline significantly with age dropping from roughly 200 ng/mL at age 20 to approximately 80 ng/mL by age 60
10.1016/j.transproceed.2004.12.170 26 Fajardo-PuertaA
The broader discussion of peptides for muscle growth and safe peptides for muscle preservation becomes relevant here for anyone concerned about body composition beyond just the number on the scale
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