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Satoh K, Kitahara A, Sato K

Results demonstrated significant improvements in sleep efficiency and subjective sleep quality ratings in the DSIP treatment group, with particular enhancement of the first sleep cycle and improved transition into slow-wave sleep

Animal models of localized IGF-1 overexpression show muscle hypertrophy is satellite cell-dependent (PMID 10632630), and satellite cell activation in humans requires mechanical loading

Collagen peptides Recommended for competitive bodybuilders or powerlifters Pros Evidence for increasing muscle mass and strength in combination with resistance training No serious side effects in people who arent allergic Not prohibited by the World Anti-Doping Agency Normally doesnt require subcutaneous injection Readily available over-the-counter Cons Unknown how collagen compares to other peptides for muscle growth and injury recovery Typically not vegetarian- or vegan-friendly Collagen peptides are unique among our recommendations because: They arent prohibited by the World Anti-Doping Agency.39 They pose no risk of serious side effects in people who arent allergic.6 Theyre bioavailable via oral administration.12 You dont need a prescription to get them

L-lysine also helps in the absorption of calcium, which is important for healthy skin, bones, and tissues