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They said that it could restore spermatogenesis (conversion of germ cells into sperm in testes) in men whose fertility is affected due to steroid usage

4 Some research has reported that very large maternal doses of vitamin D that exceed the safe upper limit of 4000 IU per day can provide adequate vitamin D to the infant through breast milk

There is much written about 1000mcg oral cyanocobalamin being a good substitute for injections that a patient will absorb 1% by passive diffusion

Bottom line Peptides are being promoted for weight loss, muscle, and skin, but most of what teens see online is not well studied or safe