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Beyond prescription medications, some dietary supplements contain amino acid blends or collagen peptides marketed for metabolism, though these are not equivalent to pharmaceutical peptides

Weissferdt A, Pataer A, Swisher SG , Heymach JV, Gibbons DL, Cascone T, Sepesi B

Our bodies produce vitamin D when sunlight hits the skin

Doctors usually recommend a dosage between 6001200 mg, given twice a week

Increased energy and improved mental clarity, increased muscle tone and decred fat storgae, increased libido Ideal for those who are interested in the benefits of testosterone replacement therapy or those who have hormonal conditions

doi: 10.1038/nature03445