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Most evidence comes from laboratory and animal studies rather than controlled human trials, which means benefits remain investigational

However, you may experience slight bruising and swelling, irritation, minor allergic reactions, or headache

Cyanocobalamin can lead to optic nerve damage (and possibly blindness) in people with Leber's disease

Similarly, in studies of AC2, the Lgr5-binding octapeptide, Sh-Polypeptide 9, and AcSDKP, which promote the proliferation of various cell types, including DPCs, HFSCs, and matrix cells, do not demonstrate therapeutic effects in vivo [95,99,110,113]

Research-grade peptides vary in purity