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doi: 10.1016/s1734-1140(13)71517-2

These functions include regulating circadian rhythm, exerting antioxidant effects, reducing inflammation, and inhibiting apoptosis (Saberi et al., 2019)

Additionally, methionine is a rate-limiting amino acid for protein synthesis and produces cysteine, a precursor to glutathione and taurine (2)

Verify peptide purity through HPLC or mass spectrometry analysis, or source from a supplier with third-party testing

Anchoring this point firmly matters, because it is the factual backbone of the entire injectable-versus-topical comparison: the route with human cosmetic data is the one you apply, not the one you inject