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Because these compounds are naturally occurring peptides with restricted patentability, opportunities for intellectual property protection and industry-sponsored development are limitedposing substantial barriers to the resource-intensive clinical investigations required to confirm therapeutic efficacy and long-term safety

[PMID: 23626603] Laboratory literature summary: Does L-carnitine improve endothelial function in hemodialysis research subjects

While glutathione has gained attention for potential skin-brightening effects, its licensed use is focused on its antioxidant and detoxifying properties

J Am Acad Dermatol 78(3):599601 e591

BPC-157: : BPC 157