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You assume the peptide is inactive at the tested concentration

As previously mentioned, safety concerns related to herbal products can be mainly attributed to the herbal ingredient itself, conventional drug-herbal medicine interactions, and contamination or adulteration of herbal remedies with potentially toxic compounds such as heavy metals (Broussard et al., 2010)

in Germany reported the efficacy and safety of a hydrolyzed collagen peptide (HCP) supplement (a commercial product called Colla Sel Pro) in improving skin health in adult female individuals in a double-blind, randomized, placebo-controlled trial using biophysical (Callegari Soft-Plus device) and skin imaging (3D) techniques [48]

Boston, MA: The Health Institute (1994)

Ahmed A, Rahman M, Zhang X, Acevedo CH, Nijjar S, Rushton I, Bussolati B, St John J: Induction of placental heme oxygenase-1 is protective against TNFalpha-induced cytotoxicity and promotes vessel relaxation