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The answer- it depends

Oral intake of collagen peptide NS improves hydration, elasticity, desquamation, and wrinkling in human skin: a randomized, double-blinded, placebo-controlled study

Data are the mean values of the area of analyte (A) over the internal standard (IS) per total protein (mg) of n = 4 replicates of one experiment performed independently three times

Our results thus indicated that AITC treatment led to glutathione depletion which contributed to the higher susceptibility of glutathione mutants, but the molecular mechanism behind this physiological response is likely more complicated

One of the most effective is glycolic acid

This is what allows for a multi-use vial, which is standard practice in almost every research lab