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Instead, by improving elasticity and helping hair retain moisture, collagen peptides may reduce breakage

This study design gives researchers confidence that any improvement is due to the treatment, not other factors

They can state that glutathione 'supports antioxidant activity' or 'promotes cellular health' because those are structure-function claims permitted under 21 CFR 101.93

Biochemical Pharmacology

Of course, 100 mg of protein is a lot for most applications so you may be fine with that yield and not care about losing some of your protein in the flow-through, depending on what the downstream application is for your protein

My hair has grown back and my nerve problems are much better, though not perfect