Collagen
Collagen is dosed in grams rather than milligrams, and sold by type: type I and III typically from bovine or marine sources, type II usually from chicken. Products are also labelled as peptides or hydrolysed collagen, which describes processing rather than a different protein.
Compare grams per serving first, then the source and type, then servings per container — a tub sold by weight can hold anywhere from 20 to 60 servings depending on scoop size. Powders dominate here, with capsules needing many units to reach an equivalent gram dose.
See also hair supplements and biotin, or browse all beauty supplements.
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