Collagen shopping includes powders and combination tablets rather than one uniform format. For example, Collagen Peptides Powder – Hair, Skin, Nails & Joint Support – Unflavored (20 oz. / 28 Servings) identifies an unflavored powder with a stated package size and serving count. Compare collagen source, complete ingredients and portion information on each label. Do not assume every collagen listing is a complete protein, has the same source or produces a predictable skin or joint result.