Collagen supplements (powders, pills) claim skin, hair, nail, joint benefits. Vital Proteins’ blue tubs became Instagram staple after Jennifer Aniston partnership. By 2020, $4B+ market. Research shows modest skin elasticity improvements; joint/hair claims less supported. Collagen breaks down during digestion—body doesn’t directly use it for skin. Bone broth trend overlapped 2015-2018.
Sources: https://www.healthline.com/nutrition/collagen-benefits
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