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Collagen has become one of the most visible supplements on the market. It can now be found in powders, drinks, protein bars, creamers, gummies and products marketed for everything from skin and nails to joints and recovery. The reality is more useful than the marketing: collagen can be a worthwhile supplement, but the form, dose and intended use matter. Different collagen products are not interchangeable. A specialized skin peptide, a hydrolyzed collagen powder and undenatured Type II collagen m …