Does Collagen Tighten Skin? What Clinical Trials Measure
The question "does collagen tighten skin?" is really asking about a specific physical property: the feeling and appearance of firmness, the opposite of the looseness and laxity that develops with age. The clinical answer is nuanced. Collagen supplements don't "tighten" skin the way a surgical facelift does by physically removing and repositioning tissue. What they do is improve the structural parameters that create the sensation and appearance of tighter skin: increased dermal density, enhanced elasticity, and more organized collagen fiber architecture. Here's what the evidence shows about each of these...
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