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A 2023 meta-analysis of 26 randomized controlled trials (1,721 participants) found hydrolyzed collagen significantly improved skin hydration and elasticity versus placebo, with benefits typically appearing after 812 weeks of daily use

Shelley AM, Ward PB, Catts SV, Michie PT, Andrews S, McConaghy N (1991)

Centanni M, Duntas L, Feldt-Rasmussen U, Koehrle J, Peeters RP, Razvi S et al (2025) ETA guidelines for the use of levothyroxine sodium preparations in monotherapy to optimize the treatment of hypothyroidism

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