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[27] confirmed the positive influence biotin has on hair and nail growth disorders
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During development, we also identified a common issue: many supplements on the market use underdosed ingredients or rely on capsules that simply cannot hold clinically meaningful quantities
doi: 10.1016/j.cmet.2016.02.005 Masharani U, Kroon L (2024): Pancreatic Hormones & Antidiabetic Drugs (Chapter 41)
The effect size differs by roughly an order of magnitude
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