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Vitamin D deficiency is genuinely linked to barrier dysfunction and conditions like eczema and psoriasis — worth discussing blood levels with a doctor before supplementing.
Best for those with confirmed or suspected vitamin D deficiency, ideally verified through bloodwork given how common deficiency is, particularly in those with limited sun exposure.
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Andrew Lessman Vitamin D3 + K2 from Andrew Lessman is a well-rounded option for those seeking those with confirmed or suspected vitamin D deficiency, ideally verified through bloodwork given how common deficiency is, particularly in those with limited sun exposure. The inclusion of Vitamin D3 (Cholecalciferol) provides supports barrier function and immune regulation. Best suited for those with confirmed or suspected vitamin D deficiency, ideally verified through bloodwork given how common deficiency is, particularly in those with limited sun exposure.
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Vital Proteins
Oral collagen studies generally show modest improvements in skin elasticity and hydration after around 8-12 weeks of consistent daily use — a slower, more gradual effect than topical actives.
NeoCell
Type 1 and 3 collagen specifically are the types most studied for skin — worth checking the label, since not all collagen supplements specify which type they contain.
Sports Research
Biotin supplementation mainly helps people who are actually deficient — most people eating a varied diet already get sufficient biotin and won't see dramatic hair or nail changes from supplementing further.