This hair, skin, and nails formula is built around a 5,000mcg **biotin** megadose, but that headline ingredient is where the science is weakest. Biotin only reliably improves hair and nails in people who are genuinely deficient, which is rare, and there are essentially no RCTs showing it does anything for everyone else. You're getting the full studied 5,000mcg, but for most people that dose won't move the needle on hair or nail growth.

The supporting vitamins do small but real work. **Vitamin C** at 90mg helps your body build collagen, the protein that gives skin and hair their structure, though that's closer to a daily baseline than the 250mg-plus used in supplement research. You're also getting **zinc** at 7.5mg, roughly half the studied dose for skin and nail support, plus a full 30mg of silicon and a solid dose of vitamin A, both of which contribute to normal skin and hair maintenance.

Where the label leans on skin-specialist ingredients, the doses don't follow through. The **collagen** here is 60mg against the 2,500-10,000mg used in skin studies, and **hyaluronic acid** sits at 1mg versus the 80-200mg in hydration trials, so neither is present in a meaningful amount. One practical note: a 5,000mcg biotin dose can distort lab tests for thyroid and heart markers, so tell your doctor you take it before any bloodwork.