Best Supplements for Hair, Skin and Nails

1. Biotin: Benefits vs Myths

Biotin deficiency can cause hair thinning and brittle nails, but true deficiency is rare. In people with normal levels, there's little evidence biotin improves hair growth.

2. Important: Biotin and Lab Tests

High-dose biotin can interfere with some lab tests, including certain thyroid and cardiac tests, producing falsely high or low results. The FDA has warned about this. Tell your doctor if you take biotin before blood work.

3. What May Help

4. Common Causes of Hair Thinning

Hair thinning can result from genetics, hormonal changes, thyroid issues, iron deficiency, stress, rapid weight loss, certain medications and illnesses. Postpartum hair shedding is also common. Identifying the cause is important, as treatment depends on what's driving the hair loss.

A doctor or dermatologist can order blood tests and recommend treatment.

5. Diet for Healthy Hair, Skin and Nails

Eat enough protein, include iron-rich foods, get healthy fats from fish, nuts and seeds and eat plenty of fruits and vegetables for vitamins and antioxidants. Staying hydrated and avoiding crash diets also support healthy hair, skin and nails.

6. Our Recommendation

Test for deficiencies before buying beauty supplements, and focus on diet first.

7. Collagen for Hair, Skin and Nails

Some studies suggest collagen peptides may improve nail strength and growth and support skin elasticity. Evidence for hair growth is limited. If you try collagen, take 2.5 to 10 grams daily for at least eight to twelve weeks and choose a tested product.

Combining collagen with a protein-rich diet supports overall results.

8. Signs You May Need a Doctor

Sudden hair loss, patchy bald spots, brittle nails with ridges or color changes and persistent skin issues may indicate underlying health conditions that need evaluation.

9. Biotin: What You Should Know

Biotin is the star ingredient in most hair, skin and nails formulas, but true biotin deficiency is rare. Supplements mainly help people who are deficient. High-dose biotin can also interfere with certain lab tests, including thyroid and heart tests, producing falsely high or low results. Tell your doctor if you take biotin before blood work.

Many products contain thousands of percent of the daily value of biotin, far more than most people need.

10. Diet Foundations for Healthy Hair and Skin

Adequate protein, iron, zinc, omega-3 fats, vitamin C and overall calories support healthy hair, skin and nails. Crash dieting is a common cause of hair shedding. Eating a balanced diet usually matters more than any supplement.