Supplements for Skin, Hair, and Nails: What Actually Helps

By Dr. Ryan Kneessi, ND — licensed naturopathic doctor in Maryland · Move Forward Natural Health, Odenton, MD (in-office and telehealth visits) · Last reviewed: October 9, 2026

What drives skin aging, hair loss and brittle nails?

• Slower collagen and hyaluronic acid production with age
• Glycation: sugar molecules stiffen collagen
• Inflammation and oxidative stress from sun, pollution and diet
• Declining estrogen, testosterone or thyroid hormone
• Low protein, iron, zinc, vitamin C or biotin

Nutrients with the most support

• Collagen peptides: studied for skin elasticity and hydration
• Vitamin C: required to build collagen (see who should consider vitamin C)
• Zinc, balanced with copper: for skin repair and hair (see who should consider zinc)
• Omega-3s: support the skin barrier and calm inflammation
• Biotin: helpful for brittle nails when intake is low
• Oral hyaluronic acid and silica: studied for skin moisture and hair and nail strength
• Astaxanthin and Polypodium leucotomos: studied as internal support against UV damage, alongside sunscreen
• Glycine and proline: building blocks of collagen

If you work with me, the products I use are in my Fullscript dispensary.

Best practices

• Pair vitamin C with collagen
• Take fat-soluble nutrients such as astaxanthin and omega-3s with meals
• Be patient: skin, hair and nails turn over slowly, so give changes a few months
• Use daily sunscreen and avoid smoking

Hair loss: look deeper

Hair shedding often reflects something internal, such as low iron, thyroid changes, hormone shifts, stress or illness. See who should consider iron and natural remedies for thyroid issues.

Skin, hair and healthy aging

Skin shows aging processes we cannot see elsewhere: oxidative damage, chronic inflammation, glycation and a slowdown in stem cells that renew tissue. Supporting collagen, protecting against UV and keeping blood sugar steady supports skin today and overall healthy aging.

Safety

High-dose biotin can interfere with some lab tests, including thyroid and heart tests, so tell your provider and lab if you take it. According to the NIH Office of Dietary Supplements, adults need 30 mcg of biotin a day. Discuss supplements with your provider, especially in pregnancy.

When to see a naturopathic doctor

• You have hair shedding or thinning
• Your nails are brittle or skin is dry despite good skin care
• Skin changes came with fatigue, cycle changes or weight changes
• You want a nutrition plan for skin, hair and nails

See a medical provider promptly for sudden patchy hair loss, a mole that changes, a sore that will not heal, or a rapidly spreading rash.

Frequently asked questions

Sources

• NIH Office of Dietary Supplements: Biotin (Consumer Fact Sheet)
• MedlinePlus: Hair Loss

This article is for educational purposes only and is not medical advice. It does not replace an individual evaluation. Talk with your healthcare provider before starting supplements or changing medications, especially if you are pregnant, nursing, or managing a health condition.