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Hair, Skin, & Nail Supplements

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Overview

Skin, hair, and nail health are visible indicators of internal nutritional status and cellular aging. While topical products address the surface, supplementation works from the inside out — supplying the structural proteins, antioxidants, and cellular renewal signals that drive real, lasting results. Double Wood's hair, skin, and nails collection covers the most research-backed ingredients in this category, from collagen peptides and keratin to longevity compounds like NMN and Resveratrol that address aging at the cellular level.

What To Look For

Collagen (in Peptides Powder, Marine Collagen, and Liquid Collagen forms) is the most evidence-backed supplement in this category, with multiple clinical trials showing benefits for skin elasticity, hydration, and nail strength. Keratin is the structural protein of hair and nails and is studied in hydrolyzed form for bioavailability. Resveratrol and NMN support cellular renewal and NAD+ levels, which drive mitochondrial function in skin cells. Liquid Chlorophyll has gained significant consumer interest for skin clarity. Astaxanthin, a carotenoid antioxidant, is one of the most studied topically-relevant antioxidants when taken orally, with evidence for reducing UV-induced skin aging.

Frequently Asked Questions

What type of collagen supplement is best for skin?
Hydrolyzed collagen peptides are the most bioavailable form and the most studied for skin benefits. Type I collagen (predominant in bovine collagen peptides and marine collagen) is the form most relevant to skin elasticity and hydration. Marine Collagen is often preferred for skin specifically due to its smaller peptide size and Type I purity. At least 10 grams per day over 8-12 weeks is the dose most commonly used in positive clinical studies.
Does NMN help with skin aging?
NMN supports NAD+ levels, which are central to cellular energy production and DNA repair — both of which decline with age in skin cells. While direct clinical trials on skin specifically are limited, the mechanism is well-established: declining NAD+ is a driver of the cellular aging that manifests as thinning, wrinkling, and slower wound healing. NMN is frequently paired alongside collagen in anti-aging skin protocols.
What supplements actually help with hair growth and thickness?
Keratin provides the building block of hair protein. Collagen supports the structural matrix around the hair follicle. Resveratrol has some evidence for extending the growth phase of hair follicles. Iron deficiency is among the most common causes of hair loss in women and should be ruled out before supplementing for hair specifically. Double Wood focuses on structural and antioxidant compounds within this collection, which can be paired based on your primary concern.
- All Double Wood supplements are single-ingredient, third-party tested for purity and potency, and manufactured in cGMP-certified U.S. facilities. Certificates of Analysis are available for every product.
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