Best Keratin Supplements (2026)

Keratin is the primary structural protein that makes up roughly 90-95% of your hair, as well as significant portions of your nails and the outer layer of skin. As you age, natural keratin production declines, leading to thinner, more brittle hair and weaker nails. Keratin supplements provide hydrolyzed keratin peptides and supporting nutrients that help restore these protein levels from within, offering benefits that go beyond what topical keratin treatments can achieve.

Quick Comparison

Product	Key Ingredient	Form	Best For	Rating
Double Wood Keratin	Keratin 500mg	Capsules	Best Overall	9.5/10
ZEBORA Hair Growth Vitamins	Biotin + Keratin + Collagen	Gummies	Best Gummies	9.2/10
BioSchwartz Hydrolyzed Collagen Peptide	Multi Collagen + Keratin	Capsules	Best Multi-Collagen with Keratin	9.1/10
Collagen Peptides with Biotin & Keratin (Types I-V & X)	Multi Collagen + Biotin + Keratin + HA	Capsules	Best Premium Formula	9.0/10
Collagen Biotin Keratin Complex	Collagen + Biotin + Keratin + HA	Capsules	Best All-in-One	8.9/10

1. Double Wood Keratin Hair Growth Vitamin – Best Overall

Double Wood delivers a clinically relevant 500mg dose of pure hydrolyzed keratin per serving — the exact dose used in research studies showing a 17% improvement in hair strength after 30 days and nearly 50% improvement by 90 days.

Each two-capsule serving provides 500mg of hydrolyzed keratin, matching the dosage used in published clinical research. In one study, dermatologists gave 500mg of keratin daily to 50 women for 90 days, observing significant improvements in hair strength. Another study showed keratin supplementation improved nail strength, smoothness, and whiteness by up to 80% after 90 days. The product is vegan-friendly, non-GMO, gluten-free, and manufactured and tested for safety in the USA. With 120 capsules per bottle, it provides a 60-day supply.

• Pros:
• Clinically studied 500mg dose with published research backing
• Pure keratin — no unnecessary filler ingredients
• Manufactured and third-party tested in the USA

• Cons:
• Results take 30-90 days to become noticeable
• Does not include complementary ingredients like biotin or collagen

Best for: Anyone who wants a research-backed, pure keratin supplement at the clinically studied dose

2. ZEBORA Hair Growth Vitamins with Biotin, Keratin & Collagen – Best Gummies

ZEBORA combines keratin with biotin and collagen in a tasty gummy format, creating a comprehensive hair growth support supplement that covers multiple pathways to stronger, healthier hair.

These gummies bring together three key hair health ingredients — biotin for keratin production support, hydrolyzed collagen for structural support, and keratin itself for direct protein replenishment. The beauty support blend is designed to address hair growth, strength, and shine from multiple angles. The gummy format makes daily supplementation pleasant and eliminates the need to swallow large capsules. ZEBORA formulates for both hair and overall beauty support including skin and nail benefits.

• Pros:
• Triple-action formula with biotin, keratin, and collagen
• Pleasant gummy format for easy daily compliance
• Addresses hair, skin, and nail health simultaneously

• Cons:
• Lower individual keratin dose compared to standalone capsule products
• Contains added sugars inherent to gummy format

Best for: Those who want a multi-ingredient hair beauty gummy with keratin as part of a comprehensive formula

3. BioSchwartz Hydrolyzed Collagen Peptide Capsules – Best Multi-Collagen with Keratin

BioSchwartz delivers a multi-collagen supplement for women featuring hydrolyzed collagen peptides combined with keratin for a protein-rich approach to hair, skin, and nail support.

This capsule supplement provides multiple types of hydrolyzed collagen alongside keratin, creating a comprehensive connective tissue support formula. BioSchwartz is known for their commitment to quality manufacturing and third-party testing. The multi-collagen approach provides types I, II, and III collagen — the most abundant in the body — while the added keratin specifically targets hair and nail protein needs. The capsules are easy to incorporate into a daily supplement routine.

• Pros:
• Multi-type collagen plus keratin for comprehensive protein support
• BioSchwartz reputation for quality and third-party testing
• Targets hair, skin, nails, and joints simultaneously

• Cons:
• Keratin is a complementary ingredient, not the primary focus
• May overlap with standalone collagen supplements

Best for: Women who want collagen and keratin combined in a single supplement for overall beauty support

4. Collagen Peptides Types I, II, III, V & X with Biotin, Keratin & Hyaluronic Acid – Best Premium Formula

This comprehensive formula combines five types of collagen peptides with MCG biotin, keratin, hyaluronic acid, and MSM for one of the most complete hair, skin, and nail support supplements available.

Each serving delivers a multi-type collagen complex (Types I, II, III, V, and X) alongside biotin for keratin production, supplemental keratin for direct protein support, hyaluronic acid for skin hydration, and MSM for sulfur-based structural support. The five collagen types cover virtually every connective tissue need in the body. This kitchen-sink approach means fewer separate supplements are needed, consolidating multiple beauty and wellness ingredients into one product.

• Pros:
• Five collagen types plus keratin, biotin, HA, and MSM
• Replaces multiple individual supplements with one product
• Comprehensive approach to hair, skin, nail, and joint health

• Cons:
• Individual ingredient doses may be lower due to the comprehensive formula
• Multiple active ingredients make it harder to identify what’s working

Best for: Those who want a single all-encompassing beauty supplement with keratin included

5. Collagen Peptides Types I, II, III, V & X with Keratin (60ct) – Best for Hair & Nails

This collagen-keratin combination specifically targets hair and nail strength with a focused formula that pairs multi-type collagen peptides with hydrolyzed keratin and biotin.

Similar to the premium formula above but in a 60-count format, this product provides a curated blend of collagen types with keratin and biotin specifically optimized for hair and nail health. The multi-collagen approach provides structural protein diversity while keratin directly replenishes the dominant protein in hair and nails. The biotin inclusion supports the body’s natural keratin production pathways, creating a supplement that both provides and promotes keratin.

• Pros:
• Targeted formula for hair and nail strength
• Multi-collagen types with keratin and biotin synergy
• Convenient 60-count bottle for a full month’s supply

• Cons:
• Not a standalone keratin product — collagen is the primary ingredient
• Results require consistent use over 2-3 months

Best for: Those focused specifically on improving hair and nail health through protein supplementation

6. Collagen Biotin Keratin Hyaluronic Acid Complex – Best All-in-One

This all-in-one complex brings together collagen, biotin, keratin, and hyaluronic acid with vitamin E and folic acid for a comprehensive beauty supplement that covers every angle of hair, skin, and nail health.

The formula includes collagen for structural support, biotin to support natural keratin synthesis, supplemental keratin for direct protein replenishment, hyaluronic acid for moisture retention, vitamin E for antioxidant protection, and folic acid for cell growth. This breadth of ingredients means a single supplement can address multiple aspects of beauty and wellness. The capsule format is easy to incorporate into existing supplement routines.

• Pros:
• Six active ingredients targeting multiple beauty concerns
• Includes vitamins E and folic acid for additional cellular support
• One supplement replaces multiple individual products

• Cons:
• Broad formula means each individual ingredient is at a lower dose
• May be redundant for those already taking a multivitamin

Best for: Those who want a single daily supplement covering collagen, keratin, biotin, and more

7. Collagen Peptides Types I, II, III, V & X with Keratin (90ct) – Best Extended Supply

The 90-count version of the collagen-keratin peptide complex offers extended value for those committed to long-term supplementation and want to avoid frequent reordering.

This larger bottle provides the same multi-type collagen and keratin formula in a 90-capsule supply, ideal for those who have already tested the formula and want to stock up for consistent, long-term use. The five collagen types (I, II, III, V, and X) combined with biotin, keratin, hyaluronic acid, and MSM create a comprehensive structural protein supplement. The extended supply lowers the per-serving cost and ensures uninterrupted supplementation — important since keratin benefits are cumulative over months of use.

• Pros:
• 90-capsule bottle for extended supply and better per-serving value
• Same comprehensive multi-ingredient formula in a larger count
• Ideal for long-term commitment to hair, skin, and nail health

• Cons:
• Larger upfront investment compared to smaller bottles
• Still a multi-ingredient formula rather than pure keratin

Best for: Those who want the best value on a comprehensive keratin-collagen formula for long-term use

How to Choose the Best Keratin Supplement

The first decision is whether to choose a pure keratin supplement or a multi-ingredient formula that includes keratin alongside collagen, biotin, and other beauty-focused nutrients. Pure keratin products (like Double Wood at 500mg) provide the clinically studied dose in isolation, making it easy to know exactly what you’re getting. Multi-ingredient formulas offer broader support but typically include less keratin per serving.

Dosage is important — clinical research on keratin supplementation uses 500mg per day as the standard dose. Look for products that provide this amount or clearly state how much keratin is in each serving. Avoid products that list keratin as part of a proprietary blend without disclosing the specific amount, as you may be getting a trivial dose.

Hydrolyzed keratin is the preferred form for supplements. Hydrolysis breaks the large keratin protein into smaller peptides that the body can absorb more effectively through the digestive tract. Keratin sourced from wool is the most common supplement form and is generally well-tolerated. Some products use cynatine HNS, a branded form of hydrolyzed keratin with its own research backing.

Look for supplements with third-party testing, GMP manufacturing, and clear labeling. Since keratin results are cumulative and require 30-90 days of consistent use, choose a product you’re comfortable taking daily for several months. Budget accordingly — a 60 to 90-day supply ensures you can evaluate results without interruption.

Frequently Asked Questions

What is keratin and what does it do?

Keratin is a fibrous structural protein that makes up approximately 90-95% of your hair, along with significant portions of your nails and the outer layer of skin. It acts as a protective barrier and gives hair its strength, elasticity, and flexibility. When keratin levels decline due to aging, stress, nutritional deficiencies, or environmental damage, hair becomes brittle and prone to breakage, nails weaken, and skin loses resilience. Keratin supplements provide hydrolyzed keratin peptides to help restore these protein levels from within.

How much keratin should I take daily?

Clinical studies on keratin supplementation typically use 500mg per day. This is the dose that has shown a 17% improvement in hair strength after 30 days and nearly 50% improvement by 90 days in published research. Some multi-ingredient formulas include lower amounts of keratin alongside other supportive ingredients like biotin and collagen, which can still be effective through complementary mechanisms. Follow the manufacturer’s recommended dosage on your specific product.

When is the best time to take keratin supplements?

Keratin supplements can be taken with or without food, though taking them with a meal may improve absorption and reduce the chance of stomach discomfort. There is no specific time of day that is more effective — consistency matters more than timing. Some people prefer taking their beauty supplements in the morning as part of their daily routine, while others take them with dinner. Choose whatever time helps you maintain the daily habit.

Are there any side effects of keratin supplements?

Keratin supplements are generally well-tolerated with minimal side effects. Some users report mild digestive discomfort, particularly when first starting supplementation. People with allergies to wool should exercise caution, as most supplemental keratin is derived from sheep’s wool. Those with kidney disease should consult a healthcare provider before starting any high-protein supplement. If you experience persistent gastrointestinal issues, try taking your keratin supplement with a larger meal.

Can I take keratin with other supplements?

Keratin pairs well with biotin, collagen, vitamin C, and zinc — all of which support hair, skin, and nail health through complementary mechanisms. Biotin specifically supports the body’s natural keratin production, so combining it with supplemental keratin addresses both supply and production. Vitamin C supports collagen synthesis, which works alongside keratin for structural hair support. There are no commonly reported negative interactions between keratin and other supplements or medications.

How long does it take for keratin supplements to work?

Clinical research shows measurable improvements in hair strength within 30 days of daily 500mg supplementation, with more significant results at the 60 and 90-day marks. Nail improvements follow a similar timeline, with studies showing up to 80% improvement in nail strength, smoothness, and appearance by 90 days. Most users report noticing visible differences in hair texture, reduced shedding, and stronger nails within 6-12 weeks. Consistent daily use is essential — skipping days extends the timeline for seeing results.