What Is Biotin?

Biotin, also known as vitamin B7, plays a vital role in converting nutrients into energy and supporting healthy hair, skin and nails. While biotin can be found naturally in foods like meat, dairy and leafy greens, supplementation may provide additional support for those looking to meet their daily needs.

The way our hair looks can be greatly influenced by a long list of possible causes. Anything from stress to genes to nutrition can impact hair health. More of than not, changes result from a combination of different factors.

Your body's biotin levels can be influenced by various factors:

Note: These statements are not intended to diagnose, treat, cure, or prevent any disease or condition, nor are they intended to be substitutes for professional medical advice. Always consult your physician or other qualified healthcare provider for accurate advice, diagnosis, and treatment plan. Individual results may vary.

What To Look For In A Biotin Supplement*

Common Factors That May Impact Biotin Levels

• Poor absorption of nutrients*
• Restrictive dieting habits*
• Certain medications*

• Natural aging process*
• Lifestyle choices*
• Stress levels*

What To Try To Avoid In A Biotin Supplement*

• With Biotin, Collagen, Keratin, and Hyaluronic Acid
• Vitamin-Mineral Blend
• Third-Party Lab Tested
• Made in the USA with Globally Sourced Ingredients
• Free Shipping on Orders Over $75

Based on 3739 Reviews of Primal Harvest

Our Choice

by Nutrafol

PROS

• Clinical testing for safety and effectiveness
• With biotin, vitamin C, zinc and horsetail extract
• Unique ingredient blends
• Subscription

CONS

• Price
• 4-capsule serving size
• Marine collagen (not suitable for seafood allergies)
• 30-day money-back guarantee

BOTTOM LINE

Women's Hair Growth Nutraceutical by Nutrafol is an advanced hair care formula that comes in the form of four capsules per day. It features biotin, vitamins A, C, and D, and marine collagen as its primary ingredients. While this formula contains a wide range of ingredients, it is also formulated with marine collagen which means it may not be suitable for all consumers. Additionally, at 4 capsules per day, this may not be the most convenient supplement to use for everyone. 

3. Women's Hair Growth Nutraceutical

B

GRADE

Hair Growth Complex by Primal Harvest takes the top spot, with a blend of premium ingredients delivered in just two convenient capsules per day. This holistic formula features a strong 5000 mcg of biotin to support hair growth & health, plus an exclusive ingredient called Horsetail-Bio™, an extract made from bamboo leaf, a plant-based source of silica.

It features a wide range of supporting vitamins and minerals, including vitamins C, B3, B6, and B12, as well as the minerals calcium, zinc, and copper. The clever addition of type II collagen, hyaluronic acid, and hydrolyzed keratin round out this exclusive formula.

Hair Growth Complex is third-party lab tested and made in the USA with globally sourced ingredients. The brand also offers a convenient Subscribe & Save program which means you can order Hair Growth Complex through their convenient and hassle-free subscription service. By signing up for a subscription you get 20% off all products plus free shipping.

This biotin supplement delivers great value and quality at a reasonable price point. To top it off, Primal Harvest offers a 90-day money-back guarantee for all of their products. 

• 5000 mcg biotin and RGen-BioTM
• Contains vitamin C, zinc, copper, B vitamins, and horsetail extract
• With type II collagen, hyaluronic acid, and keratin
• Certified third-party testing
• Made in the USA with globally sourced ingredients
• 90-day money-back guarantee

PROS

CONS

• Only available online
• Due to popularity, sometimes runs out of stock

BOTTOM LINE

A+

GRADE

[1] Patel DP, Swink SM, Castelo-Soccio L, A Review of the Use of Biotin for Hair Loss, Skin Appendage Disord. 2017 Aug; 3(3): 166–169.

[2] Office of Dietary Supplements, National Institutes of Health, Biotin Fact Sheet for Health Professionals.

[3] Linus Pauling Institute Micronutrient Information Center, Biotin.

[4] Scientific Opinion on the substantiation of health claims related to biotin and energy-yielding metabolism (ID 114, 117), macronutrient metabolism (ID 113, 114, 117), maintenance of skin and mucous membranes (ID 115), maintenance of hair (ID 118, 2876) and function of the nervous system (ID 116) pursuant to Article 13(1) of Regulation (EC) No 1924/2006.

[5] de Araújo, et al., Use of silicon for skin and hair care: an approach of chemical forms available and efficacy, An Bras Dermatol. 2016 May-Jun; 91(3): 331–335.

To see a list of our other references, please click here. 

CITATIONS

DISCLAIMER: This scientific research is for informational purposes only. The results reported may not necessarily occur in all individuals. Primal Harvest provides this information as a service but does not endorse it. This information should not be read to recommend or endorse any specific products.

When choosing a biotin supplement, many premium formulas include additional nutrients to nourish and protect your hair from the inside out. Supporting ingredients like collagen, keratin, vitamin C, and zinc work alongside biotin to provide comprehensive hair health support.

Top Biotin Supplements 2025

*Note: These statements are not intended to diagnose, treat, cure, or prevent any disease or condition. Always consult your physician for proper diagnosis and treatment.

• Not Third-Party Tested — Choose a hair supplement that has been independently third-party lab tested and manufactured in the USA to guarantee premium quality and safety.
• Titanium Dioxide — A food coloring agent widely used to whiten supplement capsules.*
• Artificial Flavors — Avoid hair supplements that contain artificial flavors. These products may contain ingredients such as high-fructose corn syrup, artificial sweeteners, and other unnecessary additives.

5. Viviscal Hair Growth

PROS

• Features biotin, vitamin C, and horsetail extract
• 2 tablet serving size 

CONS

• 30-day money-back guarantee
• Marine collagen complex not suitable for seafood allergies

BOTTOM LINE

Viviscal Hair Growth is a twice-daily tablet with ingredients like vitamin C, zinc, iron, biotin, and niacin. The price for a one-month supply is fair, and it features a wide range of essential vitamins and minerals. However, it is formulated with marine collagen which means it may not be suitable for everyone. You may also want to note that it only comes with a 30-day money-back guarantee.

C

GRADE

Top Biotin Supplements 2025

Key Ingredients

Try To Avoid

Important Criteria

Biotin

Zinc

Vitamin C

Vitamin B6

Vitamin B5

Horsetail Extract

Calcium

No Titanium Dioxide

Hair Skin Nails 

by Weem

Women's Hair Growth Nutraceutical

by Nutrafol

Clinical Formula

by Hair La Vie

Viviscal Hair Growth 

by Viviscal

90d Money-Back Guarantee

Third Party Tested

Subscribe & Save Program

Note: We try to update product information as often as we can. Please visit product websites for more information.

4. Hair Skin Nails

by Weem

PROS

• With biotin and zinc
• Gummy form
• Plant-based

CONS

• Contains Titanium Dioxide
• Doesn't include some key hair-supporting ingredients (zinc, vitamin B5, calcium)

BOTTOM LINE

Hair Skin Nails by Weem offers a plant-based, vegan-friendly approach to hair health in a convenient gummy format. While it contains some essential nutrients, plus biotin, the formula lacks several key hair-supporting ingredients found in higher-rated competitors. 

The presence of titanium dioxide may concern some consumers, and those wanting a more comprehensive hair health formula might prefer options with a fuller nutrient profile.

A

GRADE

2. Clinical Formula

by Hair La Vie

PROS

• Comprehensive 20-ingredient formula
• Made in USA with third-party testing
• Contains premium ingredients (collagen, saw palmetto)

CONS

• Higher price point (up to $59/bottle)
• 3-capsule serving size

BOTTOM LINE

Clinical Formula combines 20 hair-supporting ingredients, including biotin, vitamins, minerals, and premium additions like hydrolyzed collagen, saw palmetto, and a proprietary botanical blend with reishi mushroom and amla fruit. While the formula is third-party tested and manufactured in the USA under strict quality standards, the three-capsule serving size and higher price point ($44-59 per bottle) may not appeal to everyone. Despite its impressive ingredient list and manufacturing quality, some users might prefer a more streamlined, cost-effective option with a simpler dosing schedule.

B+

GRADE

• Biotin — Often used to support hair and nail health. Researchers believe that there is a link between biotin deficiency and hair health. This nutrient plays an important role in healthy cell formation and is essential for the healthy metabolization of fats, amino acids, and carbohydrates.* [3, 4]
• B-Vitamins — These essential vitamins help to carry out a number of processes in the body and are also important for supporting hair health.*
• Horsetail Extract (Silica) — This extract is a natural source of silica, a mineral composed of silicon and oxygen, which is important for healthy collagen. Research suggests that horsetail extract may support hair strength and shine, as well as scalp health.* [5] 
• Vitamin C — This antioxidant-rich vitamin possesses numerous benefits for healthy hair. It is used by the body to protect against oxidative stress, support skin (and scalp) health, and is also needed to create collagen. Vitamin C helps the body absorb iron, an important mineral for hair health and overall wellness.*
• Zinc — Zinc is a trace mineral that is important for maintaining hair and scalp health.* 
• Keratin — This is the main type of protein found in hair which is responsible for the strength and elasticity of hair and is essential for maintaining healthy hair.* 
• Collagen — Collagen is the most abundant protein in the human body and is key for maintaining skin and scalp health.* 

The National Institutes of Health indicates that insufficient biotin intake may be linked to changes in hair growth, skin health, and nail strength. That's why maintaining adequate biotin levels is important for those looking to support these areas of health. [2]