Biotin vs. Keratin Peptides for Hair Growth: 8 Facts Derms Want You to Know

When you’re in the market for a hair growth product, the sheer number of options can be dizzying. So many promises, so many ingredients—it’s easy to feel overwhelmed. Still, there are two specific ingredients that tend to show up again and again: keratin peptides and biotin.

What’s the difference? Biotin is often promoted for strengthening hair and nails and is frequently mentioned in the context of biotin for hair growth. Keratin peptides, on the other hand, are structural proteins that form the building blocks of hair. These peptides are found in formulations like OMI hair growth peptides that contain Intermediate Filament Peptides (IFP), which provide bioavailable keratin fragments that the body can use directly.

If you’re goal is to build better, healthier hair, wondering whether to choose between biotin or keratin for hair is a common question. Both are believed to improve the look, feel, and growth of hair. However, choosing the right one depends on your goals, biology, and the balance of your diet.

Here, we explore the healthy hair biology behind biotin and keratin peptides, and include insights from leading dermatologist Dr. Antonella Tosti, Professor at the University of Miami, to help you make an informed decision with balanced, evidence-based guidance.

1) Fact: Biotin is a B Vitamin

Biotin, also known as Vitamin B7, is a water-soluble nutrient that plays an important role in metabolizing fats, carbohydrates, and proteins. It supports enzymes called carboxylases, which assist in essential metabolic processes and contribute to the health of the skin, nerves, and keratin structure.

Biotin has become a popular ingredient in beauty supplements, however Dr. Tosti notes that while it's essential for protein synthesis, true biotin deficiency symptoms are rare except in specific medical or congenital conditions.

Research shows that up to 40 percent of individuals with hair loss may have marginal biotin levels and can benefit from supplementation. For most people without a deficiency, however, excessive biotin does not provide additional hair growth benefits.

Research shows that up to 40 percent of individuals with hair loss may have marginal biotin levels and can benefit from supplementation. For most people without a deficiency, however, excessive biotin does not provide additional hair growth benefits and may increase concern about biotin side effects.

2) Fact: Most People Get Enough in Their Diet

That’s because the vitamin is naturally found in foods such as egg yolks, fish, meat, seeds, nuts, sweet potatoes, and organ meats including liver and kidneys. Because biotin is so widely available and efficiently recycled by the body, deficiency is uncommon.

Adults generally require about 30 micrograms of biotin per day, an amount easily achieved through a balanced diet. However, certain factors, including chronic alcohol use, the regular consumption of raw egg whites, and the use of anti-seizure medications, can interfere with absorption and increase the risk of deficiency.

When biotin levels are too low, symptoms may include thinning hair, brittle nails, fatigue, and rashes around the eyes, nose, or mouth. For healthy adults, however, taking large doses of biotin is unnecessary and has limited scientific support for improving hair growth compared to more targeted options such as hair growth peptides or a peptide complex for hair.

3) Fact: There’s Limited Research About Biotin

Despite its popularity, there is limited scientific evidence that biotin significantly improves hair growth in individuals who are not deficient. Small studies suggest possible improvements in nail strength and structure, and anecdotal reports describe better hair texture among people with low biotin levels. However, well-controlled clinical trials in healthy populations are lacking.

Biotin is beneficial when the body needs it, but it does not act as a universal solution for hair concerns. Once the body has sufficient biotin, additional supplementation does not enhance keratin production or hair growth, which is why many experts recommend broader support through hair nutrition supplements. Drug-free hair growth options like a balanced diet and proper sleep cycles are well documented ways to improve hair health.

4) Fact: Keratin Peptides Deliver Direct Follicle Support

Keratin peptides work differently from biotin. Rather than supporting keratin synthesis indirectly, these peptides deliver the building blocks of keratin directly to the body. As Dr. Ava Shamban recently discussed in the Glamour article “7 Best Hair Growth Gummies, According to Dermatologists”, OMI offers a “unique focus on supporting collagen IV production, a type of protein that is essential for hair strength, to help anchor hair at the root, preventing it from breaking and shedding.”

The clinically studied form of these peptides, known as Intermediate Filament Peptides (IFP), is the active component in OMI Hair Growth Peptides. These peptides are derived through a patented process from New Zealand Strongwool and are designed to reinforce the structure of the hair and strengthen follicle anchoring.

According to Dr. Tosti, OMI’s keratin peptides contribute to hair cortex integrity by securing the follicle more firmly to the scalp and stimulate the production of Collagen IV, a specialized collagen that enhances the follicle’s grip on the scalp. They also provide antioxidant protection, which helps reduce inflammation caused by ultraviolet light, pollution, and scalp microbiome imbalance. This combination of structural support and scalp protection creates an optimal environment for hair growth while supporting overall hair follicle health.

5) Fact: Clinical Studies on Keratin Peptides Show Significant Growth

In double-blind, placebo-controlled studies, participants who took IFP Hair Growth Peptides for 90 days experienced less hair shedding and stronger, shinier hair. They also reported improvements in nail strength and skin hydration. Importantly, the peptides were well tolerated, and no significant side effects were observed.

Dr. Tosti notes that these benefits were observed across all hair types. The results suggest that combining keratin peptides with supportive vitamins and nutrients can promote not only hair growth but also overall strand quality, making them a strong contender for the best supplement for hair growth. These results exceed what single-nutrient options like biotin alone can often achieve and underscore the importance of collagen for hair growth and multi-pathway hair nutrition supplements.

6) Fact: OMI Peptides are Synergistically Formulated

The efficacy of OMI’s formula is based on how its key ingredients work together. Niacinamide, a form of Vitamin B3, enhances scalp circulation and supports scalp health by delivering oxygen and nutrients to the follicles. Zinc and copper support pigment and hair follicle health while maintaining balance, preventing one mineral from inhibiting the absorption of the other.

Pantothenic acid, also known as Vitamin B5, stimulates the proliferation of dermal papilla cells, which are responsible for initiating hair growth and contribute to healthy hair biology. Pyridoxine, or Vitamin B6, provides anti-inflammatory and antioxidant effects, while Vitamin C assists with collagen synthesis and strengthens the hair follicle’s structure, supporting hair cortex integrity and overall hair nutrition supplements effectiveness.

7) Fact: Biotin Could Indirectly Lead to Acne Breakouts

Although biotin is safe for most people, very high doses can interfere with the absorption of Vitamin B5, which is why discussing biotin side effects is essential. Because Vitamin B5 helps regulate oil production and maintain a healthy skin barrier, this interference may contribute to breakouts. Keratin peptides do not disrupt other nutrients, making them a better choice when comparing biotin vs keratin for individuals with sensitive or acne-prone skin.

8) Fact: Biotin Can Support Hair Growth if You’re Deficient; Keratin Peptides Offer More Direct Support

Biotin and keratin peptides both contribute to healthy hair, but their effectiveness depends on individual factors. Biotin can be helpful for people with a documented deficiency or those with medical conditions that deplete B-vitamins, especially when biotin deficiency symptoms are present. This is why some people consider biotin for hair growth or explore biotin or keratin for hair when choosing supplements.

For individuals seeking visible improvement in hair density, strength, and shine, keratin peptides and hair growth peptides offer a more direct and scientifically supported option.

Dr. Tosti emphasizes that OMI’s keratin peptides are suitable for all hair types and can produce noticeable results within a few months. By strengthening the scalp-follicle connection, improving collagen support, and providing essential amino acids, these peptides help the body maintain healthy and resilient hair. OMI is suitable for all hair types and can produce noticeable results within a few months, she notes. By strengthening the scalp-follicle connection and providing essential amino acids, these peptides can help keep hair healthy and resilient.

The Takeaway

Healthy hair begins beneath the surface. While biotin supports basic metabolic processes, OMI Hair Growth Peptides combine clinical science with modern peptide technology to reinforce hair at its foundation.

As Dr. Tosti explains, “I prefer products that contain keratin-derived peptides, antioxidants, and biotin in balanced proportions, because they provide the amino acids and protection that hair truly needs.” Dr. Shamban adds that “anyone who has thin, damaged, easily broken hair or less than optimal growth can benefit.”

With consistent use and the right balance of nutrients, it’s possible to strengthen the scalp, support the follicles, and achieve visibly healthier, stronger, and more radiant hair, an outcome supported by a modern understanding of healthy hair biology.

Frequently Asked Questions

Can biotin help my hair grow faster?

Biotin can support hair health if you have a deficiency, but it does not significantly improve growth in those with normal biotin levels.

How are keratin peptides different from biotin?

Keratin peptides provide the actual building blocks of hair, while biotin supports the body’s ability to produce keratin.

How long does it take to see results from Hair Growth Peptides?

Most people begin noticing reduced shedding and stronger hair within about 90 days.

Are keratin peptides safe for all hair types?

Yes, clinical research and expert dermatological review show that keratin peptides are well tolerated and effective across all hair types.

Can keratin peptides improve skin and nails too?

Yes, keratin peptides have been shown to enhance nail strength and improve skin hydration and smoothness.