Peptides for Hair Growth: Benefits, How They Work & Side Effects

Peptides are short chains of amino acids, which are smaller, more easily absorbed fragments of proteins. They simply act as signaling molecules, which interact directly with the hair follicles and scalp. By binding to receptors on cells, they inform the cells to enter or prolong the growth phase of the hair cycle, boost the production of vital structural proteins such as keratin and collagen and improve the overall health of the scalp.

Here are the expert-approved benefits of peptides for haircare:

• Boost Hair Growth:

Certain peptides keep hair follicles in the active growth (anagen) phase longer, which boosts new growth and improves overall density of your hair.

• Support Hair Structure:

By signaling the production of keratin, the primary protein in hair, peptides fortify the hair strands, making them thicker, stronger, and less likely to break.

• Improve Scalp Health:

Peptides have anti-inflammatory and antioxidant properties, which soothe the scalp, minimise irritation, and craft a healthy environment for follicles.

• Increase Nutrient Delivery:

They enhance blood circulation to the scalp, ensuring hair follicles receive essential oxygen and nutrients needed for better functioning.

Peptides work on the hair follicle at a cellular level through two primary mechanisms:

• Cellular Signaling: They act as communicators with the dermal papilla cells within the follicle. For instance, some peptides signal these cells to ramp up the production of growth factors that are important for initiating and maintaining the anagen phase.
• Enhancing Environment and Structure: Copper Peptides (GHK-Cu): These peptides increase blood vessel formation, bringing more nutrients to the follicle, and they have anti-inflammatory effects that protect the follicle from damage.
• Keratin Peptides: These peptides provide direct amino acid building blocks, which integrate into and repair the hair, resulting in immediate improvement in strength and radiance.

"Peptides are short chains of amino acids that act as messengers to stimulate hair follicles and strengthen strands. In modern haircare, peptides like Copper Peptides have shown remarkable results in improving hair density and reducing breakage. Copper Peptides enhance scalp circulation and repair follicular damage," remarks Dr Bindu Sthalekar, celebrity trichologist and founder of Skin Smart Solutions. "They essentially signal your follicles to 'stay active' longer, leading to thicker, fuller hair over time. The best part is that peptides are gentle, making them suitable for long-term use with minimal irritation."

Here are the best ways to incorporate peptides in your haircare routine:

• Pick the Right Topical Formulation:

Peptides are most effective in products that have direct contact with the scalp, such as serums, tonics, or leave-in treatments.

• Apply Directly to the Scalp:

Serums should be massaged slowly into a clean scalp to ensure maximum absorption by the hair follicles. Shampoos and conditioners consisting of peptides have limited contact time, making them less impactful for growth but still beneficial for hair health.

• Consistent Use:

Peptides work by continuously signaling to the cells, so applying them every day, or as directed by the product, is crucial for seeing results.

• Consume Orally:

Alternatively, you could also consume peptides orally through supplements. "Peptides can be used in two ways—topically in serums or scalp treatments to boost hair growth, and orally through supplements like collagen, which is my preferred source," mentions Nyela Kapadia, health expert and co-founder of Intermittent Fasting Mindful Living. "Collagen peptides work from within to support not just hair, but also skin, nails, and even joint recovery. Since collagen is the most abundant protein in the body, supplementing it helps maintain strength and elasticity across the board, giving your hair a healthier base to grow from."

Peptides are usually well-tolerated and are considered safer than many traditional hair growth medications, but some precautions should always be taken, such as:

• Mild Scalp Irritation:

Some people could experience temporary redness, itching, or mild irritation, particularly when first starting a topical product with peptides.

• Allergic Reactions:

Though very rare, an allergic reaction to a specific peptide or a formula's carrier ingredients is always possible. Therefore, it's best to perform a patch test before applying it on your full scalp.

• Temporary Shedding:

In some instances, the follicle cycle resets, resulting in a temporary increase in shedding. This is typically a sign that the product is working and is usually followed by new growth.

A popular product that features peptides is The Ordinary Multi-Peptide Serum for Hair Density. Peptides offer a powerful, targeted approach to hair health, working as messengers to boost growth, strengthen the hair, and improve the overall health of the scalp. While they are not a certain fix for severe hair loss, they are a great tool for those hoping for thicker, fuller, and healthier hair. However, if you are pregnant, breastfeeding, or have any underlying medical conditions causing hair loss, it's advisable to speak to a dermatologist or healthcare provider before beginning any new haircare treatments.