Hair Growth Serums: What Works and What Doesn't

The first signs of hair thinning or shedding might send you straight to the hair aisle, in search of something that can help — like a hair growth serum. Hair growth serums are applied topically, directly to your scalp, which makes them distinct from other products designed to make your hair smoother and fuller. Some serums help nourish your scalp’s surface, for example, while others aim to support your hair follicles themselves.

From social media trends and influencers to dermatologist-recommended routines, these products have gained traction as an easy addition to everyday hair care. With so many options available, though, it can be difficult to choose.

Here’s what to know about hair growth serums and how to find the right formula for your needs.

What Are Hair Growth Serums?

Hair growth serums are leave-in treatments formulated with concentrated ingredients designed to support the appearance and health of hair. Unlike shampoos or conditioners, which are rinsed away, serums are typically applied directly to the scalp and left in place to allow active ingredients more time to interact with the scalp and hair follicles.

Depending on the formula, hair growth serums may focus on different areas of hair health, including:

• Supporting a healthy scalp environment
• Nourishing hair follicles
• Supporting the natural hair growth cycle
• Helping improve the appearance of hair density and fullness
• Strengthening the look and feel of individual strands

It’s important to know that not all hair growth serums work the same way, and a product’s true effectiveness depends largely on its ingredients and formulation. Hair growth serums also differ from oral hair growth formulas. All topical products are applied externally to target the scalp, while oral formulas work from within by delivering ingredients throughout the body.

How Do Hair Growth Serums Work?

Though every product may vary, hair growth serums typically support the hair growth cycle, nourish the scalp environment, and strengthen hair structure.

Supporting the Hair Growth Cycle

A healthy hair cycle depends on many factors, including genetics, hormones, nutrition, and stress levels. Hair growth products are designed to support the biological processes that maintain healthy-looking hair rather than instantly creating new growth.

To understand how serums support this process, it is helpful to understand the hair growth cycle. Each strand of hair moves through three key phases:

• The first is the anagen phase, when active hair growth occurs. During this stage, cells within the hair follicle are actively producing new hair fibers.

• The second is the catagen phase. This is a short transitional period when the hair follicle begins preparing for the resting stage.

• The third is the telogen phase, which is when the follicle rests before releasing the strand and beginning a new growth cycle.

Supporting the Scalp Environment

A healthy scalp provides the foundation for stronger-looking hair. Many hair serums include ingredients like caffeine, peptides, and botanical extracts that are intended to support scalp hydration, nourishment, and overall wellness. Since hair follicles are located within the scalp, nourishing a balanced environment can help maintain the conditions needed for healthy, resilient strands.

Supporting Stronger Hair Structure

Hair is primarily made of keratin, a structural protein responsible for much of its strength. Keratin production is an important area of research in hair science because stronger keratin structures can contribute to healthier-looking hair.

This is one area where peptide technology has drawn significant interest. Certain peptides act as signaling molecules that help encourage important biological processes involved in hair health. For example, GHK-Cu has been studied for its ability to signal dermal papilla cells, which are the cells that help regulate your hair growth cycle.

What Are Some Hair Growth Serum Ingredients Backed by Research?

When evaluating a hair growth product, ingredients matter. The most promising formulas typically contain active ingredients that have been studied for their role in supporting hair wellness.

Peptides

Peptides are short chains of amino acids that play important roles throughout the body and have become a focal point in hair care research because of their ability to help signal biological processes involved in maintaining healthy hair. By activating the body’s natural keratin production pathways, peptide technology offers a targeted approach to supporting a healthy hair-growth ecosystem.

Minoxidil

Minoxidil is one of the most widely researched ingredients for hair growth. Unlike many cosmetic hair care ingredients, minoxidil is an FDA-approved topical treatment used for certain types of hair loss . Research has shown that it can support hair regrowth in certain individuals, particularly those experiencing hereditary hair thinning. Like many hair growth solutions, consistency is essential for maintaining results.

Caffeine

Caffeine is another ingredient frequently found in hair growth formulas like serums. Some research suggests caffeine may help support the scalp environment by penetrating hair follicles to stimulate growth and improve blood circulation. While caffeine may help encourage healthy-looking hair growth, results depend on the specific formulation and the source of the ingredient.

Botanical Extracts

Many hair growth products, like serums, include botanical ingredients such as plant extracts (like rosemary extract) and antioxidants (like vitamin E). These plant-based nutrients are often selected to help stimulate the scalp and neutralize free radicals , which are highly unstable molecules that can damage hair shafts and follicles.

While some botanicals have displayed the promising ability to support scalp health and hydration, the evidence varies widely depending on the specific ingredient and formulation.

Are Hair Growth Serums Enough To Improve Hair Health?

Hair growth serums can be a helpful part of a hair care routine, but they’re only one part of supporting your hair health. Hair health is influenced by a combination of both external and internal factors. Things like genetics, hormones, stress, and nutrition can all affect how your hair looks and feels over time. As a result, many people are moving towards a more comprehensive approach that supports hair from multiple angles.

Topical products focus on the scalp and hair strands, while oral formulas provide nutrients and active ingredients throughout the body. Since hair follicles rely on internal biological processes to produce strong strands, supporting those processes from within is an important area of hair science.

For many people, using a topical serum alongside an oral supplement can be a more effective way to support their overall hair goals.

How OMI Hair Growth Peptides Support Healthy Hair From Within

OMI takes a science-first approach to hair wellness by focusing on what happens beneath the surface. Rather than topical application, our oral Hair Growth Peptides are designed to support healthy hair growth from within using patented peptide technology.

At the center of our formula is IFP-131™ Hair Growth Peptides , our patented keratin peptide breakthrough. IFP-131™ is a patented keratin peptide clinically studied to restore peptides at the follicle, helping anchor hair to the scalp, extend hair's natural growth phase, and strengthen every fiber from within.

Our IFP-131™ Hair Growth Peptides are designed without fillers and unnecessary ingredients, and they’re third-party tested and are 100% drug and hormone-free. In a 90-day placebo-controlled study, our peptides were found to be 3x more potent than other keratin sources and to support up to 10% more hairs in the growth phase.

The Takeaway

When it comes to hair growth, science matters. While no single serum works the same for everyone, the most effective approach will always involve research-backed products and consistent use.

Hair growth serums deliver active ingredients such as peptides, minoxidil, caffeine, and botanical extracts to the scalp to nourish hair follicles, support the natural growth cycle, improve the appearance of fullness, strengthen the feel of strands, and support the scalp environment.

For those in search of an innovative approach to hair wellness, OMI Hair Growth Peptides offer an innovative way to support healthier-looking hair from within. Many people combine topical and oral approaches to form a well-rounded routine.

Frequently Asked Questions

Do hair growth serums actually work?

Hair growth serums can help support healthier-looking hair when they contain researched ingredients and are used consistently. Results vary, depending on the formula, individual hair concerns, and the underlying cause of thinning or shedding. 

How long does it take for hair growth products to work?

Hair grows in cycles, so most hair growth products require consistent use for several months before noticeable changes appear. Many people begin evaluating results after 3 to 6 months of regular use.

What ingredients should I look for in a hair growth product?

Look for science-backed ingredients such as peptides, minoxidil, caffeine, and researched botanical extract. Ingredients like keratin peptides are an emerging area of hair science that support the natural processes involved in producing stronger-looking hair. 

Are oral hair growth products better than hair growth serums?

Oral and topical hair growth products work differently, and one approach isn’t necessarily better for everyone. Topical serums are directly applied to the scalp while oral formulas like OMI Hair Growth Peptides support healthy hair from within. 

Can you use a hair serum and an oral hair growth supplement together?

Yes, many people combine topical and oral approaches. Using both can help support hair health from multiple angles, with topical products targeting the scalp and oral formulas supporting the internal processes involved in healthy hair growth.

What is IFP-131™?

IFP-131™ is OMI’s patented hair growth peptide clinically studied to support peptide production at the follicle to help anchor hair to the scalp, extend hair’s natural growth phase, and strengthen every fiber from within.