Text panel showing ‘Developed by Dr. James Kilgour, a Stanford-trained dermatologist’ with his portrait and founder quote
Infographic showing clinical trial results: 95% improved by week 6; 60.3% fewer hairs shed; 53% significant growth; 43-woman trial
Hand holding the black Treatment scalp serum next to the white Prevention serum on a blue tiled surface; overlay text We’re confident you’ll love your results
Front view of KilgourMD Prevention Serum bottle showcasing pump dispenser and label with blurred sink and testimonial overlay
Graphic titled Pure, Plant-based Ingredients showing The Treatment Scalp Serum and botanicals like saw palmetto and caffeine
Close-up scalp before-and-after showing increased hair density, left labeled D90 and right labeled D120
Top-down comparison of a thinning scalp showing increased hair density from D90 to D120 after treatment
Instructional graphic showing 'How to Use': Step 1 fill dropper (press button, release to draw serum); Step 2 apply and massage onto scalp
The Science

The KilgourMD Dual Action System is backed by over 40 published clinical and laboratory studies – making it the most scientifically-validated natural formula on the market.

Clinical Results

The KilgourMD system combines Redensyl®, Capixyl®, and Procapil®—ingredients that have been evaluated in a published, peer-reviewed clinical trial reporting improvements across multiple hair-related outcomes, including physician assessments. In our 2026 trial, the serums were well tolerated, with no adverse effects reported.

How to Use
  1. Start with a clean scalp
    Apply to a dry or lightly damp scalp. These formulas are designed to absorb into the scalp, not coat the hair.
  2. One dropper daily
    Use one full dropper (about 1 mL) per day. If the dropper fills halfway, use a second to reach 1 mL. Consistency matters most. Apply all at once or split between morning and evening.
  3. Apply, massage, and leave in
    Part the hair and apply directly to thinning or shedding areas. Massage gently for 30–60 seconds. Do not rinse. Let it absorb and style as usual.
  4. Stay consistent
    Use daily. If you miss a day, simply resume—no need to double up.

View full application guide

The Treatment Scalp Serum | Hair Growth Serum for Thinning Hair | KilgourMD

  • Decrease visible hair fall DECREASE VISIBLE
    HAIR FALL
  • Reverse lost fullness REVERSE LOST
    FULLNESS
  • Prevent premature scalp aging PREVENT
    PREMATURE SCALP
    AGING
Woman smiling and looking into a tabletop mirror in a bright, calm bathroom
KEY INGREDIENTS
What goes into The Treatment Serum

Redensyl® | stimulate + reactivate

In laboratory (in vitro) studies, Redensyl-treated follicles showed a 200% increase in thickness, compared to untreated follicles. This patented complex features a unique combination of molecules that help support the look of thicker, denser hair over time, especially in areas where hair may appear visibly thinner. By helping maintain a balanced, well-cared-for scalp environment, it supports hair that looks fuller, stronger, and more vibrant—without irritation.

Saw Palmetto | shield + reverse

A well-established, natural suppressor of 5α reductase—the enzyme that converts testosterone into DHT, the main driver of follicle miniaturization. Clinical reviews have shown that Saw Palmetto can reduce androgen receptor activity in the scalp by 50%, and it is linked to reduced hair shedding and increased hair thickness without systemic side effects.

Rosemary | soothe + nourish

Rosemary extract has demonstrated strong scalp-soothing and antioxidant effects, particularly beneficial for scalp health. A 2020 review highlighted that rosemary improves local scalp circulation, soothes irritation, and may be as effective as leading hair loss alternatives in improving hair count. Its use has been associated with reduced scalp itchiness, decreased visible flakes, and improved follicular environment.

Ginseng | stimulate + calm

Contains ginsenosides, bioactive compounds known to stimulate hair follicles, promote proliferation, and reduce surface inflammation. A 2020 review outlined its use in herbal hair loss treatments, citing improved follicular strength, hair shaft thickness, and overall scalp health. Ginseng also supports microcirculatory flow locally in the scalp, enhancing nutrient delivery while calming stress responses tied to thinning and flaking.

Amla | shield + rejuvenate

Rich in antioxidants and vitamin C, offering significant protective and regenerative benefits for the scalp. A 2020 clinical study evaluated a hair serum containing amla over 90 days. Results showed a notable increase in hair growth rate, density, and reduced hair fall. The serum was well tolerated, with no adverse events, and demonstrated strong support for healthier, more resilient hair. Amla's high antioxidant content helps counter oxidative stress at the local follicular level, preserving hair integrity and supporting rejuvenation.

Pumpkin Seed | shield + nourish

Contains phytosterols, zinc, and omega fatty acids that naturally supress 5α reductase, the enzyme responsible for converting testosterone to DHT. A 2014 study demonstrated a 40% increase in hair count and 30% improvement in hair thickness after 24 weeks of use. The extract also provides essential minerals that support keratin production, while its scalp anti-inflammatory properties help maintain optimal pH and reduce environmental oxidative stress linked to follicle miniaturization.

Caffeine | awaken + stimulate

Penetrates around the hair follicles following topical application, where it supresses DHT effects and supports cellular metabolism. This powerful ingredient extends the anagen (growth) phase by 37% and increases hair shaft elongation by 46%. It enhances local ATP production in follicular cells, counteracts testosterone-induced follicle suppression, and improves barrier function. Unlike systemic caffeine intake, topical application delivers therapeutic doses locally to follicles without side effects.

Pine Bark | neutralize + protect

A potent antioxidant and scalp anti-inflammatory compound shown to support microcirculation and neutralize free radicals in scalp tissue. It helps protect follicular DNA from oxidative damage, which is especially relevant during menopause when antioxidant production declines. Pine Bark (notably as Pycnogenol®) has shown strong antioxidant effects in skin studies and is commonly used to reduce oxidative aging and scalp inflammation—both of which are known contributors to follicle aging and hair loss.

Turmeric | soothe + calm

Turmeric's active compound, curcumin, is a potent natural scalp anti-inflammatory shown to suppress 5α reductase and local inflammatory cytokines. In hair loss contexts, it has been studied for its role in soothing scalp inflammation, balancing microbiota, and reducing oxidative stress. A 2020 systematic review emphasised turmeric's ability to address local hormonal and inflammatory triggers of alopecia while enhancing follicle resilience in stressed scalps.

  • 0 %

    Saw results by week 6

    (clinical trial comprised of 43 women ages 30-65)

  • 0 %

    Fewer hairs shed in Combing Test

    (Day 120 vs. baseline)

  • 0 %

    Showed clinically significant growth

    (Day 120, expert assessment)

THE PROCESS
How to Grow

We intentionally designed our serums to work perfectly together, as well as with your lifestyle. For optimal results though, here are some tips from us.

Close-up of hand applying hair serum with dropper to a parted scalp
STEP 01
Start with a clean scalp

Apply to a dry or lightly damp scalp. These formulas are designed to absorb into the scalp, not coat the hair.

Hand holding two Kilgour md scalp serum bottles showing Prevention and Treatment labels against a light blue background
STEP 02
One dropper daily

Use one full dropper (about 1 mL) of each serum per day. If the dropper fills halfway, use a second to reach 1mL. Consistency matters most. Apply all at once or split between morning and evening.

Person parting scalp with fingers to apply hair serum, close up on thinning hair
STEP 03
Apply, massage, and leave in

Part the hair and apply directly to thinning or shedding areas. Massage gently for 30-60 seconds. Do not rinse. Let it absorb and style as usual.

Close-up of hand applying hair serum with dropper to a parted scalp
STEP 04
Stay consistent

Use daily. If you miss a day, simply resume, no need to double up.

FREQUENTLY ASKED QUESTION
Have a question? We are here to help.

What's the optimal way to use the Treatment serum for best results?

The most important factor in seeing results from the serum is consistent, daily use. The optimal routine is whichever approach fits most naturally into your day and allows you to use it consistently — whether you apply morning or evening, or whether you apply on wet or dry hair or before styling.

The key is giving the product enough time to absorb properly. In our clinical studies, we allowed the products to absorb for approximately 12 hours, so we recommend avoiding showering or washing the treated area during that time.

My dropper only dispenses half a serum's worth.  How much should I actually be using?

The ideal dose is a full dropper which is approximately 1 mL. If the dropper does not fill all the way, repeat to make a full dropper. 

If your current dropper is difficult to measure, you can also use a different applicator, such as a generic minoxidil applicator purchased online, as long as it allows you to accurately measure 1 mL.

Your ideal amount may vary slightly depending on your hair density. Finer hair may require less product, while thicker hair may require more to adequately cover the scalp.

What is the difference between the Prevention and Treatment serums?

The Treatment and Prevention serums were formulated by Dr. Kilgour to work together as a dual-action system. Because they target different aspects of the hair-thinning process, using both consistently is expected to provide the strongest overall results.

  • Prevention Serum: Focuses on creating a healthier scalp environment by supporting scalp balance, reducing inflammation and oxidative stress, and helping minimize shedding.
  • Treatment Serum: Focuses more on supporting follicle activity and improving the appearance of hair density and fullness in areas that are already thinning.

For the most comprehensive approach, we recommend using both serums together rather than relying on just one. Shop the bundle here.

What's the best technique for applying serum to get full scalp coverage if I have super fine or thick hair?

The recommended amount for each serum is 1 mL per day. However, depending on your hair type and density, you may need slightly more to ensure the serum reaches and covers your entire scalp.

For fine or thin hair, 1 mL may be enough to provide full scalp coverage. With thicker or denser hair, more hair sits between the serum and your scalp, so you may need to use additional product to make sure it reaches the areas you’re targeting.

For the best coverage, part your hair into sections and apply the serum directly to the scalp, rather than applying it primarily to the hair. This helps ensure the product reaches the scalp where it’s intended to work.

How is KilgourMD different from regular hair growth products? Is it worth it?

KilgourMD stands out from other brands by formulating with clinically studied ingredients like Redensyl®, Capixyl®, and Procapil® at their proven effective dosages and in higher concentrations of active ingredients overall — while many other brands include only trace amounts for label appeal rather than real results.

 What is your return policy?

While visual improvements typically take 3–6 months of consistent use, many people feel less scalp irritation and a healthier-feeling scalp within the first weeks of use!

We’re so  confident you’ll love your results, we offer a 90-day, no-questions-asked refund, backed by our full refund policy.

Refunds are subject to our full refund policy.

TESTIMONIALS

Hear what the people have to say

4.1
Rated 4.1 out of 5 stars
Based on 58 reviews
74%would recommend these products
Slide 1 selected
Customers Talked About
58 reviews
  • M
    Maureen
    2 days ago
    Reviewing
    The Treatment Scalp Serum 3 Pack
    Rated 5 out of 5 stars
    5 Stars

    So far the results are good.

  • B
    Beth
    1 week ago
    Reviewing
    The Treatment Scalp Serum 3 Pack
    Rated 1 out of 5 stars
    1 Star

    Canceled this on me and still charged me for it. Do not buy anything from this website.

  • C
    Carol
    1 week ago
    Reviewing
    The Treatment Scalp Serum 3 Pack
    Rated 3 out of 5 stars
    3 Stars

    Im using presently but less than a week. I haven’t noticed anything yet.

  • L
    Lynn
    2 weeks ago
    Reviewing
    The Treatment Scalp Serum 3 Pack
    Rated 5 out of 5 stars
    5 Stars

    Just started using this today. Wanted to give the shampoo/conditioner a few days to work first. Seems nice after 1 day. Didn't make my hair sticky so that's cool

  • A
    Arlene
    3 weeks ago
    Reviewing
    The Treatment Scalp Serum
    Rated 5 out of 5 stars
    5 Stars

    I like the ease of use and the fact that it s light and it doesnt smell.