4.6

Rated 4.6 out of 5 stars

4.6 | 63 reviews

Re:GRO Anti-Thinning Scalp Serum

Name: Re:GRO Anti-Thinning Scalp Serum
Brand: California Naturals
Price: 19.99 USD
Availability: InStock
Rating: 4.6 (63 reviews)

For Visibly Less Shedding, Stronger Strands, Fuller Hair* • 3.0 oz / 85 g

A clean, concentrated scalp serum clinically tested* to reduce breakage and support fuller, stronger-looking hair—without harsh or mystery chemicals.

Supports stronger, fuller-looking hair*

Energizes follicles and reduces breakage

Nourishes scalp for healthier-looking hair

Re:GRO Anti-Thinning Scalp Serum strengthens hair from root to tip while helping visibly improve fullness and reduce shedding over time. The lightweight formula stimulates the scalp and delivers an instant root-lifting effect for thicker-looking hair, without buildup or irritation.

Powered by 5% Capixyl®, caffeine, biotin, rosemary, and saw palmetto, this targeted treatment supports healthier strands and a more balanced scalp. Designed for thinning hair, early signs of hair loss, breakage-prone strands, and stressed scalps—including postpartum or tension-related shedding. Safe for color-treated and chemically treated hair, as well as extensions.

*Clinically tested: 97% saw less breakage and stronger strands with continuous use. Based on a 90-day third-party clinical study using Re:GRO Scalp Serum, Shampoo, and Conditioner.

• 5% Capixyl® – Clinically shown to spark new growth and strengthen thinning hair.
• Caffeine – Like coffee for your scalp—wakes up follicles and boosts circulation.
• Biotin – Strengthens strands and reduces brittleness for healthier hair.
• Botanical Oils – Rosemary, Castor, and Pumpkin Seed nourish the scalp and promote fullness.
• Saw Palmetto – Helps block DHT (shedding hormone) to keep hair stronger, longer.
• Silica (from rice) - Helps to lift roots and give you an instant thickness boost

Aqua/Water/Eau, Capixyl™, Aloe Barbadensis Leaf Juice, Panthenol (Vitamin B5), Biotin, Caffeine, Rosmarinus Officinalis (Rosemary) Leaf Oil1, Adenosine, PhytoCellTec™, Cucurbita Pepo (Pumpkin) Seed Oil, Serenoa Serrulata Fruit Extract, Malus Domestica Fruit Cell Culture Extract, 1, 2-Hexanediol, Caprylyl Glycol, Xanthan Gum, Sodium Benzoate, Ricinus Communis (Castor) Seed Oil, Silica, Ethylhexylglycerin, Caprylyl/Capryl Glucoside, Carbomer

SEE ALL SEE LESS

Fragrance Free. Our clean formula may have a subtle scent from naturally derived, food-grade ingredients. Vegan and cruelty-free, with zero junk - no parabens, phthalates, preservatives, or synthetic fragrance and dyes. Just smells you’d actually find in nature.

After cleansing with Re:GRO™ Anti-Thinning Shampoo & Conditioner, towel dry. Apply the serum directly to your scalp using the applicator in even lines, front to back or side to side. Massage with fingertips to cover the scalp. Glides on easy with a breezy, cooling finish—no rinse needed. Use 4x per week for 12 weeks for best results.

Enjoy free shipping on all orders over $40. Orders ship on business days, with 2 to 3 days for processing and 5 to 7 days for delivery.

We offer free returns within 30 days. Items must be unopened and in their original packaging.

Complete the Routine

Re:GRO Shampoo and Conditioner Set

Re:GRO Scalp Serum Trio

Before & After

Melanie before Re:GRO Anti-Thinning Scalp Serum versus after 12 weeks of use*

*Recommended for best results

Before

After

Frequently Asked Questions

Instantly: your scalp feels refreshed and energized, and hair looks lifted at the roots. Over time: with regular use 4x/week for 12 weeks, hair appears thicker, stronger, and more resilient, with reduced shedding and breakage.

This serum is great for thinning hair, weak or brittle strands, stress- or postpartum-related shedding, or tension from tight hairstyles like braids, buns, or ponytails. Perfect if you’re starting a scalp care routine and safe for color-treated, chemically treated hair, and extensions.*

*Consult your doctor if pregnant or breastfeeding.

It's the same formula. We made the best serum we possibly could and it works for everyone. We just offer it in men's and women's versions because that's how most people shop, but the actual product is identical. Same great results across the board!

Actually clean. Really natural. Totally transparent. This serum is 98% naturally derived and free from irritants, hormone disruptors, toxins, and synthetic fragrance.

Key ingredients like 5% Capixyl®, caffeine, biotin, saw palmetto, and botanical oils help nourish the scalp, support stronger follicles, reduce shedding, and give hair a fuller, healthier look over time. In a 90-day clinical study, 97% of participants reported less breakage and shedding.*

Yes! It works with any shampoo and conditioner, but for best results, we recommend pairing it with our Re:GRO™ Anti-Thinning Shampoo & Conditioner. Lightweight and non-sticky, it won’t weigh hair down and suits all hair types.

NO SYNTHETIC FRAGNANCE

FOR ALL HAIR TYPES

CRUELTY-FREE (LEAPING BUNNY CERTIFIED)

SULFATE, SILICONE, PARABEN, HORMONE DISRUPTOR & PHTHALATE FREE

98% CLEAN, NATURALLY DERIVED INGREDIENTS

MADE WITH RECYCLED PLASTIC

SAFE FOR COLOR TREATED HAIR

NATURALLY SCENTED

VEGAN

NO SYNTHETIC FRAGNANCE

FOR ALL HAIR TYPES

CRUELTY-FREE (LEAPING BUNNY CERTIFIED)

SULFATE, SILICONE, PARABEN, HORMONE DISRUPTOR & PHTHALATE FREE

98% CLEAN, NATURALLY DERIVED INGREDIENTS

MADE WITH RECYCLED PLASTIC

SAFE FOR COLOR TREATED HAIR

NATURALLY SCENTED

VEGAN

NO SYNTHETIC FRAGNANCE

FOR ALL HAIR TYPES

CRUELTY-FREE (LEAPING BUNNY CERTIFIED)

SULFATE, SILICONE, PARABEN, HORMONE DISRUPTOR & PHTHALATE FREE

98% CLEAN, NATURALLY DERIVED INGREDIENTS

MADE WITH RECYCLED PLASTIC

SAFE FOR COLOR TREATED HAIR

NATURALLY SCENTED

VEGAN

NO SYNTHETIC FRAGNANCE

FOR ALL HAIR TYPES

CRUELTY-FREE (LEAPING BUNNY CERTIFIED)

SULFATE, SILICONE, PARABEN, HORMONE DISRUPTOR & PHTHALATE FREE

98% CLEAN, NATURALLY DERIVED INGREDIENTS

MADE WITH RECYCLED PLASTIC

SAFE FOR COLOR TREATED HAIR

NATURALLY SCENTED

VEGAN

NO SYNTHETIC FRAGNANCE

FOR ALL HAIR TYPES

CRUELTY-FREE (LEAPING BUNNY CERTIFIED)

SULFATE, SILICONE, PARABEN, HORMONE DISRUPTOR & PHTHALATE FREE

98% CLEAN, NATURALLY DERIVED INGREDIENTS

MADE WITH RECYCLED PLASTIC

SAFE FOR COLOR TREATED HAIR

NATURALLY SCENTED

VEGAN

KIND WORDS

What they said

Switched from Native!

I had to restock with your brand because it's sooo good!! Switched from Native shampoo/cond and loving California Naturals!!

@LILYSLOCALE

CLASSIC CLEAN SHAMPOO & CONDITIONER

INSTAGRAM

Changed my hairline!

I've struggled with hair thinning & loss around my hairline, and using this a few times per week has completely changed the game for my hair growth around my hairline. It's thicker, and I've seen re-growth even in the bald spots! Having something affordable and effective is SO hard to find and this actually worked. Be sure to keep up with it and you will see results!

Olivia R.

deep repair hair mask

My hair drank them up!!

first time trying the California Naturals Super Moisture shampoo and conditioner. I’ve loved the body wash all summer and these are just as good. My hair drank them up!! I noticed a difference in the manageability and bounce, love the INCIs and the earthy fruity scent that’s so unique. Also these are SUPER affordable!!

@Dianamary126

Super Moisture Shampoo & Conditioner

INSTAGRAM

Changed my hairline!

I've been using this product for a few weeks now and I'm really happy with the results. It's made my hair look and feel healthier.

Olivia R.

deep repair hair mask

3 months ago

OBSESSED with these affordable gems

I am OBSESSED with these affordable gems from Target! These products have transformed my wash and go game. Anyone who asks about great natural hair care products, my answer is always California Naturals -10/10 recommend!

@chrissynatural_beauty

2-in-1 Shampoo & Body Wash

Instagram

Worked really well on my 4C hair

These California Naturals products smell so good and worked really well on my 4C hair, which is not always the case when I try new hair products. Felt really soft after using these. Safe to say it works for all hair types and it’s super affordable.

@kyrahthecreative

Classic Clean shampoo & conditioner

TIKTOK

IT'S ALL GOOD

We’re California Naturals.
Clean, natural, everyday essentials that actually work.

WOMEN FOUNDED & LED

SULFATE, PARABEN, & SILICONE FREE

PCR PLASTIC BOTTLES

for all hair types

MIXED & POURED IN CALIFORNIA

vegan & cruelty free

Learn more

4.6

Rated 4.6 out of 5 stars

Based on 63 reviews

Total 5 star reviews: 45 Total 4 star reviews: 15 Total 3 star reviews: 2 Total 2 star reviews: 0 Total 1 star reviews: 1

95%would recommend this product

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63 reviews

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L
LyssLyss52
Verified Buyer
3 months ago
Rated 5 out of 5 stars
Great growth serum for color treated hair! All natural!!
I always am weary of introducing new hair products since i dye my hair, but I do have breakage from the bleach. This serum is great! I use it when I do my slick backs, but it's not too sticky so you could use it on your cleaner hair days. I haven't seen too much growth yet as it's only been a few weeks, but I will continue to use it since it's so simple! I also have a friend who just finished chemo, and she's looking for clean products. Since this is all natural, she's also giving it a try!
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O
Olivia
8 months ago
Rated 5 out of 5 stars
Changed my hairline!!!
I've struggled with hair thinning & loss around my hairline, and using this a few times per week has completely changed the game for my hair growth around my hairline. It's thicker, and I've seen re-growth even in the bald spots! Having something affordable and effective is SO hard to find and this actually worked. Be sure to keep up with it and you will see results!
Featured
Was this helpful?
M
Mariela
2 weeks ago
Rated 5 out of 5 stars
5 Stars
I've only used it twice a already feel the difference in my hair! Feels healthier and thicker than before!! I'll leave another review when I've used it for a month.
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K
Kathy
1 month ago
Rated 5 out of 5 stars
5 Stars
I like the gel like consitencey. Its easy to apply to the scalp without getting it into the length of the hair. I just started using it so I can’t comment on if it works or not for hair loss but if it does I will be a user for life. It doesnt leave scalp oily or dry it out. Just clean feeling
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S
Sarah
2 months ago
Rated 5 out of 5 stars
5 Stars
Love these products!
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E
Elisa
2 months ago
Rated 5 out of 5 stars
5 Stars
I bought a bottle of this a few months ago and i feel like my hair has a lot of new growth
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C
Claudia
2 months ago
Rated 5 out of 5 stars
5 Stars
I love the scent
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K
Kathleen
2 months ago
Rated 5 out of 5 stars
5 Stars
Very good product
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