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Hair Density Serum

Peptide-Powered Scalp Serum for Thicker, Fuller-Looking Hair
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30 DAY

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  • Formulated with Acetyl Tetrapeptide-3 and Biotinoyl Tripeptide-1 — clinically studied peptides that target thinning at the root

  • Caffeine and Green Tea Extract help support thicker, healthier-looking hair and reduce the appearance of hair fall

  • Lightweight, no-rinse formula absorbs in minutes — use daily on dry or freshly washed hair

If your hair is thinning, shedding more than usual, or your part is getting wider — this serum was made for you.

Polar's Hair Density Serum targets thinning at the scalp level. It combines two clinically studied peptides (Acetyl Tetrapeptide-3 and Biotinoyl Tripeptide-1) with Caffeine, Green Tea Extract, and Zinc to support stronger, thicker-looking hair from the root.

The peptides work by nourishing the hair follicle and improving the anchoring of each strand. Caffeine extends the growth phase of your hair. And Zinc supports a healthy scalp environment for hair to thrive.

Apply directly to your scalp once a day. It absorbs in minutes, doesn't need to be rinsed out, and won't leave your hair greasy or weighed down. Just apply and go.

See results in 90 days — most people start noticing a difference after consistent daily use. This isn't an overnight fix. It's a daily habit that builds real results.
Step 1: Dispense serum directly onto your scalp on dry or freshly washed, blow-dried hair.

Step 2: Gently massage into your scalp for 1–2 minutes until fully absorbed.

Step 3: Do not rinse. Style your hair as usual. For best results, use daily.
Ingredients:
Water, Glycerin, Butylene Glycol, Pentylene Glycol, Disodium EDTA, Phenoxyethanol, Hydroxyethylcellulose, Zinc Chloride, Sodium Bisulfite, Glycine, Camellia Sinensis Leaf Extract, Larix Decidua Wood Extract, Caffeine, Apigenin, Oleanolic Acid, Biotinoyl Tripeptide-1, Acetyl Tetrapeptide-3, Citric Acid / Sodium Hydroxide, Fragrance

Key actives:
Acetyl Tetrapeptide-3, Biotinoyl Tripeptide-1, Caffeine, Apigenin, Oleanolic Acid, Green Tea Extract, Zinc
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4 Reasons To Choose
Polar Hair Density Serum

4 Reasons To Choose
Polar Hair Density Serum

Clinically studied peptides

Powered by Acetyl Tetrapeptide-3 and Biotinoyl Tripeptide-1 — peptides that have been studied for their ability to support hair density and reduce hair fall at the follicle level.

Caffeine-boosted formula

Caffeine extends the growth phase of your hair and counteracts the effects of hormones that cause thinning. One of the most proven topical hair ingredients available.

Lightweight, no-rinse daily treatment

Absorbs in minutes. No greasy residue. No rinsing. Just apply to your scalp and go about your day. Fits into any routine without adding extra steps.

Built for the Polar routine

Use alongside your Polar Instant Dye Shampoo and Color Protect Shampoo. Cover your grays AND strengthen your hair — all in one place.

Perfect Additions

FREQUENTLY ASKED QUESTIONS
Hair growth cycles take time. Most people start noticing less shedding within the first 4–6 weeks of daily use. Visible improvements in thickness and density typically become noticeable with consistent use over 2–3 months. Don't give up after a week — this is a daily habit that builds real results over time.
Apply directly to your scalp on dry or freshly washed, blow-dried hair. Massage gently for 1–2 minutes until absorbed. Do not rinse. Style as usual. Use once daily for best results.
No. The formula is lightweight and water-based. It absorbs quickly into the scalp without leaving any greasy residue or weighing your hair down.
Yes. It works perfectly alongside the Instant Dye Shampoo and the Color Protect Shampoo. In fact, the three products together give you full coverage — color your grays, protect that color, and strengthen your hair all at once.
Yes. The serum is designed to work on all hair types — straight, wavy, curly, or coily. It's applied directly to the scalp, so hair texture doesn't affect how it works.
Absolutely. It works the same way on men and women. Many customers use it on both their scalp and areas of thinning in their beard.
The key actives are Acetyl Tetrapeptide-3 and Biotinoyl Tripeptide-1 (clinically studied peptides that target hair thinning at the follicle), Caffeine (extends the growth phase of hair), Green Tea Extract (antioxidant and DHT support), and Zinc (supports a healthy scalp). These aren't filler ingredients — each one has research behind it.
This is a cosmetic serum, not a drug. It uses a different approach — peptides and botanicals rather than pharmaceutical actives. Many people use it as a standalone daily treatment, and some use it alongside other products. If you're currently using a prescription treatment, consult your doctor before making any changes.
The serum is designed to support the appearance of thicker, fuller hair and reduce the look of thinning — which are common concerns during menopause and aging. It nourishes the follicle and supports a healthy scalp environment. While individual results vary, many of our customers dealing with age-related thinning have seen positive results with consistent daily use.
One bottle lasts approximately 30 days with daily use, depending on how much you dispense per application.