Ingredients that fuel
our formulas
Clinically inspired hair care that supports hair strength and scalp health from root to tip.
Redensyl™
Why we picked Redensyl™
We picked Redensyl™ for the men’s range because of who it was tested on. The men in that trial weren’t starting to wonder - they were already visibly thinning. Twelve weeks in, the 14 men using a 3% Redensyl™ lotion had measurably more hairs per square centimetre than when they started.*
The Clinical Studies
84 days, and a placebo group
One trial sits behind these numbers, run by Givaudan, who make Redensyl™. Fourteen men used a 3% Redensyl™ lotion for 84 days while twelve used a placebo. A dermatologist supervised the trial and hairs were counted on a marked patch of scalp. The placebo group showed no statistically significant change. The trial did not compare the two groups directly.* It tested the raw ingredient in a lotion, not our finished formula.
Hairs per square centimetre: +17 - an average gain on where the 14 men started, after 84 days
Growing-phase hair: 71% - share of hairs in the growing phase at day 84, up from 65%
Men with denser hair: 85% - 12 of 14 men had more hairs per square centimetre, with more growing-phase hair and less resting-phase hair
Increased Hair Density
More hairs per square centimetre, on average, than the 14 men started with
Growing-Phase Hair
Of hairs in the growing phase by day 84, up from 65%
Men With Denser Hair
12 of 14 men had more hairs per square centimetre, with more growing-phase hair and less resting-phase hair
33 blokes. Five weeks. No lab coats.
30 of 33 men said their hair felt stronger
29 of 33 men said their hair looked fuller
28 of 33 men said they would buy again
Find Redensyl™ in
Target, Tone & Look Fuller
Cleanse, Condition & Power Up
Questions we get a lot
What is Redensyl™?
A cosmetic hair active built from two stabilised plant polyphenols, the amino acid glycine and a little zinc. It goes into leave-on and wash-off scalp products, and it's been studied for denser-looking hair.
What does Redensyl™ do for hair?
In its main trial, men using a 3% Redensyl™ lotion for 84 days ended up with 17 more hairs per square centimetre than they started with, about 70% of their hairs in the growing phase rather than 65%, and 12 of the 14 recorded denser-looking hair. That's a cosmetic result, not a treatment for hair loss.
Is Redensyl™ clinically proven to regrow hair?
No. The main study was run and published by Redensyl™'s own manufacturer, not in an independent journal, and it had 14 men in the treated group. Two independent randomised studies exist, but both tested Redensyl™ as part of a multi-ingredient blend, so neither shows what Redensyl™ did on its own. Growth Bomb doesn't claim Redensyl™ regrows hair.
What's actually in Redensyl™?
It's Glycerin, Water, Larix Europaea Wood Extract, Glycine, Zinc Chloride, Camellia Sinensis Leaf Extract, Sodium Metabisulfite - two stabilised polyphenols (DHQG from larch wood, EGCG2 from green tea) with the amino acid glycine and zinc chloride.
How long does it take to see results?
The study took readings at 30 days and again at 84, and the bigger changes were at 84. Give the Men's Power range at least six weeks of consistent use before you judge it - this is an active you measure in months, not washes.
Which Growth Bomb products contain Redensyl™?
The POWER Cleanse 2-in-1 Shampoo & Conditioner and the POWER Tonic. It's not in any of our oral supplements.
Is Redensyl™ safe? Does it have side effects?
Redensyl™ is a cosmetic hair ingredient. We can’t promise it suits every scalp, so patch test first and stop using it if you get irritation. Check with your doctor if you have a scalp condition, allergies, or you’re pregnant or breastfeeding.
*Givaudan Active Beauty (2018) Scientific File - Redensyl®, Version 04, 06/2018 [Manufacturer technical file]. Pomacle, France.
Karaca, N. and Akpolat, N.D. (2019) A comparative study between topical 5% minoxidil and topical "Redensyl, Capixyl, and Procapil" combination in men with androgenetic alopecia. Journal of Cosmetology & Trichology, 5(1), 140.
Pavithra, T.R., Rajashekar, T.S., Suresh Kumar, K. and Prasanna, H. (2023) A comparative study of topical Procapil with platelet-rich plasma therapy versus topical Redensyl, saw palmetto, and biotin with platelet-rich plasma therapy in the treatment of androgenetic alopecia. Cureus, 15(5), e38696.
†Self-reported participant outcomes, not clinically measured. Individual results vary. Growth Bomb Hair Tonic in-home use test, Measure Protocol, n=33 male participants, five-week self-use period. Results are for the tonic used on its own - and for the finished product, which contains Redensyl™ alongside other actives, not for Redensyl™ on its own.
