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THE WINNER ARGUMENT · TRANSPARENTLY PUT INTO CONTEXT
In the laboratory model: 1.8× stronger growth signal than minoxidil.
In a small, manufacturer-documented ex vivo test, isolated human hair follicles were studied for ten days with 1% Redensyl® and 1% minoxidil, respectively.
Manufacturer study using a small number of isolated hair follicles from two donors (Redensyl®: 10, minoxidil: 7, control: 7). No clinical efficacy comparison in humans and no evidence that the complete product offered is superior to minoxidil.
3% REDENSYL® · 84-DAY ACTIVE INGREDIENT STUDY
What was observed after 84 days in the active ingredient study.
A study documented by the active ingredient manufacturer examined a test formulation with 3% Redensyl® over three months—not the finished KÖ-HAIR product.
Active ingredient data or test formulation data from the manufacturer; no clinical testing of the complete product offered here. Individual results may vary.
MINOXIDIL NOT YOUR WAY?
A cosmetic leave-in routine with 3% Redensyl®.
Spray directly onto the scalp, massage in gently, and do not rinse—for a simple daily care routine without minoxidil.
3% Redensyl®No rinsing requiredTargeted application to the scalpNot a medicinal product
Cosmetic care product; does not treat hair loss. Medical advice should be sought in cases of severe, sudden-onset, or unexplained hair loss.
KÖ-HAIR CIRCULATION SERUM SPRAY
Turn good intentions into a daily routine.
50 ml · 3% Redensyl® · Leave-in scalp care
✓ Free shipping within Germany from €35✓ PayPal & Klarna✓ Secure Shopify payment
Cosmetic care product. Results may vary individually.
Since 2011Specialized in hair preservation and hair renewal
In GermanyDeveloped and dermatologically tested
Kliniknahdeveloped from KÖ-HAIR’s experience
Practical for everyday usespray on, massage in, do not rinse
THE DECISIVE ROUTINE
When hair appears thinner, what matters is not frantic action—but consistency.
A convincing hair care routine must be targeted, simple, and easy to maintain in everyday life.
01
Directly onto the scalp
The fine spray nozzle delivers the serum precisely where the care routine begins.
02
Leave-in instead of extra effort
Spray on, gently massage in, and let it absorb—no rinsing afterward.
03
For the daily routine
Easy application makes it easier to stick with your personal care routine over the long term.
CLINICAL EXPERTISE MEETS COSMETIC CARE
Based on more than a decade of experience with all aspects of hair.
KÖ-HAIR has focused on hair preservation and hair renewal since 2011. This proximity to the subject
defines the standard for a care routine: comprehensible ingredients, targeted application
and a product that can be used consistently.
✓ Professional expertise✓ Clear application✓ Transparent communication about active ingredients
THE FORMULA
A focus on active ingredients. Sensibly complemented.
The formula combines 3% Redensyl® with selected conditioning and botanical ingredients.
3 %
Redensyl®
A cosmetic active-ingredient complex studied in connection with the natural hair cycle.
C
Caffeine
An established ingredient in modern scalp and hair care formulations.
B7
Biotin
Complements the cosmetic care formula for hair and scalp.
B5
Provitamin B5
Panthenol is known for its moisturizing and conditioning properties.
THE ACTIVE-INGREDIENT PRINCIPLE EXPLAINED
Redensyl®: Research on the hair follicle.
The cosmetic active-ingredient complex Redensyl® has been studied at the active-ingredient level, among other things, in connection with cells from the bulge region of the hair follicle and fibroblasts of the dermal papilla.
01
Bulge regionHair follicle stem cell region
02
Dermal papillaSignaling region at the base of the hair follicle
Schematic illustration of the active-ingredient approach studied—not a representation of guaranteed product efficacy or the penetration behavior of the finished serum. Active-ingredient source: Givaudan Active Beauty, Redensyl®.
01 · Bulge region02 · Dermal papillaIllustrative depiction of the hair follicle
THE REDENSYL® ACTIVE-INGREDIENT STUDY
What the 84-day study on the active ingredient Redensyl® shows.
In a study documented by the active ingredient manufacturer, a test formulation
with 3% Redensyl® over a period of three months—not the complete product offered here.
+9%Hair in the growth phase
−17%Hair in the resting/shedding phase
+8%average hair density
85 %with a clinically visible improvement
* Active ingredient data for Redensyl® or a test formulation with 3% Redensyl®;
no clinical testing of the complete product. Individual results may vary.
A TRANSPARENT COMPARISON
Redensyl® and Minoxidil are not the same.
A brief overview for anyone who wants to consciously distinguish between cosmetic care and medicinal treatment.
Study comparison & classification
Decision criterion
Circulation with 3% Redensyl®
Minoxidil products
Classification
Cosmetic leave-in care product
Medicinal active ingredient
Underlying idea
Scalp care and support for a consistent cosmetic routine
Medicinal treatment of certain forms of hair loss in accordance with the product information
Application
Spray on precisely, massage in, do not rinse
Use according to the package leaflet for the respective medicinal product
Evidence base
Active ingredient and smaller formulation studies; more limited body of data
More extensive drug studies and approved areas of use
It’s right for you if …
you are looking for a straightforward cosmetic care routine without Minoxidil
you are considering drug treatment following medical or pharmaceutical assessment
SMALL EX VIVO LABORATORY COMPARISON · 10 DAYS
In the laboratory model, Redensyl® showed a stronger growth signal.
Isolated human hair follicles were tested with 1% Redensyl® and 1% Minoxidil, respectively.
1% Redensyl®+214%
vs.
1% Minoxidil+118%
In each case compared with the untreated control after ten days. Manufacturer study using a small number of isolated hair follicles from two donors (Redensyl®: 10, Minoxidil: 7, control: 7). No clinical efficacy comparison in humans and no evidence that the complete product offered here is superior to Minoxidil.
Circulation Serum Spray is a cosmetic care product and is not a substitute for medical
Diagnosis or treatment. If hair loss is severe, sudden, or unexplained,
medical advice should be sought.
PRECISION IN EVERY APPLICATION
A routine that’s easy to stick to.
The fine spray nozzle enables targeted application to the scalp—without meticulous dosing and without rinsing.
Apply the serum section by section and precisely to the clean, dry scalp.
2
Massage in
Distribute gently with your fingertips and massage briefly into the scalp.
3
Let it absorb
Do not rinse out. Then continue with your usual daily routine.
Please follow the complete instructions for use on the product and packaging.
REAL EXPERIENCES
91 Reviews provide guidance.
★★★★★Reviews on KÖSMETIK
Other customers’ experiences help provide a realistic perspective on use, feel, and suitability for everyday life.
Product-specificExperiences specifically with Circulation Serum Spray
CurrentNew reviews are continuously made visible
TransparentBoth positive and critical feedback provide guidance
VERIFIED PRODUCT REVIEW★★★★★
“I have been using Circulation Serum Spray since my hair transplant and am genuinely very satisfied with strong hair that is very easy to style.”
Jens BehrensReview dated 01.07.2026
Personal experience of a customer. The photo does not represent a standardized before-and-after comparison; individual results may vary.
★★★★★
“It’s easy to apply and doesn’t smell bad either.”
Markus P.Verified review · 11.04.2026
★★★★★
“It’s easy to use and massages well into the scalp. Afterward, the hair can be styled as usual.”
AnonymousVerified review · 25.03.2026
★★★★★
“The best product on the market. This serum spray is super easy to use.”
AnonymousVerified review · 19.03.2026
View all original reviews
Excerpts have been shortened for improved readability. Individual experiences and results may vary.
FREQUENTLY ASKED QUESTIONS
What is important to know before buying.
Is the spray a medicinal product?
No. It is a cosmetic care product with 3% Redensyl® and other conditioning ingredients.
Does the product contain minoxidil?
No. Circulation Serum Spray is a cosmetic formulation without minoxidil.
Does the serum need to be rinsed out?
No. It is applied to the scalp, gently massaged in, and, as a leave-in product, is not rinsed out.
When can changes be assessed?
Hair cycles take time. The Redensyl® ingredient study examined a period of 84 days. However, this does not guarantee a timeframe or results for the product as a whole.
Can the spray be used after a hair transplant?
After a procedure, only the individual aftercare instructions provided by the treating clinic should be followed. If in doubt, please consult the clinic before use.
