A treatment shampoo that clears scales and calms itching
Ducray Kertyol P.S.O. Rebalancing Treatment Shampoo is a treatment shampoo for psoriasis-prone scalps with thick scales, flaking and itching. It works as a supportive care: salicylic acid helps loosen and remove scales, and Vederine, a chicory root extract, helps the scalp renew itself normally. Celastrol, an active of natural origin from Pierre Fabre biotechnology, targets the build-up of plaques, while ictasol (pale ichthyol) helps soothe. The brand reports 77% less itching from the first uses and 78% thinner plaques after one month. Coconut oil and glycerin keep hair soft and easy to comb despite the purifying action.
How it works
A creamy shampoo that lathers well and rinses easily. It is used as a short course, three times a week for four weeks, then once a week to keep results, alternating with a gentle shampoo. The second application is left on for two to three minutes so the actives have time to work on the scales.
Who it suits
- Scalps prone to psoriasis with thick, stuck-on scales
- Flaking with redness and itching
- All hair types
- Adults who want a routine that can be kept up over time
Worth knowing before you buy: it contains fragrance and sulfates, and the salicylic acid can sting on scratched skin. It is a cosmetic supportive care, to be used alongside any treatment you already follow.
How long one tube lasts
During the four-week intensive phase, a 200ml tube usually lasts the whole course for short to medium hair. On maintenance once a week, it lasts about three months.
Complete the routine

Kertyol P.S.O. Concentrate
A leave-on gel for thick scales on small areas.
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Extra-Doux Shampoo
A mild shampoo for the days in between.
Shop →Characteristics
- Texture: cream shampoo
- Hair type: all hair types
- Concerns: psoriasis-prone scalp, scales, flaking, itching
- When to apply: 3 times a week for 4 weeks, then once a week
- Main benefits: helps remove scales, reduces itching, helps limit plaque build-up, keeps hair soft
How to use
Apply to damp hair, massage gently and rinse. Apply a second time, leave on for 2 to 3 minutes, then rinse thoroughly. Use 3 times a week for 4 weeks, then once a week, alternating with a gentle shampoo. Avoid contact with the eyes.
Active ingredients
- Salicylic acid: helps loosen and remove scales
- Vederine (chicory root extract): supports normal scalp renewal
- Celastrol (Tripterygium wilfordii callus extract): helps reduce plaque build-up
- Ictasol (pale ichthyol): soothes the scalp
Ingredients
Water (aqua) · Cocos nucifera (coconut) oil · sodium trideceth sulfate · sodium lauroamphoacetate · cocamide MIPA · glycerin · sodium chloride · salicylic acid · 1,2-hexanediol · caprylyl glycol · Cichorium intybus (chicory) root extract · fragrance (parfum) · ictasol · pentylene glycol · Tripterygium wilfordii callus extract
Formulations are updated by the manufacturer from time to time. Always check the packaging you receive.
Manufacturer information
Brand: Laboratoires Dermatologiques Ducray
Address: Les Cauquillous, 81506 Lavaur Cedex, France
EAN: 3282770148473
