The Keratin Guide

Brazilian blowouts and keratin straightening are often presented as the same thing, and keratin haircare has nothing to do with either. Results, duration, price, precautions and upkeep: we...

Hair botox contains no botox, and "keratin" means two very different things depending on whether you mean a salon service or an at-home product. Real effects, duration, price...

"Sulfate-free" has become a buying reflex. What sulfates actually do in a shampoo, which ones strip, which ones are gentle, who genuinely benefits from avoiding them and how...

Hair Porosity: How to Spot It and Adapt Your Care

Low, medium or high: the 3 ways to assess your hair's porosity, what the glass of water test is really worth, and the right routine for each profile.

Rosemary Oil: Does It Really Boost Growth and Volume?

Composition, the reference study, real mechanisms and precautions: what rosemary oil genuinely brings to hair, and what it does not do.

Seasonal Hair Shedding: Understanding It and Acting on It

A shedding peak between September and November: why it happens, the 3 markers that separate normal from concerning, and when to see a doctor.

Hydrolysed Keratin vs Plant Keratin: What's the Difference?

Plant keratin is not keratin in the chemical sense. Composition, comparative efficacy, ethics and label-reading to pick the right protein active.

Caffeine for Hair: What It Actually Does

Microcirculation, growth phase, contact time: what topical caffeine does to the scalp, what it does not do, and how to use it properly.

What Does COSMOS NATURAL Certification Really Mean?

Who certifies, what is checked, what is excluded, and the exact difference with COSMOS ORGANIC: the certification decoded for haircare.

The September Reset: Giving Your Hair a Fresh Start

Scalp, cut, bathroom clear-out, styling and getting ahead of autumn: the 5 September projects that put you back on healthy foundations.

Seawater, Chlorine, Sun: Repairing Hair After Summer

UV, salt and chlorine have opened the cuticle and depleted the keratin. The repair protocol week by week, and the 4 habits that stop you having to start...

Hair Masks: How Long Should You Really Leave One On?

Five to ten minutes is enough. What happens while it sits, why absorption plateaus, the truth about overnight masks and the application method that changes everything.