Ingredients

A pharmacist-led guide to cosmetic actives. Every ingredient explained with scientific evidence: what it does, how to use it and what to combine it with.

Evening primrose oil: when it makes sense for skin and hair
barrier
Evening primrose oil: when it makes sense for skin and hair
It's not an oil for everyone, but it can be suitable for dry, sensitive, or reactive skin and damaged ends.
Published: 03 June 2026
Chamomile extract in cosmetics: when it's worth it
anti-inflammatory
Chamomile extract in cosmetics: when it's worth it
A classic botanical ingredient that can help calm skin, but it's important to understand what it does and doesn't do.
Published: 03 June 2026
Vitamin K in cosmetics: when it makes sense and when it doesn't
renewing
Vitamin K in cosmetics: when it makes sense and when it doesn't
It is not one of the most well-known assets, but in certain contexts, it can make sense. I'll explain where it fits i...
Published: 03 June 2026
Mango Butter: When it provides comfort and when it falls short
emollient
Mango Butter: When it provides comfort and when it falls short
A very pleasant vegetable butter for dry or sensitized skin, but with important nuances if you're looking to treat ac...
Published: 03 June 2026
Cucumber extract: when it provides comfort to the skin
antioxidant
Cucumber extract: when it provides comfort to the skin
A gentle botanical active that can provide freshness and comfort, but it's important to understand what it truly does...
Published: 03 June 2026
Ginkgo biloba extract: when it makes sense in cosmetics
antioxidant
Ginkgo biloba extract: when it makes sense in cosmetics
An interesting botanical active for its antioxidant and soothing profile, although one should not expect major change...
Published: 03 June 2026
Arginine: when it makes sense in cosmetics and what you can expect
barrier
Arginine: when it makes sense in cosmetics and what you can expect
An amino acid useful for supporting skin hydration and comfort, with a more discreet role than marketing sometimes su...
Published: 03 June 2026
Devil's Claw extract in your routine: when yes and when no
anti-inflammatory
Devil's Claw extract in your routine: when yes and when no
I'll explain what harpagophytum extract is, what real benefits it can bring to the skin, what precautions you should ...
Published: 03 June 2026
Jojoba esters: when they make sense in cosmetics
emollient
Jojoba esters: when they make sense in cosmetics
An emollient and soothing ingredient that improves skin comfort without complicating your routine, especially when yo...
Published: 03 June 2026
Cornstarch (corn starch): benefits, uses, and combinations
soothing
Cornstarch (corn starch): benefits, uses, and combinations
Cornstarch acts primarily as an absorbent and soothing cosmetic. I'll explain when it can help, its limitations, and ...
Published: 03 June 2026
Laminaria extract: when it truly fits into a soothing routine
antioxidant
Laminaria extract: when it truly fits into a soothing routine
An interesting marine active for sensitive, dehydrated or altered skin, with more soothing than spectacular benefits.
Published: 03 June 2026
Ivy extract in cosmetics: when it can be beneficial
anti-inflammatory
Ivy extract in cosmetics: when it can be beneficial
It's not one of the most decisive botanical extracts, but it can fit into soothing and antioxidant formulas with real...
Published: 03 June 2026

What are cosmetic active ingredients

Cosmetic active ingredients are the components responsible for making a product do what it promises. Unlike excipients (which provide texture, preservation or fragrance), actives are the ones that produce a real, measurable effect on the skin: stimulating collagen, inhibiting melanin, strengthening the skin barrier or accelerating cell renewal.

The problem is that most brands do not explain which actives they use, at what concentration or why. This pharmacist-led guide to cosmetic ingredients was created to change that: each article analyses an active ingredient with the available scientific evidence, without exaggeration or empty promises.

How to use this ingredient guide

Each article in this guide includes a summary card with the INCI name, effective concentration, potency, recommended skin type, routine step and compatibility with other actives. You will also find information on use during pregnancy and verifiable scientific references.

All content is written and reviewed by a licensed pharmacist with over 20 years of experience. This is not a standard cosmetic ingredient list — it is a professional guide designed to help you make informed decisions about your skincare.

Arancha Grediaga
Author and reviewer
Pharmacist · Dermocosmetics Expert · COFA License #6497
+20 years of community pharmacy experience · Technical Lead at EVUE Cosmetics