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.

Hyaluronic acid (high MW): what it is, what it's for, and how to use it in your routine
barrier
Hyaluronic acid (high MW): what it is, what it's for, and how to use it in your routine
High molecular weight hyaluronic acid is a moisturizing active ingredient that primarily acts on the skin's surface, ...
Published: 03 June 2026
Niacinamide (vitamin B3): real benefits and how to use it correctly
antioxidant
Niacinamide (vitamin B3): real benefits and how to use it correctly
Niacinamide helps strengthen the barrier, regulate sebum, soothe redness, and even out skin tone. I'll tell you what ...
Published: 03 June 2026
The Complete Guide to Argan Oil for Facial Care
barrier
The Complete Guide to Argan Oil for Facial Care
Argan Oil Pharmaceutical Guide: what it is, what skin type it suits, and the mistakes you should avoid to get the mos...
Published: 03 June 2026
Coconut oil on your skin: what works, what doesn't, and for whom it makes sense
anti-inflammatory
Coconut oil on your skin: what works, what doesn't, and for whom it makes sense
A clear guide to coconut oil in cosmetics: what it contributes to the skin barrier, which skin types it's best for, a...
Published: 03 June 2026
Shea butter: what it is, what it's for, and how to use it
barrier
Shea butter: what it is, what it's for, and how to use it
Shea butter is a natural emollient that is very useful for strengthening the skin barrier, reducing dryness, and soot...
Published: 03 June 2026
Complete guide to panthenol (pro-vitamin B5) for facial care
barrier
Complete guide to panthenol (pro-vitamin B5) for facial care
Panthenol is a moisturizing and repairing active ingredient very useful when the skin is dehydrated, sensitive, or ha...
Published: 03 June 2026
Arnica extract in cosmetics: when it makes sense and when it doesn't
anti-inflammatory
Arnica extract in cosmetics: when it makes sense and when it doesn't
Not all soothing agents work for everything. Arnica extract can be a good fit for comforting formulas, but it's impor...
Published: 03 June 2026
Witch hazel water: what it is, what it's for, and how to use it
barrier
Witch hazel water: what it is, what it's for, and how to use it
Witch hazel water is a soothing and astringent ingredient primarily used on combination, oily, or irritation-prone sk...
Published: 03 June 2026
Castor oil in cosmetics: everything you need to know
barrier
Castor oil in cosmetics: everything you need to know
Castor oil in cosmetics: what it can really do for your skin and hair, how to use it correctly, and its limitations a...
Published: 03 June 2026
What is organic silicon and how can it help your skin
barrier
What is organic silicon and how can it help your skin
I'll explain what organic silicon is, what it's used for in cosmetics, what to combine it with, and what results you ...
Published: 03 June 2026
Vegetable squalane: light emollience and skin barrier support
barrier
Vegetable squalane: light emollience and skin barrier support
A skin-native lipid that helps to soften, reduce water loss, and improve skin comfort without a dense feel.
Published: 03 June 2026
Oat extract on sensitive skin: when it truly brings calm
antioxidant
Oat extract on sensitive skin: when it truly brings calm
A useful aid for sensitive, dry or reactive skin when the formula is well-planned and not expected to deliver more re...
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