What it is
There are hundreds of cosmetic ingredients, but a dozen come up again and again in counter recommendations. Knowing them well lets you guide the customer without analysing each product one by one.
This list is your counter cheat sheet: what each one does, who it suits, when to combine it and when not to.
The 12 ingredients that dominate everything
These 12 appear constantly in active cosmetics:
- RETINOL — The anti-ageing star. Speeds up renewal. Irritating at first. Increase gradually.
- HYALURONIC ACID — Hydration at molecular level. Traps water. Works better in humid climates or under an occlusive.
- VITAMIN C — Antioxidant + radiance. Unstable: L-ascorbic acid needs a low pH and opaque packaging. Ideal in the morning.
- NIACINAMIDE — Sebum control + pores. Anti-inflammatory. Tolerated by almost everyone. Dose: 4–10%.
- PEPTIDES — Stimulate collagen. Gentle. Combine well with retinol and vitamin C.
- AZELAIC ACID — Rosacea + dark spots. Anti-inflammatory. At 15–20% it is a medicine; in pregnancy it is usually considered compatible (confirm).
- SALICYLIC ACID — Unclogs pores. Only for oily / acne-prone skin. Drying if overused.
- CERAMIDES — Barrier repair. Essential for sensitive skin. Combine well with everything.
- CENTELLA ASIATICA — Soothing. Anti-inflammatory. Very safe. Ideal for reactive skin.
- BAKUCHIOL — A gentler 'alternative to retinol'. Less evidence, better tolerance. No data in pregnancy.
- TOPICAL CAFFEINE — Local decongestant. Reduces under-eye puffiness. A temporary but immediate effect.
- LACTIC ACID — Gentle exfoliation. Paradoxically moisturising. 2–3 nights a week.
At the counter
When to recommend it
- Recommend by SKIN TYPE: oily (BHA + niacinamide), dry (retinol + ceramides), sensitive (centella + peptides).
- Start with low concentrations and increase gradually.
- Advise patience: 'give it 8–12 weeks before judging'; vitamin C shows sooner.
- Combine intelligently: 'vitamin C in the morning; retinol at night twice a week'.
When not to
- Do not mix irritating actives in the first month: retinol + AHA is too strong.
- Do not promise results in days. Collagen takes months.
- Do not sell strong retinol to someone who does not know what retinisation is.
What to say at the counter. The question that sets good advisers apart: 'First tell me about your current routine. What do you already use?' That way you don't recommend a retinol to someone who already uses a BHA.
Warnings
- Important Retinol has an 'adaptation period' (2–4 weeks) with redness. You MUST warn about it.
- Important Vitamin C (L-ascorbic acid) is unstable: once opened it loses effectiveness quickly.
- Caution Niacinamide has a myth attached: 'it doesn't mix with vitamin C'. FALSE.
- Caution Hyaluronic acid works less well in very dry environments if applied on its own: it is worth sealing it with a cream.
- Worth knowing Concentrations in cosmetics are often a mystery. Trust the effect more than the %.
Step by step
- Formulation is everything: the best retinol in a poor formula does not work. Water-soluble actives need a low pH. Fat-soluble ones need oily vehicles.
- CONCENTRATION is key: retinol 0.3% is different from 1%. Vitamin C at 10% is basic; 20% is strong. Advertising often hides the real concentration.
- Some actives clash: vitamin C + retinol can irritate together. Niacinamide + salicylic acid is fine. Retinol + AHA risks irritation.
- Time matters: retinol has 2–4 weeks of adaptation and its results are judged from 8–12 weeks. Vitamin C brings radiance within a few weeks. The right expectations prevent people giving up.
Which active for which goal
| Aspect | What for | Main caution |
|---|---|---|
| Retinol | Anti-ageing, texture | Initial irritation; not advised in pregnancy |
| Vitamin C | Antioxidant, radiance | It oxidises: opaque, closed packaging |
| Niacinamide | Sebum, pores, redness | Very well tolerated |
| Azelaic acid | Rosacea, dark spots | Itching in the first days |
| Salicylic acid | Pores, mild acne | Drying if overused |
| Ceramides | Repairing the barrier | On acne-prone skin, non-occlusive formulas |
There is no 'best active'. There is the best active for that skin and that goal.
Self-assessment
Three questions. When you check your answers you will see the explanation for each one.
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Niacinamide controls sebum without irritating. BHA unclogs pores. Retinol is more for anti-ageing.
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Retinol needs months. Redness and flaking in the first few weeks are normal and do not mean it isn't working.
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The myth is false. They work well together.
Training content. It does not replace the summary of product characteristics or clinical judgement.