Every guide includes what it is, what it actually does, evidence strength, who should avoid it, ideal concentrations, smart pairings, and pregnancy notes.
These are the ingredients we get asked about most — and the ones that shape almost every modern routine.
Retinol, retinal, retinyl esters, tretinoin. Best for aging, texture, acne.
Vitamin CL-ascorbic acid and derivatives. Best for dullness, tone, sun damage defense.
NiacinamideVitamin B3. Best for pores, redness, oil balance, barrier support.
Azelaic acidBest for rosacea, hyperpigmentation, hormonal acne. Pregnancy-friendly.
PeptidesMatrikines, signaling peptides, neuropeptides. Firmness without irritation.
CeramidesSkin's own lipids, replaced. Dry skin, sensitivity, post-procedure.
AHAs / BHAs / PHAsGlycolic, lactic, salicylic, mandelic, gluconolactone. Texture and tone.
SPF filtersMineral vs chemical, new filters, photostability, real-world protection.
Copper peptidesGHK-Cu. Wound healing, firmness, hair density support.
Growth factorsEGF, TGF, others. Post-procedure recovery, firmness research.
ExosomesHot topic, thin data, evolving regulation. What to know.
| Strong | Multiple well-designed RCTs in humans, reproducible outcomes on meaningful endpoints. |
|---|---|
| Moderate | Limited human studies, consistent direction, mechanistic plausibility. |
| Emerging | Early human data, often single-study, often industry-funded. |
| Weak | In-vitro or animal data only. Marketing outruns the science. |