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Retinol

INCI: Retinol
Also known as: Vitamin A alcohol, ROL
RetinoidsretinoidsyntheticStrong evidenceNot for pregnancy
94
Skinlumis Rating
Comedogenic
1/5
Irritancy
3/5
Best applied
PM
Effective range
0.1%–1.0%
How It Works

The gold-standard over-the-counter retinoid. Retinol is converted in skin to retinoic acid, regulating cell turnover and stimulating collagen synthesis. Two decades of clinical evidence underpin its anti-aging credentials.

Enzymatically oxidised to retinaldehyde then to all-trans retinoic acid, which binds nuclear retinoic-acid receptors (RAR/RXR). This upregulates collagen I/III and downregulates matrix metalloproteinases, normalising keratinisation in the pilosebaceous unit.

pH Range
5.0–6.0
Benefits
  • Smooths fine lines and wrinkles
  • Improves skin texture
  • Fades hyperpigmentation
  • Normalises pore-lining cells
  • Stimulates dermal collagen
Proven For

What the evidence supports.

PhotoagingFine linesHyperpigmentationAcne
Best For
  • Normal
  • Oily
  • Combination
  • Mature
Avoid If
  • Pregnant
  • Breastfeeding
  • Severely compromised barrier
Layering Order
6/10

Later treatment or moisturiser step.

Max Safe Concentration
1.0%

Concentration range in well-formulated products: 0.1%–1.0%

Seasonal Use

Best initiated in autumn/winter; reduce to 1–2× weekly in high-UV summer months.

Nutrition Connection

Dietary Vitamin A: liver, egg yolk, dairy, beta-carotene from carrots and sweet potato.

Skin Signals When You Need It
  • Rough, dry texture
  • Slow cell turnover
  • Persistent dullness
  • Worsening fine lines
For Estheticians & Professionals

Start at 0.25% twice weekly; escalate over 8 weeks. Always sandwich between moisturiser layers for compromised barriers.

Notable Research
  • Kafi et al. 2007, improved fine lines after 24 weeks of 0.4% retinol
  • Mukherjee et al. 2006, retinol stabilises collagen IV in photodamaged skin
Clinical Evidence

The research behind Retinol.

4 peer-reviewed studies

Every claim on this page traces to published research. Findings below are drawn from randomized trials and systematic reviews, each links to the study on PubMed.

Randomized Controlled Trial
Topical retinol 0.4% significantly improved fine wrinkles and skin texture after 24 weeks.
Kafi R, Kwak HSR, Schumaker WE et al.
Archives of Dermatology, 2007
View Study →
Randomized Controlled Trial
Daily sunscreen use reduced photoaging markers by 24% over 4.5 years compared to discretionary use.
Hughes MCB, Williams GM, Baker P, Green AC
Annals of Internal Medicine, 2013
View Study →
Systematic Review
Oral collagen peptides at 2.5-10g daily significantly improved skin elasticity and reduced wrinkle depth after 8-12 weeks across 11 RCTs.
Choi FD, Sung CT, Juhasz MLW, Mesinkovska NA
Journal of Drugs in Dermatology, 2019
View Study →
Systematic Review
Estrogen deficiency following menopause causes 30% reduction in skin collagen within the first 5 years.
Wilkinson HN, Hardman MJ
Maturitas, 2017
View Study →
Pairs Well With
NiacinamidePeptides (Matrixyl)Ceramide NPSqualane
Conflicts With
Vitamin C (L-Ascorbic Acid)Benzoyl PeroxideGlycolic AcidSalicylic Acid
Your Skin Compatibility

Sign up to see how Retinol fits your skin archetype and personalised protocol.

The science behind Retinol

3 studies from the Intelligence Vault that discuss Retinol.

Browse the Vault →