Topical retinol reduces fine lines and improves skin texture through cell renewal and thickening of the skin layers. The effect is real but variable, skin irritation is a well-known side effect, and the stronger tretinoin (by prescription) is a more potent option. Bakuchiol appears equally effective with less irritation, but requires further research.
Topical retinol (a form of vitamin A applied to the skin) demonstrably reduces fine lines and wrinkles and improves skin texture. It also increases the thickness of both the outer and deeper layers of the skin. However, most studies have been conducted in people with sun-damaged skin, also known as photoaging. The evidence for purely age-related wrinkles without sun damage is therefore somewhat less strong.
Retinol is not the most potent agent in its class. Tretinoin, also a retinoid but available only by prescription, is considered the clinical gold standard for topical skin rejuvenation. It is more powerful and more thoroughly researched, but also causes more side effects. Retinol is therefore a less potent but more freely available alternative.
A notable downside of retinol is skin irritation: burning, flaking and sometimes dermatitis (skin inflammation) are well-known side effects. Although retinol is less irritating than tretinoin and tazarotene, these side effects can still cause people to discontinue use. Gradually building up the concentration can help.
Bakuchiol, a plant-derived ingredient that acts through mechanisms in the skin similar to those of retinol, offers an alternative with less irritation. In a randomised double-blind study with 44 participants over 12 weeks, both bakuchiol (0.5%, twice daily) and retinol (0.5%, once daily) significantly reduced wrinkle surface area. There was no statistically significant difference in effectiveness, but retinol users experienced more flaking and burning. One case of contact dermatitis has been reported with bakuchiol, and more research is still needed.
In summary: retinol works, but it is not magic. The effect is real and likely causal, but the degree of improvement varies by person and study. Those with sensitive skin or who do not tolerate retinol may consider bakuchiol as an alternative with comparable but not yet exhaustively proven effects.
Claims based on PMIDs 38002296, 18046911, 37903073, 39108105, 29947134 and 36176207. The bakuchiol-versus-retinol study had only 44 participants and lasted 12 weeks, which limits generalisation. No meta-analyses were used as direct sources; the evidence for tretinoin is the strongest, and for retinol and bakuchiol moderate.