If there’s one headliner that deserves a spot in your skincare routine, it’s retinol, the do-it-all beauty ingredient with gold standard pedigree. But what is retinol exactly, and how did it earn this five-star reputation? The powerful form of vitamin A has long been a derm favourite for its ability to completely transform the skin from the inside out; potency and performance is what sets retinol apart from the countless other radiance-promising products you’ve encountered.

Some science speak for a second: retinol works by encouraging cell turnover at a speedier rate, while amping up the production of collagen—the keys to achieving fresh, dewy skin. The benefits of this one-two punch are bountiful: dark spots, including acne scars, are minimized, skin takes on a glowy, illuminated quality, plus fine lines and wrinkles are minimized. Given its abundance of skin-supporting perks, experts recommend incorporating retinol into your regimen as early as your mid-20s—it’s a prudent measure to curb the signs of aging before they become a real issue.

Retinol takes a starring role in Olay’s new Regenerist skincare line, Retinol24. Boasting all the upsides you’d expect, these formulas—take your pick, a Night Cream, Night Eye Cream or Night Serum—also solve the pesky side effects that often go hand-in-hand with retinol use. That itchy, flaky irritation you’ve heard about? Eliminated. Long wait times to see visible results? Gone. Formulated with soothing vitamin B3 and the brand’s special Retinoid Complex, which contains retinol and retinyl propionate, a less irritating form of vitamin A, this gentle, but powerful night collection delivers 24 hours of uncompromising hydration that continues to work throughout the day. But the proof’s in the results: in clinical studies, 96 per cent of participants reported no skin irritations while seeing visible improvements within 28 days. Now all types of skin, even the most sensitive ones, can get the brightening boost come morning.