When this process starts to slow, you need something that stimulates collagen and speeds the turnover of skin cells, says Neil Sadick, MD, a dermatologist in New York City and clinical professor of dermatology at Weill Cornell Medical College. “Retinoids are still the No. 1 collagen stimulator,” he says. (Most retinoids are prescription, but weaker forms called retinols can be found over the counter; ask your dermatologist what they’d recommend for you.)
You may also want to consider an alpha hydroxy acid (AHA) serum for cell turnover (some people may not tolerate an AHA). Ideally, start with one that contains 5 percent AHA, and work up to greater concentrations as long as it is tolerable. Alternate between the retinoid and the AHA in your nightly routine, Dr. Sadick says. Examples of AHAs are glycolic and lactic acid.
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