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Alpha Hydroxy Acids (AHAs)
Glycolic, lactic, citric, and malic acids

Loosen the bonds between the dead cells in skin's uppermost layer so they can be shed, improving texture and adding radiance.

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A night lotion with glycolic acid and powerful moisture-retaining humectants, like Olay Regenerist Night Resurfacing Elixir ($32; drugstores), is a gentle option when your skin is dry.

To smooth away little bumps on your arms and legs, try AmLactin Moisturizing Body Lotion ($16; drugstores). Lactic acid sloughs off dead skin cells that may be causing the bumps, and helps skin retain moisture.

The pads in Dr. Dennis Gross Skincare Alpha Beta Face Peel ($78 for 30 applications; are packed with AHAs, plus anti-inflammatory ingredients to combat irritation.