BeautyRival – Alpha Hydroxy Acids (AHA), Beta Hydroxy Acids (BHA), and Polyhydroxy Acids (PHA) are popular chemical exfoliants used in skincare. They work by removing dead skin cells, improving texture, and brightening the complexion. However, because of their potency, they should be used with caution and never mixed with certain active ingredients to avoid skin irritation or damage.
Why Mixing Can Be Risky
Each of these acids has exfoliating properties, which can make the skin more sensitive. Combining them with other strong actives can lead to over-exfoliation, redness, dryness, or even skin barrier damage. The key is to understand which ingredients complement them and which ones create harmful reactions when layered together.
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Avoid Mixing with Retinol
Retinol speeds up cell turnover, while AHA, BHA, and PHA exfoliate the skin’s surface. Using them together can cause excessive irritation, peeling, and inflammation. Dermatologists recommend alternating their use—apply acids on one day and retinol on another to minimize risk.
Be Careful with Vitamin C
Vitamin C, particularly in its pure ascorbic acid form, works best in a low pH environment, similar to AHA and BHA. However, combining them can destabilize both formulas, reducing their effectiveness and increasing the risk of irritation. To get the full benefits, use vitamin C in the morning and acids at night.
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Benzoyl Peroxide and Strong Acids Don’t Mix
Benzoyl peroxide is a powerful acne-fighting ingredient, but it can be too harsh when paired with chemical exfoliants. The combination may strip the skin of its natural oils, causing extreme dryness, flaking, and breakouts. It’s better to use benzoyl peroxide on alternate days from your acid-based products.
Other Ingredients to Avoid
High concentrations of alcohol, physical scrubs, or clay masks should also be used cautiously with AHA, BHA, and PHA. These products can compound exfoliation effects, leading to microtears and further weakening the skin barrier. Instead, pair your acids with hydrating serums or soothing moisturizers to protect and nourish the skin.
