Chemical exfoliation using alpha hydroxy acids and beta hydroxy acids has become one of the most widely adopted steps in skincare routines, and for good reason. AHAs such as glycolic acid and lactic acid work at the skin's surface to loosen dead cell buildup, supporting a clearer and more even appearance over time. Glycolic acid is the smallest AHA molecule and penetrates readily, making it effective at lower concentrations; lactic acid is larger and typically gentler, suiting sensitive or dry skin. Salicylic acid, the key BHA, is oil-soluble and works within the pore, which is why it remains a consistent recommendation for oily and congestion-prone skin types. For those asking which acid to start with, skin type is the primary guide. Lactic acid at 5-10% is a practical first step for dry or reactive skin. Glycolic acid at 7% suits normal skin building towards regular exfoliation. A 2% salicylic acid formula addresses oiliness and visible pores. Using glycolic acid with retinol is achievable, though alternating evenings reduces the risk of irritation. SPF is non-negotiable when using AHAs, as sensitivity to UV increases with regular use. Ronaghan's Pharmacy carries a curated selection of AHA and BHA products suited to a range of skin concerns, with the pharmacy team available for guidance on building an effective routine. Always read the label and patient information leaflet, and speak to your pharmacist before use if you have any questions.For physical alternatives and combination formulas, see the wider scrubs and exfoliators range.