BHA / Beta Hydroxy Acid
The only BHA widely used in skincare and the gold standard for acne and congested skin. Oil-soluble — penetrates sebum-filled pores to dissolve plugs and exfoliate pore walls. Dual surface + pore-level action uniquely effective for blackheads, whiteheads and inflammatory acne. At 0.5–1% in cleansers it provides daily maintenance without irritation.
This ingredient works across the 1% line depending on formulation. The higher end of the range should sit above the line; very gentle starter products may use the lower end legitimately.
0.5–2% PM toner, serum or gel. Daily at low dose; 2–3x per week at higher strengths. Leave-on outperforms wash-off. SPF next morning.
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