Why do formulators prefer DL-Mandelic acid over L-Mandelic acid in most products?

DL-Mandelic acid costs less and performs identically to the L-isomer in exfoliation and antibacterial action, so there's little reason to pay extra for the chiral version. The L-form shows slight advantages in some enzyme-mediated reactions, but in topical cosmetics, the racemic mixture delivers the same clinical results-pore clearing, tone evening, and acne control. Synthesis of pure L-Mandelic acid requires enzymatic resolution or chiral catalysts, driving prices 2–4 times higher. (DL-Mandelic acid) stays stable longer in formulas since it lacks the potential for enantiomer-specific degradation. Regulatory bodies treat both as equivalent for cosmetic safety. Many studies on acne and hyperpigmentation use the DL form with no noticeable difference versus L. For budget-conscious brands, DL keeps ingredient costs down without sacrificing efficacy. In peels, the racemic mix gives consistent batch-to-batch results. Unless a specific patent or claim demands the L-isomer, DL remains the practical choice for mass-market and professional lines.