246 JOURNAL OF COSMETIC SCIENCE Table II Concentration of Glycolic and Lactic Acid, and pH, in Salon Products Alpha hydroxy Concentration Concentration Occurrence acid avg. (%) range (%) frequency Average pH • pH • range Glycolic acid Lactic acid 10.5 0.9-28.5 16 of 17 3.3 4.0 1.0-14.0 5 of 17 3.6 1.3•4.6 3.2•4.2 1Neat. Table III Recovery of GIycolic and Lactic Acids From Two Consumer Cosmetic Products Amount added I Amount added (%) (mg/ml) Amount found (mg/ml) Recovery (%) Trial 1 Trial 2 Trial 1 Trial 2 Mean GIycolic Acid Product 1 Product 2 Lactic acid Product 1 Product 2 1.53 0.523 0.546 0.539 104 104 104 1.65 0.523 0.548 0.536 105 103 104 1.57 0.537 0.525 0.504 98 94 96 1.70 0.537 0.531 0.552 99 103 101 • As a percentage of sample weight. Table IV Recovery of Glycolic and Lactic Acids From a Salon Product Amount found (mg/ml) Recovery (%) Amount added • Amount added (%) (mg/ml) Trial 1 Trial 2 Trial 1 Trial 2 Mean Glycolic acid Lactic acid 1.71 0.51 0.48 0.54 94 106 100 3.25 1.02 1.00 0.99 98 97 98 9.49 2.93 2.90 2.85 99 97 98 12.2 3.78 3.89 103 103 14.88 4.47 4.35 97 97 1.85 0.55 0.55 100 100 3.53 1.11 1.14 1.14 103 103 103 12.9 3.97 4.12 4.09 104 103 104 12.1 3.65 3.71 102 102 16.5 5.13 5.39 105 105 • As a percentage of sample weight. CIR. About half of the consumer products either contained a sunscreen (five products) or a recommendation for the use of a sunscreen (eight products). None of the salon products contained a sunscreen and only two contained a recommendation on the prod- uct label for the use of a sunscreen. The FDA plans to continue monitoring AHAs in consumer products and salon style professional products. The FDA is also continuing to assess the safety of long-term use of AHA products.

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