Clinical Studies Using Soy Kang et al conducted a clinical study of the effects of the soy isoflavone, genistein, in healthy subjects. After pretreatment with genistein and exposure to UV radiation, investigators keratomed or biopsied the skin for analysis. Pretreatment with genistein inhibited both ERK activity by 60% (P<0.05) and reduced UV induction of cJun protein by 70% (P<0.05). Johnson & Johnson conducted a 12-week, randomized, double-blind, vehicle-controlled study of 68 subjects, 63 of whom completed the study. At week 12, mottled hyperpigmentation improved at least 1 grade in 28 of 31 (90%) of the soy-treated group, compared to 17 out of 32 subjects (53%) in the vehicle group (based on clinical evaluation, colorimetry, and digital photography) (P≤0.05).Safety of Soy Isoflavones Topically applied soy isoflavones are well-tolerated. Because the inhibition of melanosome transfer by soybean trypsin inhibitor is reversible, side effects are minimal. 1 During the trial described above, erythema, dryness, itching, and burning/stinging did not change from baseline to final follow-up, although one subject in the control group developed mild contact dermatitis.
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