Fig. 4From: Improvement of the pharmacological activity of menthol via enzymatic β-anomer-selective glycosylationTopical testing of (−)-menthol β-d-glucoside and (−)-menthol on the inside of the forearm. The cooling effect on the skin was determined using a topical test that scored the cooling intensity on a scale from 0 (no effect) to 5 (very strong)Back to article page