Mandelic acid is also a fruit acid, but mandelic acid is currently the only fruit acid class of fat-soluble fruit acid mandelic acid molecules than fruit acids in the glycolic acid 2 times larger, so not so stimulating mandelic acid has antibacterial properties, so on the acne help, in addition, there is the inhibition of tyrosine acidase activity, can slow down the melanin production, so there is a whitening effect, but one thing to understand is that, the concentration of fruit acid products is not the only focus, the PH value is the Many maintenance products to add the so-called high concentration, but the fear of users out of the problem, and the PH value to pull up, of course, the effect is not as expected, but the cost of adding a high concentration is certainly the cost of consumers to pay the bill in fact, 5 to 8% is enough, long-term continuous daily use of high-concentration fruit acids to promote the peeling of keratin, and that soon time should be added to the ranks of the sensitive muscle amygdaloid acid, although milder, but the use of or to pay attention to, not everyone is