Hello. Usually, if the ingredients used together does not contain any ingredients that can irritate the skin [all 3 ingredients that members ask about No items that irritate the skin] can use the full rate that the manufacturer / FDA. can be determined at all, but if the ingredients used together It is an ingredient that can irritate the skin. For example, there are many popular brands to choose from.
Trans-White (Use no more than 3%) together with
Activated Resorcinol (use up to 1%) and
Alpha Arbutin (use no more than 2%) because of the three ingredients that have this skin-brightening effect. can irritate the skin Therefore, the usage rate should be reduced. to reduce the chance of skin irritation For example, it may be reduced to only half or only 1/3 from the normal maximum rate.