In use, recommend 5% and up to 10% without causing allergic reactions or skin irritation. For example, *** put วิตามินบี3 5% per 100g total weight. But if making a 1000g cream or lotion, you will need to enter วิตามินบี3 how many grams?
Ask about adding various extracts in facial cream formulas. For example, the formula is 100g. Enter สารสกัดแตงกวา , aloe vera extract, สารสกัดชะเอมเทศ , the combined use rate of the extract is not more than how many %?
