Hello. 1. Ingredients as informed by members. Can mix together in the same formula. 2. I don't understand the question. 3. Please read
มือใหม่กรุณาอ่านที่นี่ 4. The efficiency of each ingredient's work It depends on the user's skin. therefore cannot be directly compared. With the important variable is the user's skin. In the case of developing a formula for your own use It is recommended to test each ingredient. to see which ingredients have a better effect on your skin In the case of formula development for distribution Usually it is popular to wear several. but reducing the rate of use of each of them in order to be effective for most users Instead of choosing just one ingredient which may not be effective for some users