Hello, I don't have the formula
สารกันเสีย recommend
Mild Preserved Eco 1%, the formula can be mixed. but not suitable for beginners Because it will need to use heat to help dissolve.
DPHP which is in the oil section. for efficiency The formula should be able to help.
ลดริ้วรอย for a period of at least 30 days in a row, using twice a day.