Cosmetics Formulation Development

If you want to make a scrub, use the formula: coffee grounds, tamarind เชียร์บัตเตอร์ I have to add a preservative? If so, please suggest a name. Substance and quantity please.

Hello, the important parts are coffee grounds and tamarind. how it came and sterilized by which method and whether there are any residual bacteria test results If you pass this step can choose to use Phenoxyethanol SA 1% Are you infected? If you don't pass the first step, enter สารกันเสีย , however, it does control infection. I'm not here