Cosmetics Formulation Development

Hello, I would like to ask if I use 1, 3 Propanediol is a solvent. Mild Preserved Eco for serum watery formula If so, what ratio must be used? and the use to mix 1% serum based on the already dissolved mixture Or before mixing the solvent, if not, use Butylene Glycol can I substitute it? What ratio do you mix? will use Mild Preserved Eco in It's a 0.9% formula.

Hello, the team thinks that the usage rate is 1,3- Propanediol or Butylene Glycol that can help dissolve Mild Preserved Eco with water. can The rate is quite high. which may be as high as 10% or more, so it is not suitable The study team recommends choosing Phenoxyethanol SA instead. 1,3- Propanediol or Butylene Glycol 3-5% level may be used Phenoxyethanol SA only 0.5% which is very gentle, because 1,3- Propanediol or Butylene Glycol will increase the efficiency of สารกันเสีย Please send to the Department of Medical Sciences to check the infection to ensure that the selection สารกันเสีย This format is powerful enough for the formula.

thank you very much