Vitamin C Ester (Ascorbyl Palmitate) Stability in Cream pH 4-5

Regarding your question about the stability of Vitamin C Ester (Ascorbyl Palmitate) in a cream with a pH of 4-5, the information provided by the staff is correct.

Vitamin C Ester (Ascorbyl Palmitate) is an oil-soluble form of Vitamin C. Unlike water-soluble forms of Vitamin C (like L-Ascorbic Acid), its stability is not significantly affected by the pH of the water phase in an emulsion (such as a cream or lotion), provided it is properly dissolved in the oil phase of the formulation.

Therefore, formulating a cream with Vitamin C Ester at a pH between 4 and 5 should not pose a stability issue for the Vitamin C Ester itself due to the pH level, as it resides in the oil phase.

For best results when formulating with Vitamin C Ester:

• Mix it into the oil phase of your formulation.
• Use a temperature of around 70°C during the oil phase mixing to help it dissolve properly.
• Consider using antioxidants like Protec™ OX or Protect™ UV in the formula to further protect the Vitamin C Ester from deterioration.

Remember that the raw ingredient Vitamin C Ester (Ascorbyl Palmitate, Enzymatic) should be stored properly at 7-10°C, tightly closed, and protected from the sun to maintain its quality before use.