Please allow me to comment -
L-ascorbic acid If it is in a formula with pH 2-3, it has a slower oxidation rate than pH 3-4, but it can be very irritating to the skin. - Increasing the stability of
L-ascorbic acid when working with
Vitamin E (alpha-
Tocopherol ),
Ferulic Acid and
Vitamin C will enhance skin's ability to reduce UVA damage, while
Vitamin E will help reduce the damage caused by UVB. Using a product containing these two vitamins will enhance the effectiveness of sunscreen. -
Citric Acid can increase the stability of
L-ascorbic acid by acting as both
สารกันเสีย and anti-oxidation in the formula. palmitic acid in the formula can reduce the deterioration of
Vitamin C - Using
Propylene Glycol in the formula to reduce the degradation of
Vitamin C Yes - packed in a tea-colored dropper bottle. When activated, it will be exposed to light and air often, will cause Oxidize until it turns yellow quickly. The proper packaging is probably an opaque squeeze tube. or an opaque pump bottle to reduce the chance of
Vitamin C is exposed to light and air often. should maintain the quality of
Vitamin C longer, thank you.