Hi. I made a recipe of 15%
ascorbic acid and 0.5%
Ferulic and 1%
L-Glutathione Reduced (Extrasol) with 30% Glycols of
Ethoxydiglycol and
Propanediol . The final PH is 3.1-3.4 and the preservative is
Phenoxyethanol &
Ethylhexylglycerin . At first, it is quite difficult to dissolve Extrasol completely without high shear. After a few weeks, it started to have some clear crystals in the bottom and the crystals became bigger and bigger over time. Why is it happening? How to dissolve Extrasol well? If I raise PH to 4.5, it dissolves very well and fast. Thank you.