Thanks for your response. Our supplier recommended to add the Dermosoft 1388 in the water phase prior adding other ingredients. But still, I experience crystallization but not as big as the previous crystals. Any other options?
I agree with Perry. In our case, we conduct stability testing ourselves (micro test included). As for the challenge test, we also seek for assitance from our suppliers. Some of them are free of charge, some are not.
@Perry my apologies for wrong info. Glycerin can be partially or totally replaced by Betaine as it has the same moisturizing effect, based on the study made by DuPont. Pros of betaine is it isn't tacky/sticky.