Cosmetics Formulation Development

Hello, I want to ask about Vitamin C (L-ascorbic acid) (Ultra-Fine) 1. Vitamin C (L-ascorbic acid) (Ultra-Fine) originated or synthesized from what? 2. Vitamin C (L-ascorbic acid) (Ultra-Fine) in the development of a successful formula, is there a prohibition, do not use it with anything? 3. To use Vitamin C Why do you feel the heat on your face? Then should I stop using it? 4. Then Vitamin C (L-ascorbic acid) (Ultra- Fine) in pregnant or lactating people, can it be used? Thank you.

Hello. 1. Synthetic by chemical process. 2. Please check the instructions for use. On the product detail page. 3. Please inform all formula components. 4. Can be used.