I’m also curious what type of Vit C. Ascorbic? The consensus has various over time; a person person states ascorbic could be the worst, Some others say ascorbic is ok, Other individuals say Vit C can not be absorbed through skin to extend collagen but can have a brightening result. https://7figurebm.com/how-to-make-vitamin-c-serum-from-orange-peel/