This
one has 0.5% SA. I think the answer is two-fold:
-1- Each ingredient is difficult to work with, for different reasons, so using both in one formulation further complicates things.
-2- What % of each would you be using? If you were planning on say >10% ascorbic acid, then your product would be marketed for one particular function (anti-aging, antioxidant, etc.), and if you’re planning on a full 2% SA, then your product is most likely wanting to boast anti-blemish effects. It might not be an easy “sell” to offer all of this in one item; if you look at the marketplace, consumers are usually asked to choose one or the other in a product: antioxidant/anti-aging or anti-acne. Stated otherwise, I cannot remember the last time I saw a product being promoted as both anti-aging and anti-acne. What you are proposing would not be a bad idea, it would just be a question of how you would want to market the product.