How would topical application work, and what kind of homeostasis effect, from ingestion.
If you are low on vitamin c in your diet, sure. If not, you may not get much benefit from having more.
The problem is commercialization. Vitamin C is very, very reactive, so formulating it for shelf storage and production is challenging. I think you either have to add expensive/exotic antioxidant systems, or rely on ascorbate derivatives which may be less/not effective.
Fair warning: Vitamin C degrades to dehydroascorbic acid: After some delay, vitamin C solution may stain skin and everything in contact yellow. DHA may also further break down into erythrulose, a self-tanning agent browning the skin semi-permanently (likely not very healthy). Vitamin C may also react with other things (eg. skin care products) in unpredictable ways and can actually form radicals under some conditions. Eg. It can react with benzoic acid to form benzene. On the modern skin, with UV exposure, a primordial soup of "actives", complex hydrocarbons and all natural metal catalysts, vitamin C may facilitate genesis…
The science is promising, but the chemistry of vitamin C is hard to control, or even reason about.
… hence it oxidises easily.
There has recently been a novel development, ethyl ascorbic acid, that is much more stable due to being more inert. It resists the oxidation for a much longer time compared to ascorbyl glucoside and L-ascorbic acid, and it has been successfully commercialised in some skincare products. The products using it command a premium, though.