where do you buy L-ascorbic Acid 15% serum

[kayah]

like here:
Majik

that's the cheapest my friend found in the States and she tested it
hae we in UK got similarily priced product?

so far the cheapest I've found was around £25/5 ml

ascorbic acid = vitamin C. So maybe just look out for brands that do a vitamin C moisturising range. I think quite a lot of high st brands and upmarket brands do too.

yes, but is about the concentration (15%)