vitamin c and dark spots

2 months is a very long time for Ascorbic Acid to be exposed to air, and you should have already seen results (and ideally finished the product) after a month. It probably has oxidized unfortunately.

I haven’t tried that ampoule, but based on the ingredients it doesn’t look like it would pack the same brightening punch as the product you are currently using. I am surprised you haven’t seen any change after so long though - I’m sorry! Maybe try another vitamin C serum? I know people love the Good Molecules brightening serum and discoloration correcting serum, too, so those could be worth a try 😊 Good luck!