Ive never used vitamin c before, so i did some research to see some vitamin c serums for beginners but mostly they said its not as effective as an advanced vitamin c serum, so could i just use an advanced one instead?

Using Advanced Vit C serum as a vit c beginner

Is it okay if i dont store my vitamin c serum in the fridge, if yes, then what are different ways to make it not oxidised aside from keeping it in the fridge?

Not storing Vitamin C serum in fridge

I've been looking EVERYWHERE for this serum in my country but unfortunately, they don't sell any so its kind of hard....so any dupes that are the same as this serum? If so then pls recommend thankss!!

h3art3yes