Axis y dark spot serum and Goodal vit c together in one routine?

Yes ✅ They can be layered!

They are safe to use together but there are some people who don't tolerate niacinamide+ vitamin C in the same routine so it's better to try on a small area the first time

Yes those product are compatible and can be used together.

If your skin can tolerate it, yes

Why not ? Both are to target PIH, hyperpigmentation and there are no irritating ingredients apart from essential oils