Hi,

Was wondering which is the best for fragile skin under the eyes?

CP night eye premiere or superghk formula?

Thanks.

GHK copper for very fragile skin. But start the GHK copper very lightly.

How do I know if my skin is very fragile or not? I know it's thin but what is the hallmark for sensitive skin?

Sensitive skin may have stinging from the copper peptides. If so, just use less and go slower.