I tested and I am dubious on the usefulness. The mask sheet is hydrating. The tissu is of quality. The quantity of serum on the tissu is good. The serum doesn't sting but I don't know if the VB serum is efficient or not. I don't understand its usefulness. I'm tested the effector serum formula10 with the same opinion. Perhaps I must use this mask sheet several times to see a result. The quatity of serum of step 1 is enormous. There are enough serum for 3 maybe 4 uses.
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