Why Your Serum Isn't Working
Nine times out of ten it's not the product. It's the order, the timing, or the amount.
Most serums need 4 to 6 weeks before anything is visible. If you've been using one for ten days, it hasn't failed yet.
Order matters more than people expect. Thinnest to thickest: toner, serum, moisturiser, sunscreen. A serum applied over a moisturiser mostly sits on top of it.
And amount — two or three drops is enough for the whole face. More doesn't absorb, it just evaporates.