No. 1 Serum

No. 1 Serum by Mutha is catalogued as a skincare product. Order matters in a routine: thinner, water-based textures go on before richer creams and oils, or the layers underneath never land. Patch test on the inner arm or along the jaw first, especially if you are already using retinoids, acids or vitamin C. Discounted listings come and go, and rarely at the same shop twice. Check the period-after-opening symbol on the pack; once opened, a formula is on a shorter clock than the printed expiry. Add delivery to the cheapest price and you will see whether it is genuinely the best deal.