Ideal for retinol beginners and long-term users alike, Neutrogena’s Retinol Boost Serum leaves skin with a youthful-looking bounce and glow. The lightweight, silky serum visibly plumps and brightens to help reduce the appearance of multiple visible signs of ageing: fine lines, dark spots, pigmentation, and a loss of firmness. Alongside pure retinol, the serum combines herbal extracts of myrtle to enhance the efficacy of the vitamin A derivative, while hyaluronic acid locks in moisture for long-lasting hydrating and plumping effects. Fine lines are visibly smoothed and skin appears more radiant. INSTANTLY*: smooths the skin and improves texture (+29%**) IN 1 WEEK*: softens fine lines (-22%), skin appears clearer (+23%) and more radiant (+20%) IN 4 WEEKS*: pigmentation spots are reduced (-32%) and signs of sun damage are improved (+15%) IN 8 WEEKS*: evens skin tone (+35%), reduces the look of fine lines (-43%), skin is more glowing (+40%) *Clinical grading on 31 women over 8 weeks, once a day usage. **Average % improvement