skinChemists Retinol Facial Serum is a potent nighttime treatment designed to combat visible signs of ageing, formulated with Retinol to promote smoother skin texture and a more even tone. This serum, which helps to reduce the appearance of fine lines and wrinkles while supporting improved skin firmness and elasticity, should be applied as a pea-sized amount to clean skin in the evening, followed by a moisturiser, and requires the daily use of sunscreen. product is manufactured by skinChemists, an anti-ageing skincare company based in London, England.