Enriched with a higher concentrate of Vitamin C, the glo therapeutics 15% Vitamin C Serum (30ml) intensely reduces the signs of ageing by stimulating collagen production, which helps to smooth out fine lines and wrinkles while firming the skin. Suitable for all skin types, the formula also works to even skin tone and repair and protect from sun damage and free radicals; a main cause of ageing. - K.R Directions for use: Apply every morning before moisturising. Allow serum to fully absorb into the skin before applying your moisturiser of choice.