Kiehl's Ultra Pure High-Potency Serum 9.8% Glycolic Acid, 30ml at John Lewis & Partners

What it is: A concentrated facial serum formulated with just seven ingredients to help step up your smoothness by visibly refining your skin’s texture and minimising the appearance of pores.

Who it’s for: All skin types, including sensitive.

What it does: With 9.8% Glycolic Acid, this serum is formulated with just seven ingredients to help visibly refine and smooth skin’s texture and minimise the look of imperfections. Free of fragrance and colourants, this concentrated serum is minimally formulated for skin absorption and smoothing effect.