Hyaluronic Acid

In your 40s IF YOU USE ONE PRODUCT, MAKE IT:

Hormonal changes in this decade can affect your skin’s oil production, which can make it look drier and less than healthy. ‘Add in more moisturising products to fortify your skin with hydration,’ says Dr Hartman. ‘Hyaluronic acid will add water content. Then use a moisturiser to seal it in.’

Our pick: Vichy Minéral 89 Fortifying And Plumping Daily Booster, £25