A natural AHA (Alpha Hydroxy Acid), THE INKEY LIST Lactic Acid is derived from milk and fruit sugars. It acts as an exfoliant, helping to gently loosen and remove dead skin cells from the skin\'s surface for a more even skin tone and brighter complexion. More gentle than other AHAs, Lactic Acid has moisturising properties for smooth, soft skin. Lactic Acid acts to: - Target uneven skin tone - Even skin tone - Brighten skin tone - Reduce the appearance of wrinkles  INKEY Info: - 10% Lactic Acid for gentle exfoliation - 1% Low molecular hyaluronic acid for deeper hydration beneath the skin surface - Suitable for all skin types. Lactic acid retains moisture whilst exfoliating so is great for dry or dehydrated skin. How to use Acids - Acids aren\'t scary, they\'re a gentle and effective way to exfoliate the skin, but as with everything you need to ensure you\'re choosing the one that\'s right for you. Here\'s a few tips from THE INKEY LIST. - Lactic Acid is the gentlest of all of the AHAs, making it perfect for those with more sensitive skin. If you\'re new to AHAs it is a good place to start. INKEY would advise starting with every other night to begin with. Due to its exfoliating and skin renewing properties, it can aid deeper penetration of the serums you apply afterwards. How quickly the skin renews itself is dependent on age and whilst you may see some instant effects from the product, you should see the full effect within 30 days of beginning use. How to use with other products: AHAs can be combined with most other products, however there are a few to be careful with to ensure you don\'t sensitise the skin. - When combining with a Vitamin C serum. Both are amazing ingredients that can help with healthy looking skin, however it would be best to use Vitamin C in the AM and Lactic Acid in the PM. The acidic PH of both could lead to increased sensitivity and irritation if used together. Vitamin C works best in the AM due to its antioxidant properties. - Always wear sunscreen when using Alpha Hydroxy. Due to exfoliating properties of AHA, and the fact it increases skin renewal, this means that the top layer of skin is newer, and therefore potentially more sensitive to sunlight, so INKEY would always recommend using in PM and wearing sunscreen during the day whilst using this product and for 7 days after. - Using with a Retinol. If you are also using a retinol product in your evening routine, and want to add an acid we suggest using acids weekly or if you want to use your acid more regularly alternating with retinol. If you do wish to use both on the same day, due to PH levels INKEY would recommend waiting around 20 minutes before applying your retinol and be careful of overuse as both increase skin renewal and may cause sensitivity. - Using with other AHAs. INKEY would recommend only using one AHA at a time (this includes Glycolic, Alpha Hydroxy and Lactic acids). Whilst they can have slightly different benefits you can have too much of a good thing and over exfoliation can lead to increased sensitivity.