2. Helps with breakouts and acne scars

Lactic acid accelerates skin turnover, promoting renewal. “This process not only reveals fresher and more youthful-looking skin but also helps to unclog pores, which can be beneficial for treating whiteheads, blackheads and acne pimples,” Dr Phillips notes.

3. Boosts hydration

Lactic acid is also a powerful humectant, meaning it helps to attract and draw moisture into the skin to keep it hydrated.

4. Supports the skin barrier

“Lactic acid has been shown to enhance the skin barrier function by increasing the production of ceramides, which help to maintain a waterproof skin barrier, reducing loss of moisture from the skin,” says Dr Phillips.

5. Stimulates the production of collagen

“Additionally, lactic acid can stimulate the production of collagen and structural molecules called glycosaminoglycans (GAGS), resulting in firmer and plumper skin with fewer fine lines and wrinkles,” he adds.

6. Fade signs of discolouration

Dark spots and patches of uneven skin tone are the result of your skin cells producing excess pigment. Triggers include sun exposure, hormonal changes, inflammation and acne scars. According to Paula Begoun, founder of Paula’s Choice, concentrations of 5-12% lactic acid help to fade signs of discolouration by speeding up the shedding and renewal of these cells on the skin’s surface.

Can you use lactic acid every day?

“Lactic acid can be used daily; however, if you are experiencing dryness, redness or irritation, you will need to use smaller quantities or use it less frequently,” says consultant dermatologist Dr Magnus Lynch.

Also, take note of what other ingredients you’re using and “avoid using multiple exfoliating acids [such as salicylic acid and glycolic acid] in the same routine as lactic acid unless they have been formulated to work together,” says Dr Phillips.

What’s the best way to use lactic acid for skin?

Available in cleansers, exfoliators, serums and creams, lactic acid can easily be incorporated into your daily skincare routine. For lactic acid first-timers, seek out a product with a low strength (around 5% – 10%) and slowly work your way up. Start by using it one to three times a week to build tolerance and increase frequency only if there is zero redness or irritation.