Remember those legendary milk baths Cleopatra was infamous for indulging in? There’s a reason they worked so well. Bathing in sour milk, according to folklore,, was a recipe for beauty, as well as healing and rejuvenation—and that’s all thanks to lactic acid. When milk sours, the bacteria turn lactose into lactic acid, which is a water-soluble alpha hydroxy acid that exfoliates the surface of the skin to reveal a smoother, more luminous complexion,
What are the benefits of lactic acid?
Belonging to the alpha hydroxy acid (AHA) family, lactic acid can be found naturally in dairy products, fermented foods and even sourdough bread. It is what gives yoghurt, buttermilk and cheeses like cheddar, feta and goat their characteristic tangy flavour. However, the lactic acid used in skincare is typically derived from fermenting sugars.
AHAs like lactic acid are actives–a key ingredient with targeted benefits–that are known for their exfoliating prowess. Unlike harsh physical scrubs, lactic acid gently dissolves the proteins which bond dead skin cells together. This exfoliating action not only brightens the skin but blurs out acne scarring, hyperpigmentation and uneven skin tone.
Other benefits of lactic acid for the skin include: (1) It is a mild exfoliant suitable for sensitive skin; (2) It is a humectant known to promote the production of ceramides—the skin’s natural moisturising factors; (3) It maintains the skin’s firmness and elasticity by stimulating a collagen synthesis; and (4) It reduces fine lines, wrinkles to improve the skin’s texture.
How to add lactic acid to your routine
If luxuriating in milk baths like Cleopatra feels as absurdly impractical and indulgent to you as it does us, add any of these Tira-loved skincare products with lactic acid to your routine:
Skivia Lactic & Hyaluronic Acid Face Serum:
This serum combines the exfoliating power of lactic acid with the hydrating properties of hyaluronic acid.
Deconstruct 5% Lactic Acid + 1.5% Probiotics Beginners Exfoliating Serum:
If you're new to the world of exfoliating acids, this beginner-friendly serum is a perfect choice.
Minimalist 10% Lactic Acid Face Serum for Acne Scars Even Tone & Texture:
This potent serum is designed to target stubborn acne scars and deliver an even skin tone.
Earth Rhythm 10% Lactic Acid Intensive Renewal Serum:
Packed with a higher concentration of lactic acid, this serum is perfect for experienced users looking to supercharge their exfoliation game.
St. Botanica Aha Lactic Acid 10% & Hyaluronic Acid 1% Gentle Exfoliating Skin Peel:
A gentle yet effective exfoliating peel that combines lactic acid with hyaluronic acid to reveal a smoother complexion.
Where to take precautions with lactic acid use
While lactic acid is generally well-tolerated by most skin types, it’s still recommended to use it with caution.
- Perform a patch test by applying a small amount on a sensitive part, such as the inner forearm, and wait for 24 hours to check for signs of irritation, redness or allergic reactions.
- Start slowly, if you’re new to lactic acid, with lower concentrations (10% or less) or milder formulations. This will allow your skin to get accustomed to the exfoliating effects of the product.
- Frequent your use of lactic acid according to your skin’s tolerance. Once or twice a week is advised for beginners. Over time, this can be increased to two to four times per week.
- Increased sensitivity to the sun is one of the by-products of lactic acid. Be sure to lather on a broad-spectrum sunscreen with a high SPF to prevent damage from UV rays.
- Avoid mixing lactic acid with other active ingredients like retinoids or Vitamin C that, when used in the same routine, are likely to lead to over-exfoliation and irritation.
