Lactic acid powder is a versatile Alpha Hydroxy Acid (AHA) used in both skincare and food production. It is often derived from the fermentation of plant-based sugars like corn or beet sugar.
Skincare Benefits
Lactic acid is known as a "gentle giant" compared to other AHAs like glycolic acid because its larger molecular size prevents it from penetrating as deeply, reducing the risk of irritation.
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Gentle Exfoliation: It dissolves the bonds between dead skin cells on the surface, improving texture and tone for those with sensitive or dry skin.
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Deep Hydration: Unlike many acids, lactic acid is a natural humectant that attracts and binds water to the skin, making it excellent for hydrating parched complexions.
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Pigmentation & Anti-Ageing: It helps fade hyperpigmentation, such as melasma and acne scars, while stimulating collagen production to reduce fine lines.
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Body Care: It is frequently used in lotions to treat Keratosis Pilaris ("chicken skin") by smoothing out rough bumps on the arms and thighs.
Food and Industrial Uses
Lactic acid powder (often as a mixture with calcium lactate) is a common food additive (E270).
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Vegan Cheese & Dairy: It provides a signature "tangy" or sour flavor and helps coagulate proteins in vegan cheese and butter substitutes.
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Preservation: It acts as an acidulant and antimicrobial agent, extending the shelf life of baked goods, beverages, and meats.
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Sourdough & Brewing: It is used to lower pH in beer brewing and to enhance the sour flavor profile of sourdough bread.
Safety and Formulation Tips
Pure lactic acid powder is highly acidic and must be handled with care.
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Dilution: Never apply 99% pure powder directly to the skin, as it can cause severe chemical burns and blistering.
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Safe Concentration: For at-home skincare, typical concentrations range from 5% to 10%.
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Ideal pH: Formulations should have a pH between 3.5 and 4.0 to be effective without being overly aggressive.
