Potassium Lactate

Potassium lactate is the potassium salt of lactic acid, a naturally occurring alpha hydroxy acid (AHA). In cosmetics, it primarily functions as a humectant, drawing moisture into the skin to keep it hydrated. It can also act as a pH adjuster and a mild exfoliant at higher concentrations.

BenefitGood 2.5 / 4

Hydration i2.5 / 4

Whether the ingredient helps increase the skin’s water content — humectants that attract water, ingredients that reduce water loss, or ones that make skin feel less dry.

Texture i0.8 / 4

Whether it can improve smoothness and surface texture — roughness, flaking, clogged pores, or unevenness. Exfoliating acids, retinoids, and smoothing moisturizers may score here.

Soothing i0.5 / 4

Whether it can calm the skin — linked to less redness, irritation, discomfort, or visible reactivity.

Uv protection i0.2 / 4

Whether it provides direct protection against UV radiation.

RiskLow 0.8 / 4

Irritation i0.8 / 4

Risk of short-term irritation — stinging, burning, dryness, redness, or discomfort. Common for strong actives, acids, retinoids, fragrances, and harsh surfactants.

Sensitization i0.3 / 4

Risk of allergic contact dermatitis or immune-based reactions. Fragrance allergens, preservatives, botanicals, and some dyes may score here.

Systemic exposure i0.1 / 4

Whether it has meaningful potential to be absorbed into the body at levels that may matter biologically. Most cosmetic ingredients score low unless there is known concern or high exposure.

Rated by SpottyLabs' ingredient methodology, independent of brands.

What it helps with

• Hydrates skin
• Supports skin barrier
• pH regulation

Things to watch

• Potential for mild irritation at high concentrations
• May increase sun sensitivity if used as an exfoliant

Be careful combining with

• Aha — Combining with other AHAs may increase the risk of irritation and over-exfoliation.

Products with Potassium Lactate

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Frequently asked questions

Is potassium lactate the same as lactic acid?

Potassium lactate is a salt derived from lactic acid. While lactic acid is known for its exfoliating properties, potassium lactate primarily functions as a humectant and pH adjuster in most cosmetic formulations, offering hydration benefits.