Milk
INCI: MILK
Reviewed by Kate · Last updated 14 Aug 2026
A natural humectant that helps skin retain moisture and maintain softness
Best For Skin Types
All, Dry, Sensitive
Addresses
Usage Frequency
Daily
What Is Milk?
Milk is a natural substance derived from dairy sources, commonly used in skincare as a skin conditioning agent. It contains lactose, proteins, and fats that work together to support skin hydration and texture.
In formulations, milk functions primarily as a humectant — a substance that draws water into the skin and helps it remain there, contributing to a softer, more supple feel.
How It Works
Milk works by drawing moisture into the outer layers of the skin through its humectant properties. Its proteins and fats also sit on the skin surface, providing an emollient effect that helps prevent transepidermal water loss — essentially keeping moisture in rather than letting it evaporate.
Clinical Evidence & References
Milk is a well-established cosmetic ingredient, though specific clinical studies evaluating its topical skincare effects are limited in the published literature. Its use in skincare is supported primarily by its composition and its long history of use in traditional beauty preparations.
Most evidence for milk's benefits comes from its known chemical profile rather than rigorous clinical trials. More research would help establish optimal concentrations and specific efficacy claims for different skin concerns.
How to Use
Milk-containing products can be used as part of a daily routine, typically in cleansers, moisturisers, or specialised treatments. Since milk concentration in skincare products is usually low, tolerance is generally good. If using a milk-based product for the first time, apply to a small area first to ensure compatibility with your skin.
Safety & Precautions
Frequently Asked Questions
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