Lactis Proteinum
INCI: LACTIS PROTEINUM
Reviewed by Kate · Last updated 2 Jun 2026
A milk-derived protein that conditions both skin and hair
Best For Skin Types
All, Dry, Mature
Addresses
Usage Frequency
Daily
What Is Lactis Proteinum?
Lactis Proteinum is a protein derived from milk. In skincare and haircare formulations, it functions as a conditioning agent—a substance designed to improve texture, softness and moisture retention in the outer layers of skin and hair.
Milk proteins have been used in cosmetics for centuries, valued for their film-forming properties and ability to coat the skin and hair shaft, creating a smoother surface.
How It Works
Proteins work by forming a thin, flexible layer on the skin or hair surface. This coating helps to seal in moisture and creates a smoother feel, which can improve the overall appearance and tactile quality of both skin and hair.
The protein molecules are large enough to remain on the surface rather than penetrating deeply, making them effective as a conditioning rather than deeply nourishing ingredient.
Clinical Evidence & References
Evidence specifically addressing Lactis Proteinum in skincare is limited. Most research on milk proteins in general suggests they offer mild conditioning and moisturising benefits, though the research base is not extensive.
In haircare, milk proteins are well-established as conditioning agents, but studies specific to this ingredient are sparse. Its benefit appears most relevant as a supportive conditioning ingredient rather than as a treatment for specific skin concerns.
How to Use
Lactis Proteinum is typically found in creams, lotions and conditioners at low concentrations. It works best as part of a balanced formulation rather than as a standalone treatment. Use as directed on the product label, whether that is daily or as needed for conditioning benefits.
Safety & Precautions
Frequently Asked Questions
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