Micrococcus Lysate
INCI: MICROCOCCUS LYSATE
Reviewed by Kate · Last updated 2 Jun 2026
A fermented bacterial lysate that conditions and supports skin barrier function
Best For Skin Types
All, Dry, Sensitive, Combination
Addresses
Usage Frequency
Daily
What Is Micrococcus Lysate?
Micrococcus Lysate is a fermentation-derived ingredient produced from lysed (broken-down) micrococcus bacteria. The fermentation process breaks down the bacterial cells, releasing their bioactive compounds into a liquid extract that can be incorporated into skincare formulations.
In cosmetics, it functions primarily as a skin conditioning agent. The lysate contains amino acids, peptides, and other small molecular compounds that are thought to support the skin's natural moisture retention and barrier resilience. It is used in a small proportion of skincare products, typically in serums and moisturisers.
How It Works
Micrococcus Lysate works through multiple pathways. The amino acids and small peptides it contains can be absorbed into the stratum corneum (the skin's outermost layer), where they contribute to the natural moisturising factor—compounds that help skin bind and retain water. This improves hydration and skin softness.
Additionally, fermented ingredients often contain metabolic byproducts with antioxidant and anti-inflammatory properties. These may help protect skin from oxidative stress and support the skin's natural repair processes, though the magnitude of these effects is modest compared to standalone actives like vitamin C or niacinamide.
Clinical Evidence & References
Published research specifically on Micrococcus Lysate in skincare is limited. Most evidence comes from formulators' testing and company-sponsored studies rather than independent peer-reviewed research. This does not necessarily mean the ingredient is ineffective—many established cosmetic ingredients have modest evidence bases—but it does mean claims should be interpreted cautiously.
The ingredient appears to be safe and well-tolerated in formulations. Its conditioning effects are consistent with what would be expected from an amino acid and peptide blend. It is most useful as a complementary hydrating and barrier-supporting agent rather than a primary treatment for specific skin concerns.
How to Use
Micrococcus Lysate is typically found in leave-on products such as serums, essences, and moisturisers, where it can remain in contact with the skin to deliver its conditioning benefits. It is best used as part of a consistent skincare routine rather than as an occasional treatment. Layer it under or blend it with your regular moisturiser for optimal hydration. There is no evidence that higher concentrations deliver proportionally better results, so standard formulations will be sufficient.
Safety & Precautions
Frequently Asked Questions
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