Emollient

Aurantiochytrium Limacinum Oil

INCI: AURANTIOCHYTRIUM LIMACINUM OIL

Reviewed by Kate · Last updated 2 Jun 2026

Also known as: Aurantiochytrium Limacinum Oil

A lightweight marine oil that conditions and smooths the skin barrier

Best For Skin Types

All, Dry, Mature

Addresses

Dryness, Barrier repair

Usage Frequency

Daily

What Is Aurantiochytrium Limacinum Oil?

Aurantiochytrium limacinum oil is derived from a species of marine microorganism (a heterotrophic protist). It is rich in omega-3 and omega-6 polyunsaturated fatty acids, along with squalene, making it a natural emollient with a light, non-greasy texture.

In skincare, it functions primarily as a skin conditioner and emollient, helping to soften the skin and improve its feel. Its lightweight profile makes it suitable for use in formulations where a nourishing but non-occlusive oil is desired.

How It Works

Aurantiochytrium limacinum oil works by depositing a thin film of lipids onto the skin surface. Its polyunsaturated and monounsaturated fatty acids mimic natural skin lipids, allowing them to integrate into the stratum corneum and help maintain hydration.

Unlike heavier occlusive oils, its lightweight composition means it absorbs readily without leaving a prolonged greasy feel, making it useful for layering with other products or for use on combination skin types.

Clinical Evidence & References

Published research specifically addressing Aurantiochytrium limacinum oil in skincare is limited. However, marine-derived oils with similar fatty acid profiles (rich in omega-3 and omega-6) have shown promise in supporting skin barrier function and reducing transepidermal water loss in some studies.

The ingredient is generally recognised as a safe and effective emollient in cosmetic formulations, though more targeted clinical studies would help clarify its specific benefits for different skin concerns.

How to Use

This ingredient is typically found in serums, oils, creams and body care products. If using a product containing this oil, apply to damp skin to enhance hydration, and allow a minute or two for absorption before applying additional layers. It can generally be used daily as part of your routine, morning or evening.

Safety & Precautions

Aurantiochytrium limacinum oil is well-tolerated and has no known significant safety concerns at typical cosmetic concentrations. Those with shellfish or seafood allergies should check product labelling, though the risk is generally considered low.

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