Phaeodactylum Tricornutum Oil

Phaeodactylum tricornutum oil is derived from a marine microalga—a single-celled organism found in ocean waters. The oil is extracted from these microalgae and used in skincare for its conditioning properties. It functions primarily as an emollient, meaning it helps to soften and smooth the skin surface.As a sustainable alternative to some traditional plant and animal-derived oils, this ingredient reflects a broader movement towards lower-impact sourcing in cosmetics. The oil contains fatty acids and other lipid compounds that can help maintain skin's moisture barrier.

The oil works primarily through occlusion and emollient action. When applied to skin, it forms a protective layer that reduces transepidermal water loss—the evaporation of moisture from the skin's surface. This helps to keep the stratum corneum (outer layer) hydrated.The fatty acids present in the oil interact with the skin's lipid matrix, the natural fats that hold skin cells together. By supplementing these lipids, the ingredient helps maintain barrier integrity and skin texture.

This ingredient is typically found in oils, serums, and moisturisers. It works well in layered routines—apply to damp skin and seal with a heavier moisturiser if needed, or use alone if your skin tolerates oils well. As with any new product, patch test first, especially if you have reactive or sensitive skin.

Generally well-tolerated, though allergic contact dermatitis is possible as with any ingredient. Those with sensitivity to marine-derived ingredients should patch test first.