Chlorella Vulgaris Oil: What Is It, Cosmetic Uses, Benefits & Side Effects

Curious about this ingredient? In this article we're explaining exactly what it is and why it's used within cosmetic formulations.
Updated on: June 24, 2025
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We verify all information on this page using publicly available nomenclature standards from The Personal Care Products Council (PCPC), the European Commission's CosIng database and documentation provided directly by ingredient manufacturers. Our analysis is based on technical data from these sources to ensure accuracy and reliability.

What Is Chlorella Vulgaris Oil?

Chlorella Vulgaris Oil is a plant-derived oil pressed from the single-celled green microalga Chlorella vulgaris. The algae grow in fresh water and are prized for their dense concentration of fatty acids, carotenoids, vitamins A and E, chlorophyll and natural antioxidants. Interest in Chlorella began in the mid-20th century when researchers looked to algae as a sustainable nutrient source. As the cosmetic industry shifted toward green technology, formulators discovered that the lipid fraction of Chlorella delivered impressive skin conditioning benefits, so the oil found its way into skincare labs in the early 2000s.

The oil is typically obtained by drying the algal biomass then extracting the lipids through cold pressing or supercritical CO₂. The raw extract may be lightly refined or left virgin depending on the desired sensory profile. Because the algae can be cultivated in closed tanks, the production process is considered eco-friendly and traceable.

Chlorella Vulgaris Oil is now seen in facial oils, moisturizing serums, anti-aging creams, sheet masks, after-sun gels, lip balms, hair conditioners and body lotions where it lends a silky finish and a fresh green marketing story.

Chlorella Vulgaris Oil’s Cosmetic Benefits/Uses

This microalgal oil supports a formula in two main ways:

  • Emollient – its balanced blend of omega-9 and omega-6 fatty acids smooths flaky patches, softens rough texture and enhances the skin’s lipid barrier so moisture loss is reduced after application
  • Humectant – the oil contains polysaccharide residues that bind water to the skin’s surface drawing in ambient moisture and contributing to a plumper more hydrated look

Who Can Use Chlorella Vulgaris Oil

Chlorella Vulgaris Oil is generally suited for normal, dry, mature and sensitive skin because its fatty acids help rebuild the lipid barrier while antioxidants calm redness. Combination and mildly oily skin types often tolerate it as well, provided the rest of the routine is kept lightweight. Those who struggle with very oily or highly acne-prone skin might prefer spot testing the oil within a finished product first since richer lipids can occasionally feel heavy for them.

The oil is entirely plant sourced and is produced without animal derivatives so it fits vegan and vegetarian lifestyles.

There are no published concerns for topical use during pregnancy or breastfeeding. Still, this is not medical advice and anyone who is pregnant or nursing should discuss all skincare products with a doctor to be safe.

Chlorella Vulgaris Oil is not known to cause photosensitivity so it can be used both day and night without increasing sun sensitivity. People with a history of algae or iodine allergy should check ingredient labels attentively as microalgae extracts can sometimes trigger cross reactions.

Potential Side Effects/Adverse Reactions

Side effects from topical Chlorella Vulgaris Oil differ from person to person. The points below list potential issues yet most users will not experience them when the ingredient is properly formulated and stored.

  • Allergic contact dermatitis – rare redness, itching or rash in individuals sensitive to algae derivatives
  • Pore congestion or mild breakout – heavier application on oily zones may trap debris leading to comedones
  • Irritation from oxidized oil – if the product is old or improperly stored the degraded lipids can sting or cause dryness
  • Cross reaction in those with seaweed or iodine allergy – similar proteins may provoke a response
  • Green staining on light fabrics – the chlorophyll pigment can transfer before fully absorbing

If any unwanted reaction occurs stop using the product and seek advice from a healthcare professional or dermatologist.

Comedogenic Rating

Rating: 2 out of 5

Chlorella Vulgaris Oil carries a moderate level of oleic and linoleic acids that melt nicely into skin without the heavy residue linked to highly comedogenic butters. This mid-weight profile means it can clog pores for some very oily users yet remains lighter than many plant oils, so it earns a 2 on the 0-5 scale.

Generally suitable for most acne-prone individuals, though those with persistent congestion may prefer leaner alternatives.

Natural variations in algae strain, growing conditions and refinement can slightly alter the fatty acid balance, which in turn nudges its pore-clogging potential one way or the other.

Summary

Chlorella Vulgaris Oil works mainly as an emollient and humectant. The fatty acids fill in microscopic cracks to soften skin while polysaccharide traces draw in moisture, leaving the surface smooth and comfortably hydrated. Antioxidant vitamins round out the protective package.

Although not as ubiquitous as jojoba or argan, this microalgal oil is gaining traction thanks to its sustainable story and balanced feel, popping up in a growing number of serums, creams and balms.

The ingredient is considered low risk with few reports of sensitivity and no added sun sensitivity. Still, skin can be unpredictable, so doing a quick patch test when you try a new product containing Chlorella Vulgaris Oil is always wise.

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