Chlorella Sp. Ksf0031 Extract: 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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All information on this page is verified using publicly available nomenclature standards and reference materials from The Personal Care Products Council (PCPC) and the European Commission's CosIng database. Our analyses are based on technical data from these sources to ensure accuracy and reliability.

What Is Chlorella Sp. Ksf0031 Extract?

Chlorella Sp. Ksf0031 Extract comes from a single-cell green alga that is grown in controlled tanks to keep it free from pollutants. Once the algae reach the right density they are harvested, rinsed and gently broken open so their inner nutrients can be collected. Water or a mix of water and food-grade solvents pulls out proteins, polysaccharides, vitamins, minerals and natural antioxidants such as carotenoids and chlorophyll. The liquid is then filtered, concentrated and standardized to make sure every batch offers the same skin benefits.

Microalgae have been studied since the mid-20th century for their nutrition profile, but interest in their topical use rose in the 1990s when Korean and Japanese formulators looked for plant-based actives that could boost skin vitality. Chlorella Sp. Ksf0031, a strain selected for its high antioxidant content, soon found its way into cosmetic labs. Today you will spot this extract in lightweight serums, hydrating creams, sheet masks, barrier-repair lotions, after-sun gels and anti-aging blends where brands want a botanical that soothes and reinforces the skin.

Chlorella Sp. Ksf0031 Extract’s Cosmetic Benefits/Uses

This marine-derived ingredient earns its spot in formulas thanks to two key functions

  • Skin Conditioning: The blend of amino acids, sugars and vitamins helps attract and hold water on the surface, leaving skin feeling smooth, supple and refreshed. Over time it can improve overall texture and give a healthier-looking glow.
  • Skin Protecting: Antioxidants such as chlorophyll and carotenoids help neutralize environmental stressors like pollution particles and daily UV exposure which can weaken the skin barrier. By defending against these aggressors the extract supports stronger more resilient skin.

Who Can Use Chlorella Sp. Ksf0031 Extract

Because it is lightweight, non greasy and packed with gentle hydrators, Chlorella Sp. Ksf0031 Extract agrees with most skin types including dry, normal, combination, oily and even sensitive skin. Those with known algae allergies or who are extremely reactive to botanical extracts should proceed with caution, but otherwise there are no major class-specific red flags.

The ingredient is cultivated from microalgae and involves no animal derivatives, making it suitable for vegans and vegetarians.

Current data do not flag the extract as problematic for pregnant or breastfeeding women when applied to intact skin. Still, this is not medical advice and anyone expecting or nursing should clear new skincare products with a qualified healthcare provider first to be on the safe side.

Chlorella Sp. Ksf0031 Extract does not increase photosensitivity. In fact its antioxidant content may help buffer the effects of everyday sun exposure, though it is not a substitute for sunscreen.

Potential Side Effects/Adverse Reactions

Side effects from topical use of Chlorella Sp. Ksf0031 Extract differ from person to person. The following issues are possible, yet they remain uncommon when the ingredient is used correctly by reputable manufacturers.

  • Mild redness or stinging during initial applications
  • Localized irritation in individuals with very sensitive skin
  • Allergic contact dermatitis in people allergic to algae or botanical actives
  • Temporary green tint on skin or fabrics if product contains a high concentration of chlorophyll
  • Breakdown and odor change if the finished product is stored poorly leading to secondary irritation

If any of these reactions occur discontinue use and consult a healthcare professional.

Comedogenic Rating

Rating: 1/5

Chlorella Sp. Ksf0031 Extract is primarily a water soluble blend of proteins, sugars and antioxidants with very little oil or wax content, which means it has a minimal tendency to block pores. Formulas that feature it are usually lightweight serums, gels or lotions that rinse or absorb easily, further lowering the chance of buildup.

Because of this low rating it is generally considered suitable for skin that is prone to acne or breakouts. The only caveat is that the finished product’s overall recipe matters more than any single ingredient, so heavy creams that also contain butters or comedogenic oils could still trigger congestion.

One extra note: if a product uses a high load of the extract and keeps more chlorophyll for a “green” marketing look, that plant pigment can sometimes settle into pores on very oily skin though it usually washes away without issue.

Summary

Chlorella Sp. Ksf0031 Extract conditions and protects the skin by delivering moisture binding amino acids and sugars while its natural antioxidants help defend against daily environmental stress. These combined actions leave skin feeling smoother, more resilient and lit with a healthy looking glow.

Although not as famous as heavy hitters like hyaluronic acid or niacinamide the extract is gaining quiet popularity among clean beauty and K-beauty brands that want a plant based multitasker.

Available safety data shows low irritation potential, no links to hormone disruption and a very small risk of allergy confined mostly to those already sensitive to algae. As with any new skincare product it is smart to do a quick patch test first just to make sure your skin agrees with the formula.

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