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Cassia Alata Leaf Extract

INCI: CASSIA ALATA LEAF EXTRACT

Reviewed by Kate · Last updated 14 Aug 2026

A plant extract with purifying and antioxidant properties, traditionally used in skincare

Best For Skin Types

Oily, Combination, Acne-prone

Addresses

Acne, Oil control, Free radical damage

Usage Frequency

Daily

What Is Cassia Alata Leaf Extract?

Cassia alata leaf extract is derived from the leaves of Cassia alata, a tropical plant native to Southeast Asia. The extract contains phenolic compounds and flavonoids that contribute to its antimicrobial and antioxidant activity.

In skincare formulations, it functions primarily as an astringent, which means it may help to tighten or tone the skin. The extract's antimicrobial properties have been demonstrated in laboratory studies, though its efficacy in finished skincare products at typical concentrations remains less well-established in human trials.

How It Works

The extract's antimicrobial effects appear to stem from its phytochemical composition, particularly phenolic and flavonoid compounds. These molecules can interact with bacterial cell structures, though the concentration and formulation of the extract in a finished product will affect how these properties translate in real-world use.

Its antioxidant mechanism involves neutralising free radicals generated by sun exposure and environmental stress, potentially reducing oxidative stress in the skin. The astringent effect is thought to work through the action of tannins and related compounds that may cause temporary contraction of skin tissue.

Clinical Evidence & References

In vitro studies have shown that Cassia alata leaf extracts exhibit antimicrobial activity against Staphylococcus aureus, a bacterium implicated in skin infections. Research has also identified significant antioxidant and free radical scavenging activity in the plant extract, along with some anti-tyrosinase activity, which may be relevant to hyperpigmentation concerns.

However, evidence from controlled human studies on the ingredient's effectiveness in cosmetic formulations is limited. Most available data comes from laboratory testing rather than clinical trials on living skin, so the practical benefit at typical skincare concentrations warrants further investigation.

How to Use

Cassia alata leaf extract is found in relatively few skincare products (roughly 0.1% of formulations), so it is not yet a mainstream ingredient. When present, it is typically used in serums, toners or targeted treatments. Use as directed on the product label, and introduce it gradually if you have sensitive skin to assess tolerance.

Safety & Precautions

No significant safety concerns have been reported with topical use of Cassia alata leaf extract in skincare products. As with any new ingredient, patch testing is advisable if you have reactive or sensitive skin.

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