What Centella asiatica is

Centella asiatica (L.) Urban is a creeping perennial in the Apiaceae family, widespread across southern China, India, South-East Asia and Madagascar, and known colloquially as gotu kola, Indian pennywort or tiger herb. It has a long history of traditional use; its entry into modern cosmetics rests on research into its triterpene saponins.

Cosmetics rarely use the raw herb. They use extracts made with different solvents, or further-purified single actives. These two routes differ in INCI name, price and formulation behavior:

• Whole extract: usually listed as CENTELLA ASIATICA EXTRACT (sometimes with the extraction solvent as a suffix). Keeps the full saponin profile and co-extractives; darker in colour with a distinct odour, cost-effective, and well suited to a "botanical soothing" story.
• Standardised extract: titrated to total saponins or a specific marker (commonly TECA-type grades, i.e. a titrated extract of asiaticoside, asiatic acid and madecassoside). Better batch consistency and quantifiable actives at a higher price.
• Single actives: such as MADECASSOSIDE or ASIATICOSIDE. High purity, pale colour, faint odour, suited to premium serums and "high-purity" claims — at a significantly higher cost.

Physico-chemically, common extracts are water- or polyol-soluble mixtures with a broad molecular-weight distribution, a yellow-to-brown colour and a characteristic herbal odour. What procurement should police is not "what percentage" but the marker assay method and batch-to-batch consistency.

Ingredient fact box

How it works, plainly

Think of Centella as doing three jobs for the eye area: calm, rebuild, clean up. All three pathways have in-vitro and some human support, but the strength of evidence differs sharply and should be treated separately.

• Calm (soothing the look of discomfort): madecassoside and asiaticoside are the most studied, with most evidence from in-vitro cell and animal models showing effects on mediators linked to discomfort responses. Translated to what a consumer perceives: "the redness looks less obvious, the stinging has eased" — note this is a look-and-feel statement, not a pharmacological one.
• Rebuild (barrier support): Centella extract helps maintain skin hydration and supports the integrity of the stratum corneum. Since periorbital skin is thin and its barrier is fragile to begin with, this pathway contributes most to "why my eye area feels better", and it is what consumers actually describe back to you.
• Clean up (antioxidant): the triterpene saponins together with co-extracted polyphenols scavenge certain reactive oxygen species, and show synergy alongside vitamin E and green tea polyphenols.

An honest caveat: much of the anti-inflammatory and repair data for Centella comes from animal models and in-vitro work, and a number of historical studies used oral dosing or very high topical concentrations that cannot be directly converted to real-world exposure from a leave-on cosmetic. Independent, large-scale, long-term human evidence for the periorbital area remains limited. Search PubMed for "Centella asiatica", "madecassoside" and "asiaticoside" to review the primary literature yourself. Claims should therefore read "helps soothe" or "helps reduce the look of redness" — never "anti-inflammatory", "treats dermatitis" or "repairs damage".

Best-fitting formats

Use level and formulation notes (verify by bench trial)

Common reference level: 0.5%–5% as a standard extract, with most soothing eye formulas landing at 1%–3%. For grades standardised to total saponins (TECA-type) or single actives such as madecassoside, convert using the active content on the supplier COA — the effective level is usually much lower.

• Colour is gate #1. Whole extracts run yellow to yellow-brown; at higher levels they visibly tint white creams or clear gels. Fix it with a decolourised grade, a switch to a single active, or a base shade (e.g. a sand-toned cream) that absorbs it.
• Odour is gate #2. The characteristic herbal note is easily noticed in eye-area products. Fix it with a low-odour grade, a very light botanical fragrance (assess eye tolerance first), or a lower level of a high-purity active.
• Solubility and precipitation. Ethanolic grades can haze or precipitate when dropped straight into water; propylene glycol, glycerin and butylene glycol systems are more forgiving — pre-dissolve and add cold.
• Ionic compatibility. Co-extracted ions can depress viscosity in carbomer and similar polymer systems; run accelerated checks on viscosity and appearance.
• pH: generally hold 5.0–7.0; strongly acidic or alkaline conditions hydrolyse the saponins.
• Preservation and microbiology. Botanical extracts typically arrive with a higher initial microbial load than synthetics — enforce incoming raw-material testing and pass a preservative challenge test.
• Stability protocol. 40 °C for 3 months, freeze–thaw (−15 °C ↔ 40 °C, ≥3 cycles) and light exposure, watching specifically for colour drift, odour change and marker-content decay.

The figures above are common reference levels for eye care formulas; the actual use level is set by the formulation engineer based on dosage form, compatibility and target-market rules. Permitted use conditions, limits and labelling requirements differ by market — complete a compliance review for each destination before shipment. All descriptions here are general cosmetic applications and appearance or skin-feel statements, not medical advice or efficacy guarantees.

Compliance and market notes (verify per target market)

• China: Centella asiatica extract has relevant entries in the Inventory of Existing Cosmetic Ingredients in China (2021 edition); before use verify the entry and historical maximum use level against the specific plant part, extraction solvent and grade, and comply with the Cosmetic Supervision and Administration Regulation, cosmetic labelling rules and efficacy-claim evaluation rules.
• EU (EC) No 1223/2009: confirm the grade's listing status in EU COSING and declare the botanical name, plant part and extraction solvent accurately in the CPNP notification, PIF and CPSR. Claims must meet the Common Criteria for Cosmetic Claims, (EU) No 655/2013.
• US MoCRA (2022): facility registration, product listing, safety substantiation, adverse-event reporting and record-keeping apply, with labelling under the FD&C Act and relevant 21 CFR provisions. Cosmetics do not undergo pre-market approval — never write "FDA approved".
• Claim red lines: "anti-inflammatory", "anti-allergy", "treats dermatitis" and "repairs a damaged barrier" sit in medical or pharmacological territory; use "helps soothe", "helps reduce the look of redness" and "supports the skin barrier" instead.
• Pesticides and heavy metals: request pesticide residue, heavy metal and residual solvent reports for botanical extracts — brand owners in the EU and North America routinely ask for them.
• Japan / Korea / Middle East: each follows its own cosmetic or quasi-drug pathway — verify per target market.

Ingredient pairings

• Centella + panthenol (1%–3%): the classic soothing-plus-hydration pairing and the default base for sensitive-skin eye patches and masks — also the most stable combination to formulate.
• Centella + ceramides (0.5%–2%): soothing and barrier support complement each other, ideal for gentle "every day, long term" lines and among the strongest directions for repeat purchase.
• Centella + caffeine (1%–2%): a soothing base with help for the look of puffiness — well suited to "late-night rescue" patches, and it noticeably lowers the irritation risk from cooling agents.
• Centella + sodium hyaluronate (0.1%–0.5%): hydration layered onto soothing for a strong immediate feel; ideal for masks and gels.
• Use with care: high ethanol, menthol or camphor works against a soothing position and may increase periorbital discomfort; combining with low-pH AHA systems requires re-checking saponin stability. Also, a product claiming "soothing" while carrying a high fragrance load contradicts its own positioning.

Formulation pairing cards

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