Centella asiatica guide: the K-beauty soothing ingredient and what it actually does
A complete guide to centella asiatica (cica) in skincare — the active compounds (madecassoside, asiaticoside), evidence for wound healing and barrier repair, how it calms sensitive skin, and how to use it.
· By MedSpot Editorial · 4 min read
Centella asiatica — sold under names like cica, tiger grass, gotu kola, and TECA — has been a staple of Korean skincare and wound-care medicine for decades. The ingredient has genuine evidence behind it. Here's what it does and doesn't do.
What centella asiatica is
Centella asiatica is a herbaceous plant native to tropical Asia, long used in traditional Ayurvedic and Chinese medicine for wound healing. In modern skincare, it's standardized as an extract containing several active compounds:
The key actioxidants:
- Asiaticoside: A triterpene glycoside that stimulates collagen synthesis and has anti-inflammatory properties
- Madecassoside: A related glycoside; arguably the most potent anti-inflammatory compound in the extract; upregulates antioxidant enzymes
- Asiatic acid: Increases collagen type I synthesis; wound-healing activity
- Madecassic acid: Anti-inflammatory; inhibits inflammatory cytokine production
Different products use different standardized forms:
- TECA (Titrated Extract of Centella asiatica): A standardized pharmaceutical-grade extract — the form used in most clinical wound-healing research; consistent ratios of active compounds
- "Cica" extract / Centella asiatica extract: Cosmetic-grade; variable concentration of actives
The evidence
Wound healing (strongest evidence)
TECA has been used in pharmaceutical wound care since the 1970s. Multiple controlled trials demonstrate:
- Accelerated wound closure and re-epithelialization
- Improved tensile strength of healing tissue
- Reduced scarring — particularly in burn wounds and post-surgical sites
- Mechanism: asiaticoside activates fibroblasts → increased procollagen synthesis + collagen crosslinking + ECM remodeling
Clinical implication: Centella-based products have genuine utility in post-procedure healing (post-laser, post-microneedling, post-peel). This is the best-supported use case with clinical-grade evidence.
Barrier repair and TEWL reduction (good evidence)
Madecassoside in particular reduces TEWL and strengthens the stratum corneum lipid barrier. A 2016 study (Journal of Dermatological Science) demonstrated that 0.1% madecassoside applied to irritant-contact-dermatitis skin significantly reduced TEWL and restored barrier function vs. vehicle control.
Clinical implication: Centella products are genuinely useful for damaged, sensitized, or barrier-disrupted skin — post-retinoid irritation, post-peel recovery, eczema-adjacent sensitivity.
Anti-inflammatory / sensitive skin (well-supported mechanism)
Madecassoside inhibits NF-κB signaling — a master inflammatory pathway — reducing cytokine production in keratinocytes and dermal cells. This mechanism supports its use in:
- Rosacea (reducing background inflammatory response)
- Post-acne inflammation
- Reactive, sensitized skin
Collagen synthesis / anti-aging (moderate evidence)
Asiatic acid and asiaticoside upregulate TGF-β and collagen gene expression in fibroblasts — the same downstream target as retinoids and vitamin C, but through a different receptor pathway. Human skin studies show modest improvement in elasticity and firmness with long-term use.
Realistic expectation: The anti-aging effect of centella is real but modest compared to retinoids. It's better positioned as a skin-calming and barrier-repair ingredient than as a primary anti-aging active.
Forms and what to look for
Madecassoside and asiaticoside listed separately: The highest-activity products list the individual standardized compounds rather than just "centella asiatica extract."
TECA (Titrated Extract): Clinical-grade standardization — best for post-procedure healing.
Centella asiatica water / fermented centella: High-centella toners where the extract is the primary active — common in K-beauty formulations (COSRX Centella Water, Klairs Supple Preparation Toner).
Concentration: Standardized extracts are used at 0.1–1%; whole plant extracts at 1–5%.
Who benefits most
Post-procedure recovery: After laser, microneedling, or peels — centella's wound-healing and barrier-repair activity accelerates recovery and may reduce post-inflammatory redness.
Retinoid irritation management: Layering a centella serum or essence with a retinoid routine (not at the same step — apply centella after retinoid absorption) provides anti-inflammatory counterbalance.
Rosacea-prone and reactive skin: The NF-κB inhibition reduces baseline inflammation without the stimulation risk of actives. Centella is compatible with even the most sensitized skin profiles.
Acne-prone with PIH: Anti-inflammatory properties reduce the post-acne inflammation that drives PIH formation.
How to layer centella products
Centella is compatible with essentially all other skincare actives — there are no significant interactions or incompatibilities. It works well alongside:
- Retinoids (applied after retinoid has absorbed — as a buffer)
- Niacinamide (complementary barrier and anti-inflammatory support)
- AHAs/BHAs (reduces post-exfoliation inflammation)
- SPF (no photosensitization)
Placement: After toner/essence steps, before heavier serums and moisturizers. Can also be used as the final moisturizer if the centella product is a cream.
AM and PM: Centella is appropriate in both routines. No photosensitization.
What centella won't do
- Treat established acne (it reduces inflammation but is not comedolytic or bactericidal at useful concentrations)
- Replace retinoids for anti-aging — the collagen stimulation is real but modest
- Treat hyperpigmentation directly — it reduces the inflammation that causes PIH, but doesn't inhibit melanin synthesis
- Provide the same barrier repair speed as a ceramide-rich moisturizer (though the two are complementary)
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