Centella Asiatica (Cica): The Clinical Evidence Review

Centella asiatica, the plant behind every "cica" product on the shelf, has more peer-reviewed skin research than most people realize. This review walks through what the clinical evidence actually shows for wound healing, the skin barrier, redness, scars, and aging, plus the concentrations that matter and how to use it. The goal is simple: be the most honest, citation-backed guide to one ingredient.

What Centella asiatica Actually Is

Centella asiatica is a small, leafy herb that grows in wetlands across Asia. In traditional medicine it's gone by names like gotu kola and tiger grass. In skincare, you'll see it on labels as "Centella asiatica extract," "cica," or as one of its purified parts.

That last point matters more than the marketing. The whole-plant extract is a mix. The action comes mostly from four molecules, grouped together and called TECA (titrated extract of Centella asiatica) or CAST (Centella asiatica selected triterpenes):

Asiaticoside
Madecassoside
Asiatic acid
Madecassic acid

The first two are saponins (larger sugar-linked molecules). The last two are their "acid" forms. Together these triterpenes do the heavy lifting in the studies. When you read a cica label, the real question is whether it contains a standardized, concentrated triterpene fraction or just a vague "extract" that could be mostly water and filler.

One more thing worth knowing. The four molecules aren't interchangeable. Asiaticoside and asiatic acid show up most in the collagen and wound-healing research. Madecassoside is the one studied hardest for inflammation and UV protection. So two "cica" products with the same percentage on the label can behave differently depending on which triterpenes dominate. A serum standardized to madecassoside leans soothing and protective. One built around asiaticoside leans toward repair and firming. Most quality formulas include all four, but the marketing rarely tells you the ratio.

Centella also has a long paper trail. It's been studied for skin and wounds for decades, first in traditional medicine and then in modern pharmacology. That history is part of why it earns trust: the safety profile is well mapped, and the basic biology is no longer a mystery. What's still being worked out is how much of the lab promise carries over to a cream you buy at the store, which is exactly the gap this review tries to be honest about.

How It Works on Skin

Centella isn't a single-target ingredient like a retinoid. It nudges several skin processes at once. Here's the mechanism in plain terms, drawn from lab and animal work summarized in the wound-healing literature.

It pushes fibroblasts to make collagen. Asiaticoside and asiatic acid signal skin cells (fibroblasts) to produce more type I and type III collagen. More collagen means firmer skin and stronger new tissue in a healing wound. This is the most studied effect and shows up across asiaticoside collagen studies.

It calms inflammation. Madecassoside in particular dials down inflammatory signals (cytokines like TNF-alpha and IL-6) and tames overactive immune responses. That's why cica products are marketed for angry, reactive, post-procedure skin.

It fights oxidative stress. The triterpenes boost the skin's own antioxidant defenses and mop up free radicals from UV and pollution. A 2026 study found madecassoside protected skin cells from a specific kind of UVB-driven cell death called ferroptosis (Madecassoside and UVB, Phytomedicine 2026, PMID 41421280).

It supports the skin barrier. Cica helps the outer layer hold water and stay intact. That's the link to its use in dry, cracked, eczema-prone skin.

It improves blood flow in the skin. Centella has a long history of use for vein and circulation problems, and that same effect supports skin. Better microcirculation in a wound bed means more oxygen and nutrients reach healing tissue. In skincare terms, it's part of why the plant shows up in products aimed at dull, tired-looking skin.

So the simple version: Centella builds, calms, and protects, with a side of better circulation. That combination is why it's useful for so many different concerns.

A quick word on what mechanism does and doesn't prove. A lot of this biology comes from cell cultures and animal wounds, where you can deliver a clean dose straight to the tissue. Your skin is a tougher gatekeeper. The outer layer is designed to keep things out, so the amount of triterpene that actually reaches living skin cells from a cream is far smaller than what a lab dish gets. That's the honest reason mechanism and real-world results don't always line up, and why the evidence grades below matter more than the impressive lab data.

The Clinical Evidence by Concern

Here's where honesty matters. The research quality varies a lot by use. Some uses have decent human trials. Others lean on animal and lab data and a leap of faith. The table below grades each one.

Concern	What the evidence shows	Typical form/strength	Evidence strength
Wound healing	Faster closure, stronger new tissue; strongest research area	TECA 1% ointment, oral triterpenes	Moderate–Strong
Scars (including keloid/hypertrophic)	Helps soften and prevent raised scars in several trials	TECA cream/oral	Moderate
Skin barrier / dryness	Improves hydration and barrier function	0.1–5% extract creams	Moderate
Eczema / atopic dermatitis	Reduces itch and redness as a support, not a cure	Cica creams, often with ceramides	Limited–Moderate
Redness / sensitivity / rosacea-type	Soothes; widely used post-procedure	Cica serums/creams	Limited (mostly indirect)
Stretch marks (striae)	Mixed; prevention better than treatment	Centella creams in pregnancy studies	Limited
Anti-aging / wrinkles	Boosts collagen in lab; human wrinkle data thinner	Madecassoside 0.1% serums	Limited–Moderate
Hyperpigmentation	Antioxidant support only; not a true brightening active	Any	Weak

Wound Healing: The Strongest Case

This is Centella's home turf. Decades of wound-healing research show the triterpenes speed up wound closure, increase the strength of new tissue, and improve blood vessel formation in the healing area. Much of the foundational work is in animals and lab dishes, but the consistency is impressive, and TECA-based products have a long history of medical use for minor wounds and post-surgical skin.

A few effects show up again and again across these studies. New skin cells migrate across the wound faster. The fibroblasts that lay down collagen become more active. Tiny new blood vessels form to feed the area. And the wound contracts and closes sooner. No single study proves all of this in humans at once, but the direction is consistent enough that TECA-based ointments have been used medically for minor wounds for a long time.

Practical takeaway: if you've had a procedure (microneedling, a peel, laser) and your provider clears it, a cica cream is a reasonable choice to support recovery. Just don't apply it to an open or weeping wound without medical guidance, and follow your provider's aftercare first.

Scars: Prevention Beats Treatment

Several trials have looked at Centella triterpenes for raised scars, including keloid and hypertrophic scars, in the scar-focused literature. The pattern: it works better at preventing a scar from getting thick and raised than at flattening one that already formed. The collagen-organizing effect seems to keep healing more orderly. It's not a replacement for silicone gel or in-office scar treatments, but it's a low-risk add-on.

Why might it help with scars when it boosts collagen? It sounds backward, since raised scars are too much collagen. The likely answer is balance. Centella seems to encourage well-organized collagen rather than the chaotic overgrowth you see in keloids, and it also nudges the breakdown of excess collagen through enzymes the skin already uses. So it's less "more collagen" and more "better-organized healing." For raised scars from acne specifically, topical Centella is a mild support at best. The real fixes there are in-office, which we cover in our best in-office treatments for acne scars guide.

Skin Barrier and Dryness

Cica earns its "barrier repair" reputation here. Studies on Centella extracts show improved skin hydration and better barrier function, measured by reduced water loss through the skin. That measurement, transepidermal water loss, is the standard way researchers judge whether a barrier is doing its job. When it drops, the skin is holding water better.

Centella seems to help in two ways. It supports the skin's production of the lipids and proteins that hold the outer layer together, and its anti-inflammatory side calms the low-grade irritation that keeps a damaged barrier from healing. The two effects feed each other: less inflammation means faster repair, and a stronger barrier means less inflammation. This is why dermatologists often fold cica into barrier-repair routines alongside ceramides. If you want a fuller barrier protocol, see our dermatologist barrier repair routine.

Eczema and Atopic Dermatitis

A 2026 review in Biomolecules & Therapeutics singled out Centella asiatica among medicinal plants with phytotherapeutic potential for atopic dermatitis (PMID 42059025), pointing to its anti-inflammatory and barrier effects. Real-world cica creams often pair Centella with ceramides and panthenol, so it's hard to credit Centella alone. Treat it as a helpful support ingredient for itchy, inflamed skin, not a stand-alone treatment. Anyone with active eczema should still see a dermatologist.

Redness, Sensitivity, and Post-Procedure Skin

This is the most popular use and, ironically, the one with the thinnest dedicated trial data. The logic is sound: Centella is anti-inflammatory and supports healing, so it should calm reactive skin. Most of the support is indirect, pulled from its wound and barrier research. It's gentle and rarely irritating, which is exactly what stressed skin needs.

People often reach for cica during flares, after sunburn, or when a new retinoid has left their skin raw. The anecdotal track record is strong, and the mechanism backs it up, but be clear-eyed: there aren't many large, controlled trials testing cica head-to-head for redness alone. For true rosacea, Centella may soothe symptoms but won't treat the underlying condition the way prescription options can. For a broader sensitive-skin approach, see our best dermatologist routines for sensitive skin.

Stretch Marks

Some Centella creams have been tested for preventing stretch marks in pregnancy, with mixed results. A few studies suggest it may lower the odds of developing new marks in people prone to them. Treating marks that already exist is much harder, and the data there is weak. Set expectations accordingly.

Anti-Aging

Centella clearly boosts collagen production in the lab, and a 2026 Nutrients paper described its "geroprotective" potential to modulate cellular aging (PMID 42280293). Topical madecassoside serums (often 0.1%) have shown some firmness and elasticity benefit in human studies, supported by its antioxidant activity in skin.

There are two pieces to the anti-aging story. The collagen-building side is real and well documented in the lab, which over time could mean firmer skin. The antioxidant side helps defend against the daily UV and pollution damage that ages skin in the first place. Both matter. But it's not a retinoid. Retinoids have far more human wrinkle data and a stronger, faster effect. The smart play is to think of Centella as a supporting antioxidant and barrier ingredient that lets you tolerate a retinoid better, not as a wrinkle eraser on its own. For the heavy hitters, see our retinoids and actives complete guide.

Hyperpigmentation

Be honest here: Centella is not a real brightening active. It doesn't block melanin the way tranexamic acid, azelaic acid, or kojic acid do. Its antioxidant effect may slightly help prevent UV-driven pigment, but if dark spots are your concern, reach for a dedicated ingredient instead.

Concentrations and What to Look For

There's no single "magic" percentage, because products list Centella in different ways. Here's how to read a label.

Label term	What it usually means	Notes
"Centella asiatica extract"	Whole-plant extract, strength varies	Vague; could be weak
"TECA" / "CAST"	Standardized triterpene blend	The form used in studies
"Madecassoside 0.1%"	One purified triterpene	Common in anti-aging serums
"Asiaticoside"	Another purified triterpene	Strong wound/collagen data
"Cica"	Marketing term, not a dose	Check the actual INCI list

A few practical rules:

Standardized beats vague. A product naming TECA, CAST, or a specific triterpene at a stated percentage is more trustworthy than a generic "extract."
Position on the ingredient list matters. If Centella is near the bottom, after a long list of fillers, there may not be much in there.
Madecassoside around 0.1% is a common, research-supported level for leave-on serums.
TECA near 1% is typical for wound and scar ointments.

It's also worth knowing that "more" isn't automatically "better" with Centella. The studies don't show a clean dose-response where doubling the percentage doubles the benefit, and very high concentrations are more likely to trigger a reaction in sensitive people. A well-formulated product at a modest, standardized level usually beats a poorly made one that just shouts a big number on the front of the bottle. The supporting ingredients matter too. Centella paired with ceramides, panthenol, or niacinamide tends to outperform Centella floating in a basic gel, because those partners shore up the same barrier and soothing pathways.

Who Should Use It

Centella is one of the most broadly tolerated actives, which makes it easy to recommend.

Great fit for:

Sensitive, reactive, or easily flushed skin
Compromised or over-exfoliated barriers
Post-procedure recovery (with provider approval)
Anyone layering strong actives like retinoids or acids who needs a calming buffer

Less ideal as a solo fix for:

Stubborn dark spots (use a real pigment ingredient)
Deep wrinkles (use a retinoid)
Active, severe eczema (see a doctor)

How It Compares to Alternatives

Centella overlaps with several popular soothing and barrier ingredients. Knowing the differences helps you build a routine without doubling up.

Ingredient	Main strength	How it differs from Centella
Niacinamide	Barrier, oil, tone	More versatile; weaker wound data. See our niacinamide evidence review
Panthenol	Hydration, soothing	Simpler humectant; less collagen action
Allantoin	Soothing, smoothing	Milder; minimal collagen effect
Ceramides	Barrier rebuilding	Structural lipids, not anti-inflammatory
Madecassoside (alone)	Purified Centella	Same family, more targeted and consistent

The short version: Centella is the standout when you want soothing plus a real push toward repair and collagen. For pure hydration, panthenol or ceramides may be enough. They also pair well together, which is why so many cica creams stack all of them.

Side Effects and Safety

Centella has a strong safety record on skin. Most people use it with no issue. Still, a few honest caveats:

Allergic contact dermatitis is uncommon but documented, usually to the triterpenes themselves. If you get redness or itching from a cica product, stop using it.
Patch test any new product, especially if your skin is reactive. Apply a small amount to your inner arm for a few days first.
Oral gotu kola supplements are a different story from topical use and have their own cautions (including liver concerns at high doses). This article is about topical skincare only.
Pregnancy: topical Centella is generally considered low-risk, but check with your doctor before starting anything new while pregnant.

How to Use It

Centella plays well with almost everything, so fitting it in is easy.

Morning or night? Either works. Many people use a cica serum or cream in the morning under sunscreen and again at night.

Where in the routine? After cleansing and any water-based serums, before heavier creams. If you use a thin cica serum, apply it early; if it's a rich cica cream, use it as your moisturizer step.

Pairing with actives: Centella is a great buffer. Apply it before or after a retinoid to cut irritation. It layers fine with vitamin C, niacinamide, and acids. There are no real conflicts to worry about.

A simple soothing routine:

Gentle cleanser
Cica serum (madecassoside or TECA)
Moisturizer with ceramides
Sunscreen (morning)

How long until you see results? Calming and hydration can show within days. Barrier repair takes a few weeks. Collagen and scar benefits are slow, think two to three months of consistent use.

Serum or cream? A serum gets you a higher, more concentrated dose of the actives and absorbs fast, which suits oily or normal skin and works well under other products. A cream gives you the same actives plus the occlusion and lipids that dry or compromised skin needs. If you can only buy one and your skin runs dry or sensitive, the cream is usually the better value. If you layer a lot of products, the serum slots in more easily.

Common mistakes to avoid:

Treating cica as a brightening or acne-clearing active. It's a soother and repairer, not a pigment or pore ingredient.
Buying on the word "cica" alone without checking the ingredient list for a real, standardized triterpene.
Expecting overnight results on scars or wrinkles. Those are slow wins.
Stacking five soothing products at once. One good cica step is plenty; piling on more just adds cost and potential reactions.

Storing it well: the antioxidant compounds degrade with light and air, so opaque or airless packaging keeps a Centella product effective longer than a clear jar. Keep the lid closed and don't leave it on a sunny windowsill.

Frequently Asked Questions

Is cica the same as Centella asiatica?

Yes, basically. "Cica" is a nickname brands use for products built around Centella asiatica. The active compounds are the same. Just check the ingredient list to see whether it contains a standardized triterpene blend (TECA, CAST, or named madecassoside/asiaticoside) or only a vague "extract."

Can I use Centella asiatica every day?

Yes. It's one of the gentlest actives in skincare and is meant for daily use. Many people apply it twice a day. As always, patch test a new product first and stop if you notice irritation.

Does Centella asiatica help with acne?

Indirectly. It doesn't kill acne bacteria or unclog pores the way salicylic acid or a retinoid does, so it won't clear breakouts on its own. But its anti-inflammatory effect can calm the redness around active pimples and support healing, which is why it's often paired with stronger acne actives.

Will cica fade my dark spots?

Not really. Centella is not a true brightening ingredient. It doesn't block melanin like tranexamic acid, azelaic acid, or kojic acid. Its antioxidant action may slightly help prevent new sun-driven pigment, but for existing dark spots you'll want a dedicated pigment-fighting ingredient.

Can I use Centella with retinol?

Yes, and it's a smart pairing. Centella calms the irritation, dryness, and redness that retinol can cause. You can layer a cica product before or after your retinoid, or simply use it on the nights or mornings when your skin feels most sensitive.

This article is for educational purposes only and is not medical advice. Talk to a dermatologist about your specific skin concerns before starting any new product.