Centella asiatica is one of the most well-supported botanical ingredients in skincare. Its active compounds stimulate collagen production, calm inflammation, strengthen the skin barrier, and speed up wound healing. Unlike many trending plant extracts with thin evidence behind them, centella has decades of research across cell studies, animal models, and human trials showing real effects on skin health.
How Centella Works on Skin
Centella asiatica contains four key active compounds that do the heavy lifting. Two of them, asiaticoside and madecassoside, are the primary drivers of the plant’s skin benefits. The other two, asiatic acid and madecassic acid, play supporting roles. Together, these compounds influence multiple pathways in the skin simultaneously: they trigger collagen production, dial down inflammatory signals, protect against oxidative damage, and promote the migration and growth of new skin cells.
This multi-target activity is part of what makes centella unusually versatile. Most skincare actives do one thing well. Centella does several things at once, which is why it shows up in products targeting everything from acne to aging to sensitive skin.
Collagen Production and Wound Healing
The benefit with the strongest evidence is centella’s ability to boost collagen synthesis. Studies on human skin cells (dermal fibroblasts) show that centella extracts increase production of both type I and type III collagen, the two types most important for skin structure and elasticity. Type I collagen provides firmness, while type III is critical during wound repair and gives skin its flexibility. Centella raises production of both at the gene level and the protein level.
The mechanism works through a specific growth factor pathway. Centella’s active compounds stimulate a signaling molecule called TGF-β1, which tells fibroblasts to multiply and produce more of the structural proteins that make up the skin’s scaffolding. This doesn’t just help existing skin stay firm. It actively accelerates the repair process when skin is damaged, promoting cell migration, attachment, and growth at the wound site. Animal studies confirm that both topical application and oral administration of centella compounds speed burn wound healing and enhance collagen deposition.
Calming Inflammation and Redness
Centella is a strong anti-inflammatory, which is why it’s become a staple ingredient in products for sensitive, reactive, or acne-prone skin. Madecassoside specifically blocks the production of IL-1β, one of the key inflammatory molecules your skin releases in response to irritation or bacterial activity. It also suppresses NF-κB, a master switch that controls the broader inflammatory cascade in skin cells.
This matters for acne in particular. When acne bacteria trigger inflammation in your pores, the resulting redness, swelling, and tissue damage are driven largely by these same inflammatory signals. By interrupting them, centella can reduce the severity of breakouts and limit the collateral damage that leads to post-acne marks and scarring. Research shows these anti-inflammatory effects extend to other conditions too, including atopic dermatitis (eczema) and general skin irritation.
Skin Barrier and Hydration
A double-blind clinical trial on workers regularly exposed to chemical irritants found that four weeks of centella application significantly improved skin hydration, measured on both the palm and the back of the hand. The treatment also improved skin pH, which is a marker of barrier health. These workers were at high risk for contact dermatitis from occupational exposure, and centella helped protect their skin barrier against that damage.
Separate research confirms these barrier benefits through a different measure: transepidermal water loss (TEWL), which tracks how much moisture escapes through the skin. Centella extracts reduce TEWL, meaning your skin holds onto water more effectively. If your skin tends to feel tight, dry, or easily irritated, a compromised barrier is often the underlying issue, and centella directly addresses it.
Protection Against UV Aging
A recent animal study provided the first comprehensive look at how oral centella extract protects against UV-induced photoaging. Mice given a standardized centella extract showed significantly less wrinkle formation after UV exposure compared to controls. The extract also reduced oxidative stress markers, preserved collagen levels, maintained skin hydration and elasticity, and lowered inflammatory compounds in the skin. These effects happened simultaneously, suggesting centella works against photoaging on multiple fronts rather than just one.
This doesn’t mean centella replaces sunscreen. But it does suggest that centella, whether applied topically or taken orally, can help skin resist the cumulative damage from UV exposure that leads to fine lines, loss of elasticity, and uneven texture over time.
What to Look for in Products
Clinical studies on topical centella formulations have used extract concentrations of 2.5% and 5%, applied twice daily for four weeks, with measurable improvements in hydration, barrier function, and inflammation at both concentrations. The dried extracts used in these studies contained about 10% active compounds (a mix of the four key triterpenes), which is a useful benchmark when evaluating product quality.
You’ll see centella listed on ingredient labels under several names: Centella asiatica extract, cica (a common abbreviation in Korean skincare), or sometimes as isolated compounds like madecassoside or asiaticoside. Products labeled “CICA” typically contain the whole extract. Some formulations isolate specific compounds, but research suggests the full extract works well because the active compounds complement each other. The glycoside forms, asiaticoside and madecassoside, are recognized as the main active constituents responsible for wound healing and repair benefits.
Centella pairs well with other soothing and repair-focused ingredients. Its calming properties make it a natural companion for potentially irritating actives like retinoids or exfoliating acids, where it can help buffer the irritation those ingredients sometimes cause. It also works alongside ceramides, which was the combination tested in the barrier-repair clinical trial on workers exposed to chemical irritants.
Safety and Potential Reactions
Centella asiatica is classified as a weak sensitizer, meaning allergic reactions are rare but not impossible. Cases of allergic contact dermatitis from centella have been documented, though they remain uncommon given how widely the ingredient is used. If you have a history of plant allergies or very reactive skin, patch testing a new centella product on a small area of your inner forearm for a few days before applying it to your face is a reasonable precaution.
For the vast majority of people, centella is exceptionally well tolerated. Its anti-inflammatory and barrier-strengthening properties actually make it one of the gentler active ingredients available, suitable for daily use and compatible with most skin types, including sensitive and acne-prone skin.