centella asiatica: what tiger grass actually does
updated july 2026
If you've ever seen "cica" on a Korean skincare label, you've met Centella asiatica. It's a small wetland herb from South and Southeast Asia with a very good origin story and, more importantly, real chemistry behind it.
what is centella asiatica?
Centella asiatica is a low-growing wetland herb native to South and Southeast Asia, used in traditional Indian and Chinese skincare for centuries and now a staple of "cica" cosmetics. In modern formulas it's valued as a soothing, well-tolerated ingredient - the calm note that makes a product feel gentle on reactive or blemish-prone skin.
why is it called tiger grass?
The nickname "tiger grass" comes from an old observation: injured tigers were said to roll in patches of centella. Whether or not the tigers knew their botany, traditional medicine in India and China used the plant on skin for generations before cosmetic chemists caught up and isolated the compounds behind the folklore.
which molecules do the actual work?
Centella's activity comes from a family of compounds called triterpenes - madecassoside, asiaticoside, and asiatic acid are the ones on studied labels. A 2021 review in Evidence-Based Complementary and Alternative Medicine maps these triterpenes to anti-inflammatory and wound-repair pathways, which is why they're associated with a calmer look and support for a healthy-looking skin barrier.
One frequently cited randomized double-blind study (Haftek et al., 2008) paired 0.1% madecassoside with 5% vitamin C over six months in 20 volunteers and reported measurable improvement in skin firmness, suppleness and hydration, alongside a more normally structured elastic-fibre network. It's a photoaging study, so read it as evidence for the ingredient family's skin credentials rather than a blemish claim.
can centella help the look of a blemish?
Centella is there for the appearance of redness, not to erase a spot. In lab work, madecassoside has shown soothing potential: a 2019 cell study (Shen et al.) found it lowered the pro-inflammatory signals IL-1B and NF-kB in P. acnes-stimulated human cells while supporting hydration markers. That's test-tube evidence for why the ingredient reads as calming - not proof a patch treats acne.
why put centella in a hydrocolloid patch?
A spot that's busy being a spot tends to look red and feel angry. Centella adds a soothing note under the occlusive calm of the hydrocolloid, and it's famously well-tolerated - which matters when an ingredient sits on one point of skin for eight hours. The hydrocolloid gel does the absorbing; centella just makes the area look less dramatic.
No miracle claims here: centella won't erase a blemish. It just helps the area look less dramatic while the patch does the heavy lifting - which, some nights, is exactly what you want.