Cica: what madecassoside actually does to your skin

A jar of cream marked “cica” tells you almost nothing. The word is shorthand for centella asiatica, a creeping plant from the Asian subcontinent that has been used in Ayurvedic wound care for centuries. Korean skincare picked it up about fifteen years ago and built half a category around it. The marketing language has been vague ever since. Calming. Soothing. Healing.

The chemistry is not vague. Cica’s clinical effects come from four specific molecules, all triterpenoids, and they each act on a different cellular pathway. According to a 2022 review in the Journal of Cosmetic Dermatology, the active fraction is the same in every well-extracted preparation: asiaticoside, madecassoside, asiatic acid, and madecassic acid. What differs between products is how much of each molecule actually makes it into the formula and onto skin.

The four molecules and what they each do

Asiaticoside is the headline triterpenoid. Its primary action, documented across multiple in-vitro studies, is the inhibition of NF-kB, a master inflammatory signaling pathway. When NF-kB is active, skin cells produce inflammatory cytokines (TNF-alpha, interleukin-6, interleukin-1β) that drive redness, sensitivity, and barrier breakdown. Asiaticoside dampens that signal at the source. The effect on skin reads as reduced redness within hours and reduced reactivity over weeks.

Madecassoside is structurally related to asiaticoside, with one extra hydroxyl group, and that small difference matters. The hydroxyl makes madecassoside more water-soluble, which means it’s easier to dissolve into the water-phase of a serum or essence at concentrations that actually do something. As Chemist Confessions put it bluntly, madecassoside is the molecule most cica formulations lean on, simply because it can be delivered in usable quantities. It does most of the same anti-inflammatory work as asiaticoside, just with better formulation behavior.

Asiatic acid and madecassic acid are the aglycone forms of the first two, meaning they have lost a sugar group. They are smaller and more lipophilic, which gives them a different role: they penetrate the lipid bilayer of the skin barrier more readily, where they upregulate type-I collagen synthesis. The barrier repair and the longer-term firmness benefits in cica products trace back primarily to these two.

The NF-kB pathway in plain language

The inflammation argument bears a closer look because it’s the part of the cica story most often muddled in marketing. NF-kB is a transcription factor, a protein that, when activated, enters a cell’s nucleus and switches on a long list of inflammatory genes. The activation is appropriate for an injury or an infection. It is inappropriate for the chronic low-grade redness that follows aggressive exfoliation, retinoid use, or even seasonal cold-air exposure.

Asiaticoside binds upstream of the NF-kB activation step, preventing the signal from propagating. The clinical effect is that skin which would have flushed and stayed flushed flushes briefly and recovers. The barrier breakdown that low-grade chronic inflammation drives doesn’t get to start.

This is the mechanistic reason cica is recommended after retinoids. Retinol drives cell turnover by activating retinoic acid receptors. The turnover is the goal. The inflammation that comes with it is the side effect. Asiaticoside and madecassoside dampen the inflammation without blocking the receptor signal. The wanted action proceeds. The unwanted action gets quieted.

Why the percentage on the bottle is misleading

Walk into any K-beauty section and you’ll see “cica” cream marketed at 5 percent, 10 percent, 50 percent. The numbers do not mean what they look like they mean. They refer to the percentage of centella asiatica extract by total formula weight, not to the concentration of the four active triterpenoids in that extract. A 50-percent cica cream made from a low-grade extract may contain less actually-bioactive material than a 5-percent serum made from a triterpenoid-isolated fraction.

The signal that a product is doing serious work is on the ingredient list, not the front of the jar. Look for one or both of madecassoside or asiaticoside named explicitly in the ingredients, ideally in the upper third. If the label only says “centella asiatica extract,” the formula is leaning on the whole-plant extract, which is variable. If the label names a specific triterpenoid by name, the formulator made a deliberate choice about which active to deliver.

According to Pai Skincare’s ingredient page, the well-formulated preparations contain madecassoside at concentrations between 0.2 and 1 percent. Below 0.2 percent and you’re paying for a brand story; above 1 percent and you’re past the point where additional concentration adds clinical effect.

Pairing cica into a routine

For the after-actives placement, cica fits behind retinol or behind a 10-percent glycolic. The classic sandwich is the actives first on dry skin, two minutes of waiting, then the cica layer. The active gets to do its work; the cica reduces the cost.

For barrier-impaired skin, a cica essence used twice daily for two weeks is a reasonable reset. After two weeks the barrier should be visibly less red and less reactive. If it isn’t, the product is probably underformulated and worth replacing.

For makeup wearers, cica’s most useful contribution is what happens underneath the foundation rather than on top. A reduced-redness base means less concealer and a more even foundation finish. The glass skin tutorial and dolphin skin tutorial both depend on a calm, even base layer; cica is one of the cheapest paths to that base. The clean girl tutorial similarly assumes a starting canvas that does not need much covering, and a cica essence two weeks ahead of any new routine is a way to build that canvas.

What cica is not

Cica is not exfoliating. It does not replace retinol. It does not have meaningful direct anti-aging effect on its own; the collagen upregulation from asiatic acid and madecassic acid is real but slow, and a cica cream is not going to deliver wrinkle reduction the way an actual retinoid will.

What it does, well, is reduce the cost of using everything else. That is the entire pitch. A skin doing more, with less reactivity, recovering faster between treatments. A simple, mechanistically clear ingredient that has been quietly doing the work in the background of half the skincare you’ve used for the past five years, regardless of what the front of the jar said.