The Cica Deep Dive

One ingredient, all the way down

Centella from toner to serum, nothing else new. Four weeks that show you what this ingredient really does for your skin.

4 weeks, one ingredient

This is for you if…

  • 'Cica' is on half your products and you could not define it
  • Your skin likes centella but you have never run it purely
  • You want to know what an ingredient truly does for you
  • Mixed routines make results impossible to trace
  • You like the idea of skincare as a fair test

What’s going on

Centella asiatica — cica, tiger grass — is the calming plant of modern Korean skincare. Its compounds soothe visible redness and support the skin's own repair. Legend says tigers rolled in it to heal. Science kept the plant and dropped the legend.

The deep dive runs it as a stack. Toner, then serum, morning and evening. Everything else stays the same. Part calming routine, part fair test. By week four you will know if cica is your skin's ingredient. Or just a very popular word.

What causes it

Why one-ingredient months beat scattergun routines:

  • Clear answers. One change means you know what caused what.
  • A real dose. One calmer at two strengths beats five calmers in pinches.
  • Simplicity. Reactive skin likes short guest lists.
  • Knowledge. One clean month informs every future buy.

The plan at a glance

Morning and evening

  1. Gentle cleanse, as usual.
  2. The cica stack. Toner pressed in, serum over it.
  3. Your usual cream. SPF in the morning.

Weekly

  1. A centella sheet mask completes the month.

The steps

The cica stack

Morning & evening

One ingredient, layered from watery to rich

Layers centella in rising strengths. Toner first, then serum. The calming plant arrives in every layer, not just one.

Why it matters: Running one ingredient purely is the cleanest way to learn what it does for YOUR skin. No other variables. Just centella, at two depths. It also happens to be a very good calming routine.

How to do it: Toner pressed into damp skin. Serum over it. Morning and evening. Your usual seal on top.

  • Centella Asiatica
Most suitable productschoose one

Pick the one you want. You can also add another product from this step.

How to choose between these

SKIN1004's Probio-Cica toner, or the Hyalu-Cica for extra water, starts the stack. Purito's centella serum is the strong layer.

Soak

Weekly

Twenty minutes of deep watering your skin cannot get any other way

A sheet mask pins a watery essence against your skin and stops it drying off. Twenty minutes of cover that pushes water in far better than hands can.

Why it matters: Once a week, not daily. Daily soaking can upset skin. That is how a calming ritual becomes a new problem. Weekly, it is the best water top-up in skincare.

How to do it: On clean, toned skin. Fifteen to twenty minutes. Never until the mask dries — a drying mask starts pulling water back OUT. Peel, pat the essence in, seal with the next step.

  • Hyaluronic Acid
  • Centella Asiatica
Most suitable productschoose one

Pick the one you want. You can also add another product from this step.

How to choose between these

Pick by this week's need. Thirsty skin: the Torriden or Isntree hyaluronic masks. Cranky, reactive week: Anua's heartleaf, BOJ's centella, or Pyunkang Yul's calming mask. There is no prize for using the same one every time.

Protect

Morning

The one step that beats every serum

SPF50+ blocks the daily sun that drives early lines, dark marks and skin damage. Including through windows, and on cloudy British days.

Why it matters: For a beginner, sunscreen gives more long-term benefit than any fancy ingredient you could buy. Skipping it quietly undoes the other three steps. It is a habit from day one in every plan we publish.

How to do it: Two finger-lengths for face and neck, as the last morning step. Top up if you are outdoors for long. Yes, even in winter.

Most suitable productschoose one

Pick the one you want. You can also add another product from this step.

How to choose between these

BEAUTY OF JOSEON Relief Sun is the loved everyday classic. Light, dewy, no white cast. HARUHARU Pure Mineral if your skin is very reactive. Mineral SPF sits on top of skin, so it is the gentler choice.

What to expect

  • Week 1 — it feels gentle at once. Nice, but not the verdict yet.
  • Weeks 2–3 — the real signs. Redness settling faster. Fewer reactive days.
  • Week 4 — compare photos and notes with week zero. Love it? Keep the stack. No change? You learned something valuable for free. Mugwort is the next one to try.

Do & don’t

✓ Do

Keep everything else the same for the monthThe test is the point.
Note it weekly'Calm', 'glowy' or 'nothing' is enough.
Photograph at weeks 0, 2 and 4, same light

✕ Don’t

Do not add anything new mid-monthOne guest at a time.
Do not stack five cica productsToner plus serum is the dose.
Do not give up on calming ingredients if cica is not yoursTry the next one cleanly.

Build your set

Your choices from the steps, gathered up. Swap anything here, or untick what you already own.

Changing a product here also updates it in the step above.

Written by the Calm Haven Beauty Product Researcher & Co-founder