Kojic acid soap has gone from a niche find to a bathroom staple. If you just bought your first bar, a little technique goes a long way.
What kojic acid is
Kojic acid is a compound produced during the fermentation of rice, the same process used to make sake and soy sauce. In cosmetics it is valued for helping skin look brighter and more even in tone.
Step by step
- Patch-test first. Lather a little on the inside of your forearm, rinse and wait 24 hours.
- Wet your skin with lukewarm water and work the bar into a lather in your hands or in a mesh foaming bag.
- Apply the lather — not the bar itself — to your face or body, avoiding the eye area.
- Start with 20 to 30 seconds of contact. As your skin gets used to it you can work up to a minute or two.
- Rinse thoroughly and pat dry.
- Moisturize. Brightening soaps exfoliate, and moisturizer keeps skin comfortable.
How often
Once a day is plenty at the beginning. If your skin feels tight or looks red, drop to every other day. More is not faster.
The non-negotiable: sunscreen
Kojic acid — and retinol, which our Kojic Acid Soap Bars also contain — can make skin more sensitive to sunlight. A broad-spectrum SPF 30 or higher every morning protects your skin and your results.
What to pair it with
- Kojic Acid & Turmeric Cleansing Pads two or three times a week for extra exfoliation.
- A simple, fragrance-free moisturizer.
- Patience: skin renews itself over several weeks, so judge your routine after a month or two, not a few days.
Make the bar last
Keep it on a draining soap dish away from the shower stream. A bar that sits in water turns soft and disappears quickly.
Stop using the soap and talk to a dermatologist if you develop a rash, burning or persistent irritation.
This article is for general information only and is not medical advice. Statements about dietary supplements have not been evaluated by the Food and Drug Administration. Products are not intended to diagnose, treat, cure or prevent any disease.