Persimmon soap: what it is, how kaki tannin works, and how to choose one

Persimmon soap has gone from a Japanese bathroom staple to something people across the UK search for every month. Most of that interest comes from one question: does it really deal with the stubborn body odour that ordinary soap leaves behind? This guide covers what persimmon soap is, how the tannin in it works, what to look for on the label, and how to get the most out of a bar.

What is persimmon soap?

Persimmon soap is a cleansing bar made with extract from the Japanese persimmon, known in Japan as kaki. The extract comes from unripe fruit, which is where the tannin content is highest. Kaki tannin (kakishibu) has been used in Japan for hundreds of years to treat paper, wood and cloth, and in recent decades it has found its way into soaps designed for adult skin.

How persimmon tannin works

Tannins are large plant molecules that readily bind to proteins and to other organic compounds, including the molecules responsible for body odour. Two things happen when you wash with a tannin-rich soap:

• The tannin binds to odour molecules on the skin, so they rinse away with the lather instead of staying put.
• The soap's cleansing base lifts the oily film in which those molecules sit, particularly the one associated with nonenal, the compound behind the "older skin" smell.

That is the difference between deodorising and masking. A fragrance layers a nicer smell on top. A tannin soap takes the source off the skin.

What to look for when choosing one

Real extract, not just fragrance. Some cheaper bars are "persimmon scented" with very little tannin. Look for persimmon extract or kaki tannin near the top of the ingredients list.

A moisturising base. Tannins are slightly astringent. A good bar balances them with softening oils and humectants so skin does not end up tight. KAKIORA uses coconut oil, hyaluronic acid and hydrolysed collagen for this reason.

A stable, creamy lather. You need a lather that stays put for 20 to 30 seconds on the chest and back. A palm-oil soap base gives that.

Honest claims. A persimmon soap helps wash odour away. It does not "cure" anything and no reputable brand should say it does.

Who is it for?

Anyone who feels that fresh-from-the-shower feeling fades faster than it used to. That is most common from the mid-40s onward, in both men and women, because skin chemistry changes with age. It is also popular with people who work in hot environments, sports players, and anyone who has noticed the smell on pillowcases or collars.

How to use persimmon soap properly

1. Wet the skin and work the bar into a lather in your hands or on a soft cloth.
2. Focus on the chest, back, neck, behind the ears and underarms. Leave the lather on for 20 to 30 seconds.
3. Rinse thoroughly and pat dry.
4. Use daily. The effect builds over the first week and holds as long as you keep the routine.
5. Store the bar on a draining dish so it dries between uses. A dry bar lasts noticeably longer.

How KAKIORA is made

KAKIORA Japanese persimmon soap combines Japanese persimmon extract with five skin-caring ingredients: a palm-oil base for a rich lather, coconut oil for softness, hyaluronic acid to hold moisture, hydrolysed collagen for supple-feeling skin, and a light, clean scent. Each bar weighs 100 g and lasts around four to five weeks with daily use. Our ingredients page lists everything in full.

Common questions

Does it smell of persimmon? Only faintly. The finished bar has a light, clean scent that does not linger.

Can it be used with a deodorant? Yes. Many people find they need less deodorant once the underlying smell is dealt with.

Is it suitable for sensitive skin? The formula is gentle and free of harsh sulphates, but as with any new product, try it on a small area first if your skin reacts easily.

Want to try it? See our 2, 3 and 6 bar packs. Free UK delivery on orders over £29.99 and a 30-day money-back promise on every order.