Testimonial Sample - R's KOSO, Japanese Postbiotic Drink -

Product image 1Testimonial Sample - R's KOSO, Japanese Postbiotic Drink  -
Product image 2Testimonial Sample - R's KOSO, Japanese Postbiotic Drink  -
Product image 3Testimonial Sample - R's KOSO, Japanese Prebiotic Drink  - - R's KOSO
Product image 4Testimonial Sample - R's KOSO, Japanese Postbiotic Drink  -
Product image 5Testimonial Sample - R's KOSO, Japanese Postbiotic Drink  -
Product image 6Testimonial Sample - R's KOSO, Japanese Postbiotic Drink  -

Regular price $99.00



✨Free 474ml of R's KOSO bottle

* We will refund when you meet the requirement.

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✨Subscribe R's KOSO youtube

✨Buy testimonial sample bottle
    Try 3 Day Koso Cleanse
     Make youtube video of 3 Day Koso Cleanse & Upload to public
    * Make over 3 min video contents, Show before/after, Say your experience.

TAG on youtube #kosocleanse #koso # rskoso #kosojapan

✨Link on youtube https://rskoso.com/



If you have any questions please contact us. info@rskoso.com


- Fermented Superfood, 100+ Vegetables, Fruits, Prebiotics & Prebiotics, Cleanse -

“Koso” means enzyme or ferment in Japanese. Koso drink is a century-old traditional fermented drink made from vegetables, fruits, and plants. It's an essential part of the Japanese style of juice cleanses or intermittent fasting. Koso Cleanse is a century-old traditional Japanese juice cleansing method that has proven to keep your gut healthy.

R’s KOSO is the only superfood supplement on the market that provides balanced nutrition, combining probiotics and prebiotics, which have proven to improve gut health and boost immunity. It's made from over 100 vegetables, fruits, and plants, including seaweeds and mushrooms, and undergoes about 1-year fermentation process. You can enjoy it as a daily supplement but also cleansing and fasting with R's KOSO is a great way to reset your digestive system, and restoring microbiome health.

Good to know : NON-GMO, Dairy-free, VEGAN-friendly, Japan Made, 1-year fermentation, Contains Probiotics & Prebiotics. 70 years' experience to make Koso.

* The taste like Sweet Japanese plum juice. We recommend mix with sparkling water. It's going to be Plum flavor Prebiotic Soda.


Serving size:2 tablespoons (30ml / 1oz) of R's KOSO mix with 1/2 cup water or sparkling water. 1 serving is calculated for Cleansing. It can be used 1/2 serving for daily enjoyment.

Storage:Refrigerate after opening and use within 4 weeks.

Methods:Try Koso Cleanse. 1 bottles is good for the following.

Methods Good For Suggested Use Recommended Duration

Breakfast Cleanse (every day)

2 weeks

1 serving

12 weeks

Breakfast Cleanse (4 Days/w)

4 weeks

1 serving

12 weeks

1-Day Cleanse

3-4 weeks

3-5 servings

12 weeks

3-Day Cleanse

1 program

3-5 servings

Every 2 months

Daily Enjoyment

2-4 weeks

1/2-1 servings

Every day (at least 12 weeks)


- 100+ INGREDIENTS - Vegetables, Fruits, Seaweeds, Mushrooms -

Leafy vegetables mix (cabbage, napa cabbage, lettuce, asparagus, broccoli, canola flower, celery, cauliflower, japanese mustard spinach, spinach, bok choy, taro stem, crown daisy, chisha lettuce, parsley, sprouts, perilla), Fruit vegetables mix (cucumber, wax gourd, tomato, eggplant, squash, bitter gourd, watermelon, corn, okra, bell pepper), Root vegetables mix (daikon, turnip, ginger, udo, yamato yam, nagaimo, potato, yam, japanese yam, sweet potato, carrot, lotus root, taro, burdock, lily bulb), Fruits mix (apple, quince, loquat, japanese plum, strawberry, chocolate vine, kumquat, apricot, sudachi, fig, mandarin orange, iyokan, kiwifruit, persimmon, peach, cherry, melon, grape, plum, pear), Brown sugar, Crude sugar, Malt sugar, Galacto-Oligosaccharide, Beet sugar, Starch, Japanese plum extract, Beans mix (kidney bean, snow peas, fava beans, soybeans, black soybeans, red beans), Mushrooms mix (shiitake, shimeji, eryngii, wood ear, maitake, crimini, enokitake), Cereals mix (black rice, brown rice, barley, naked wheat, red rice), Seaweeds mix (kelp, wakame, sea lettuce, hijiki, nori, mozuku, tengusa), Herbs mix (plantago, dandelion, kumazasa, clover, aucuba, chickweed, saxifraga stolonifera, agrimonia pilosa, achyranthes bidentate, horsetail, japanese knotweed, water dropwort, mugwort, persimmon leaf, pine needles, cedar leaf, hiba, goji leaf, mulberry leaf), Koji, Yeast, Lactic acid bacteria. contain: Soy
*All ingredients are fermented together. It may vary in color, texture, and flavor due to seasonal and crop variances

- 1-YEAR FERMENTATION - Prebiotics and Probiotics -

A century-old traditional drink, Koso has good bacteria which are Lactobacillus brevis, Lactobacillus plantarum, Lactobacillus casei, Lactococcus lactis. And galactooligosaccharide and dietary fiber are included as prebiotics. Dandelion Greens, Asparagus, apples, Burdock, Barley, Seaweeds act as prebiotics ingredients.


What does R's KOSO taste like?
R's KOSO is a Japanese plum flavored drink.

Is R's KOSO vegan?
Yes. R's KOSO does not contain animal-derived ingredients and the drink is plant-based.

How long has it been fermented?
R’s KOSO is fermented for about 1 year.

What’s the best way to take R's KOSO?
We recommend mixing 2 tablespoons of R's KOSO with ½ cup of sparkling water (or filtered water) for cleansing. It's also good to take with yogurt, alcohol for daily enjoyment.

Is there an optimal time of day to take R's KOSO?
No, it can be taken at any time of the day that suits you. Especially we recommend you drink after you eat/drink too much. It is helpful to digest. Actually many Japanese women take it after dinner or replace the meal.

How does it compare to the Kombucha and other drinks?
R's KOSO is the only 100% plant-based supplement which has probiotics, prebiotics, postbiotics, acetic acid, Phenolics, vegetable, and fruits nutrients, Vitamins (A, B1, B2, B6, C, D, E, and K), Mineral (calcium, phosphorus, potassium, sodium, chloride, magnesium, iodine, iron, zinc, copper, manganese, iodine), 17+ Amino Acids, Short-chain fatty acid.

How different between Juice cleanse and Koso Cleanse?
R’s Koso’s Main feature is the benefit of Gut health. Compared to Juice cleanse, Koso Cleanse has probiotics and prebiotics that have positive impacts on your gut. Some research reveals that the gut is connected to the brain and skin.

How can we control our blood sugar?
If you concern about blood sugar, we recommend consuming Koso a little less or drinking it for 1-2 hours.

Is R's KOSO safe to use when pregnant and when breastfeeding?
Yes, it's all natural plant-based food so you can take it.

Can I take it with other supplements?
Yes, R's KOSO can be taken with every other supplement because it's food.

Does it contain preservatives?
No, it is not contained it. The fermentation process made its shelf life longer.

Customer Reviews

Based on 322 reviews
Gabrielle H.


My Koso arrived broken so I haven’t been able to try the cleans :(

Stephan T.
R’s Koso so good

I just received my R’s Koso and I am amazed at just how good it is. Love the taste and after just a few weeks I can truly feel the change for the better

Nga P.

It is a bit sweet for me.

Hsiaohan C.
Hsiao h.

too sweet especially at morning before breakfast, stomachache if I drink at early morning,

Malini S.
The Best Product I absolutely love it.

Helps the Gut Health and immunity and also aids in weight loss with a healthy approach to it.

Mark L.
Perfect Biome Optimizer

R's Koso is a game changer when it comes to my daily ACV consumption. R's makes it so easy to get my ACV intake without any stomach upset. 10g of carbs is worth the huge decrease in after meal bloating. Can't wait to experiment with the recommended cleanses!

T’s R.
It works if you can get beyond upsetting taste

I was gifted this product and have put off reviewing because I had very high hopes but ultimately this was not for me solely based on flavor which I found to be intolerable. If they could change the flavor I would push this as an influencer all day long.

Packaging A ++
Product actually working A
Taste of Product F

I tried to do the three day cleanse and could not get through the end of second day. The taste of this product is like sick fermented broccoli and it literally was too much for me. I cringed all the way through. I decided to let go of trying to swallow it with just water and have been using it in my smoothies where the flavor can be disguised. I am a health nut who loves vinegar and other fermented foods like kombucha. This is not that. It’s a sweet yet stinky food that you then have to dilute with water and try to suffer through. People who say that they love the taste…very very questionable.

Daniele H.

This has helped my digestive system with a few issues I was having. I have tried multiple products prior to this. Definitely worth taking.

celestino m.


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