R's KOSO - Japanese Postbiotic Drink (474ml / 16oz)×2 bottles

Product image 1R's KOSO - Japanese Postbiotic Drink  (474ml / 16oz)×2 bottles
Product image 2R's KOSO - Japanese Postbiotic Drink  (474ml / 16oz)×2 bottles
Product image 3R's KOSO - Japanese Prebiotic Drink  (474ml / 16oz)×2 bottles - R's KOSO
Product image 4R's KOSO - Japanese Postbiotic Drink  (474ml / 16oz)×2 bottles
Product image 5R's KOSO - Japanese Postbiotic Drink  (474ml / 16oz)×2 bottles
Product image 6R's KOSO - Japanese Postbiotic Drink  (474ml / 16oz)×2 bottles

Regular price $198.00


- Fermented Superfood, 100+ Vegetables, Fruits, Probiotics, Prebiotics & Postbiotics, 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, prebiotics and, postbiotics, 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.


Enhance gut health - our century-old traditional Japanese fermentation process provides a natural, plant-based, probiotic to support digestive health, skin radiance and, immune system.

Feeds your microbiome - rich in prebiotics and dietary fiber to feed the beneficial bacteria that reside in your gut and promote a healthy gut.

Better digestion - rich in probiotics and prebiotics to help you absorb more nutrients from the ingredients in the formula as well as the other foods you eat.

Healthy weight - Studies show taking prebiotic fiber caused positive changes in the gut microbiome, including increased levels of beneficial bacteria that are associated with a decrease in fat mass.

Antioxidant-rich - contain abundant functional ingredients, i.e., polyphenols, vitamin A, E, C. It gives your body a powerful shot of helping you neutralize toxins and promote healthy, clear skin, anti-aging.

Boost Immune system - our fermented superfood supplement made from 100+ vegetables and fruits, provides balanced nutrition, combining probiotics and prebiotics. The gut actually has about 70 percent of the body's immune cells. Taking balanced food is one of the big ideas to keep a healthy gut and boost immunity.


Serving size:Daily Enjoyment Use: Mix 15 ml /0.5 oz of R’s KOSO with 1/4 cup of sparkling water (or filtered water). 1-2 times per day before breakfast or/and dinner.
Cleanse Use: Mix 30 ml /1 oz of R’s KOSO with 1/2 cup of sparkling water (or filtered water). 1-5 times per day.

Storage:Refrigerate after opening and use within 4 weeks.

Methods:Try Koso Cleanse. 2 bottles is good for the following.

Methods Good For Suggested Use Recommended Duration

Breakfast Cleanse (every day)

4 weeks

1 time/day

12 weeks

Breakfast Cleanse (4 Days/w)

8 weeks

1 time/day

12 weeks

1-Day Cleanse

6-8 weeks

3-5 times/day

12 weeks

3-Day Cleanse

2 program

3-5 times/day

Every 2 months

5-Day Cleanse

1 program

3-5 times/day

Every 2 months

Daily Enjoyment

4-8 weeks

1-2 times/day

Every day (at least 12 weeks)


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

Leafy vegetable 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 vegetable mix (cucumber, wax gourd, tomato, eggplant, squash, bitter gourd, watermelon, corn, okra, bell pepper), Root vegetable mix (daikon, turnip, ginger, udo, yamato yam, nagaimo, potato, yam, japanese yam, sweet potato, carrot, lotus root, taro, burdock, lily bulb), Fruit 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, galactooligosaccharide, beet sugar, Starch, Japanese plum extract, Beans mix (kidney bean, snow peas, fava beans, soybeans, black soybeans, red beans), Mushroom mix (shiitake, shimeji, eryngii, wood ear, maitake, crimini, enokitake), Cereal mix (black rice, brown rice, red rice, sticky millet, barnyard millet), Seaweed 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, 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 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 726 reviews
Heather W.C.
Outstanding Product

I have been taking R’s KOSO now for about three months consecutively. I feel less cravings, more satisfied, and very excited to drink this stuff all day long. I love it mixed with cranberry club soda!

Iris T.
It has been working great for me!

I’ve been drinking Koso everyday for almost three months, tried the one-day cleanse for about twice but decided to just do the daily breakfast cleanse out of my hangry nature; I’ve tried both the classic and the lower sugar Koso and I like the taste of both. The classic Koso tasts like honey or syrup, and I like to add two tablespoons to a zero-sugar added cranberry juice. The lower sugar Koso still has a natural sweetness from the fruits and vegetables and I either drink it with water or with any juice I like.

I don’t want to gross anyone out but I have to say Koso has made everything really smooth. I’ve noticed that my metabolism had slowed down significantly over several years due to high stress at work and less time for exercise, but since I started my Koso routine, I’ve felt that things are starting to get back to normal. I made a couple of friends try Koso with me and they both felt the results as well.

Definitely recommend both the classic and the lower sugar Koso to everyone!

Very convenient for travel

I like RS Koso and these are very convenient for travel, especially if you don’t have a fridge wherever you are going or are going only a few days. Just too expensive compared to the bottle and they won’t sell you more than 1 box of these mini bottles

Nary B.
Great probiotics drink

It’s very good taste to mix with sparkling water . it helps me improve my digestion . Only thing is that I did not do cleansing as suggested.

Patty L.
Loved this!

So far I love it. We got two bottles and my husband and I both did the one day cleanse. The drink is delicious (I was surprised to find out) and it was relatively easy. By the end of the day I was REALLY hungry but when I woke up in the morning my hunger and normal cravings had subsided. I didn’t expect that after just one day. I’m going to try the breakfast cleanse and if I’m brave the 3-day as well and see how it goes!!

Nicole C.
Great Product

I am thankful that I ran across R's Koso product. I am noticing a big difference . I have lost a couple of pounds so far already without many changes to my lifestyle. And yes it is sweet like honey. But it does smell a little like cabbage. I'm looking forward to using the rest of the elixir for even better health results. Maybe one day I will even visit the facility.


the trial packs were received 2 business days after being shipped all the way from california to georgia which is a feat in itself but the koso was so great i added it to mostly my smoothies with other ingredients love it definitely a repeat customer no doubt

Carolina A.
Miracle ELiXiR!

On May 2023 I visited Japan for the first time. It was an incredible 28 day journey along the Land of the Rising Sun. So much to learn from its people’s spirituality and simply but profound way of life.
And then… I met R’s KOSO!
This “Miracle Elixir” with its PRe - PRO & PoST BioTiCS changed & help my digestive system nearly immediately: No more bloating after eating; my intestinal system working just perfect!
And this Pre-Pro & Post Biotic Liquid tastes GREAT, like a plum syrup. I take it at night, after dinner, mixed with water & ice… So refreshing and healthy! Highly recommended.
And I look forward for my monthly bottle, that comes in an outstanding presentation box, secure & safe. So happy to have found You, R’s KOSO!

Most delicious part of my day

I didn’t know what to expect when I ordered R’s Koso. But wow was I surprised at how yummy it is! It’s sweet like honey, but less sticky. It makes my mouth want to dance! And on top of that, it’s good for me! I’m totally in love!

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