R's KOSO - Japanese Prebiotic Drink (474ml / 16oz) * 12 bottles

Product image 1R's KOSO - Japanese Prebiotic Drink (474ml / 16oz) * 12 bottles
Product image 2R's KOSO - Japanese Prebiotic Drink (474ml / 16oz) * 12 bottles
Product image 3R's KOSO - Japanese Prebiotic Drink (474ml / 16oz) * 12 bottles
Product image 4R's KOSO - Japanese Prebiotic Drink (474ml / 16oz) * 12 bottles
Product image 5R's KOSO - Japanese Prebiotic Drink (474ml / 16oz) * 12 bottles
Product image 6R's KOSO - Japanese Prebiotic Drink (474ml / 16oz) * 12 bottles

Regular price $999.00 Sale price $1,188.00


- 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, 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: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 vegetable mix (cabbage, lettuce, asparagus, broccoli, rape blossoms, celery, cauliflower, spinach, chingensai, suiki, spring chrysanthemum, chisha, parsley, sprouts, perilla), Fruit vegetable mix (cucumber, winter melon, tomato, eggplant, pumpkin, bitter melon, watermelon, corn, okra, bell pepper), Root vegetable mix (daikon, turnip, ginger, uddo, yamato, yam, potato, sweet potato, carrot, lotus root, taro, burdock, lily root), Fruit mix (apple, quince, loquat, ume, strawberry, akebi, kumquat, apricot, sudachi, fig, mandarin orange, iyokan, kiwi, persimmon, peach, cherry, melon, grape, plum, pear), Brown sugar, crude sugar, malt sugar, galactooligosaccharide, sugar beet, glucose, ume extract, Bean mix (green beans, green peas, broad beans, soybeans, black soybeans, red beans), Mushroom mix (shiitake mushrooms, shimeji mushrooms, eringgi, jellyfish, maiko, enokitake) Cereal mix (black rice, brown rice, barley, bare wheat, red rice), Seaweed mix (kelp, wakame, aosa, hijiki, nori, mozuku, tengusa), Herb mix (dandelions, crimson, clover, aoki, jacobe, yukinoshita, kimihihiki, hinata taikochichi, sugiina, itadori, seri, artemisia, persimmon leaves, pine leaves, cedar leaves, persimmon leaves, octopus leaves, mulberry leaves), koji, yeast, lactic acid bacteria

- 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 taste vegan?
Yes. R's KOSO taste 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?
You can mix 2 tablespoons of R's KOSO with ½ cup of filtered or sparkling water. It's also good to take with yogurt, alcohol.

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, 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.

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 209 reviews
Love this

I am addicted your products and drinking every morning with sparkling water. Now I am in fasting session for 2 days. I am thinking to adjust my subscription.

5 stars

R’s KOSO IS JUST WONDERFUL. I have been using it for my Crohn’s disease and I must say, it has been helping me a lot with the pain. Thanks

Good stuff but definitely pricey

So i already take pre & probiotics and while i did enjoy the product for its taste and originality i can’t see myself buying the bottle at $100 when it wasn’t anything special just kinda unique! It was quite good though

Beautiful Product

This is my first time trying Koso. I really enjoy the taste! I can also feel the "detoxing" but physically nuturing effects from drinking it (with water) as a meal replacement, or 15 mins before a meal. My only challenge with it is that is contains 9g sugar per serving, which is higher than I thought. I have to be a bit careful with it bc of reoccurring v. Infections, but I haven't had problems with it, just have to be more mindful for the rest of the day. It is also packaged beautifully, and feels ceremonial as such.

Healthy gut

I have been using Koso drink for a couple of months now as a supplement and for one day cleanse. I initially was hesitant to buy it because of the price but so glad I tried it. I saw a significant improvement in my gut health since using Koso. Bloating is reduced dramatically. I am able to eat foods that would cause bloating or irritate my stomach if I did not use Koso. Also, late lunch or dinner (if caught up at work) do not bloat me anymore. I also noticed that Koso aids in keeping stools soft. I highly recommend trying it for gut issues.

Love it!

I went with the trial pack initially and then ended up buying the bottle. It tastes like sweet plum juice and has aided me in my weight management. It does control appetite to an extent. Also, just to know the contents that goes in this drink makes me feel good which my gut will thank for. As scientists and doctors say, a majority of diseases begin if the gut or our microbiome is in imbalance. The only downside is the price but I can imagine that because of the high quality of the product. Cannot wait to order another one!

Customer Review

I just started for a week. It seems that my gut is doing well. It has lessen my bloating so far.

Healthy Movements

The last 2 weeks I've been taking KOSO prebreakfast and waiting an hour or so to eat. I haven't experienced any significant GI distress like I normally do which is huge for me. I'm on a consistent schedule of at least one movement a day which is very pleasant for me. Wanting to wait a bit longer to give 5 stars to confirm this is actually the stuff causing it.


I am doing the 3 day cleanse, and so far it has been great. Usually cleanses leave me feeling hungry and icky afterwards but this wasn’t like that.

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