Based on 212 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.

Highly recommend

My gut health and energy has improved dramatically since I started drinking this. My energy levels have improvised and I am eating foods that I could not eat for years because I would have a terrible reaction. This drink is worth every Penny

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

Rs Koso

My stomach bloat has diminished since I started using Koso. I love it so much I told my family about it. It tastes really good too! I strongly recommend it

Gut health

I’m so glad I gave this product a try because it was definitely worth it. I’ve always had a sensitive stomach so rsKoso really helps me digest better and it’s overall good for my gut health

For the $$$, I hesitate to repurchase for un-noticeable benefit (if there is any benefit)

My mom, my husband and I have been drinking it daily for 2-3 weeks, we haven’t noticed any difference. I still feel bloated in the afternoon. I haven’t seen any changes in bowel movement either.
For the price, I hesitate to purchase again. If the price is more reasonable, I don’t mind to keep it as my daily routine.


One of my favorite supplement

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

My new favorite drink. Even my kids loved it! 5 and 6 years old. Couldn't compete my cleanse sadly because they kept requesting a glass.

It's amazing,I can't wait for my other one.

I lost 5 lbs on three days , and I see a lot of changes on my body.

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

So far so good

I saw the product advertised by a personal trainer I follow on YouTube and decided to give it a go. I’m taking it in the morning and so far I feel my digestion has definitely improved!

Feeling Healthier

After serious hospitalization, I started taking this product as a meal replacement for breakfast. My nutrition, energy level and labs improved.

This is great!

I think it got rid of my acid reflux....thx!

Creative Ways I've Used R KOSO

Lately I've been using R Koso to FLAVOR my teas, drinks, and mocktails. It's been lovely.

Close (esc)


Use this popup to embed a mailing list sign up form. Alternatively use it as a simple call to action with a link to a product or a page.

Age verification

By clicking enter you are verifying that you are old enough to consume alcohol.


Main menu

Shopping Cart

Your cart is currently empty.
Shop now