Based on 752 reviews
Amazing Product

I really thought this was going to be a waste of 💰. I have 11 autoimmune diseases and knowing how the gut bacteria can effect these, I thought I would give it a try. Well, I took a small capful to test it. I felt totally better and I didn’t know I felt bad. My gut must have been missing whatever is in this.

Koso needs to be less expensive but it has made a huge change in how I feel and my weight. I take it 3x per day…sometimes a little before bedtime. My stomach feels so much calmer, the IBS-C I have is improving and I no longer have food cravings.

I could tell in the first 1/2 teaspoon.

Dr. Maribeth Jergens

R’s delicious Koso

We know fermented foods are very beneficial to our health, the more we eat of them the better actually. R’s Koso has an incredible variety of great veggies included in this absolutely delicious food. It is sticky, quite sweet, wonderfully delightful too. Am seriously considering R’s less sweet version. The only downside is that it’s expensive but the subscription really really cuts the cost. A genuine investment in your improved health.

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

Hi, it is veery good, only I didn't understood your direction to follow for detail
will you please call me or email the I will follow , ok I knew it is very good change to loose weight tel [****] Thks

So far so good

I did not start it right away but now on it once a day before my breakfast at 11am, today is day 3 and I have noticed tons of energy and for some reason I don't feel hungry. I am not half way yet, I will know after a week.

I love Koso

I really love a shot of KOSO in the morning.

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

Trial Pack - Japanese Postbiotic Drink (30ml/1oz × 5 bottles) - R's KOSO -

After more than a month...

I had tried Koso at the beginning of the summer and even took it on a road trip to help counteract the effects of eating in too many restaurants. It worked wonderfully and I have now moved forward with a subscription.
For the last month I have used Koso as a replacement for breakfast and have noticed less bloating and digestive issues in general. I also feel better and seem to have more energy.
I love the taste and it is very easy to make a glass of Koso in the morning. Overall I am very happy with Koso. It has been very easy to add to my routine and to actually sustain. I am hopeful that my success with Koso will lead to other healthy lifestyle changes in the future.

Taste too good for something healthy

Expected vinegar like taste but was sweet like honey and drinking sparkling water with it is simple and easy.


I like the flavor of Koso. I feel like it may be beneficial to my gut. The cost is an issue but I will order one more time to see if there are sustainable benefits.

Seems to be helpful, but too early to make a firm judgment as I am on it for over a month now.

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

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

Not sure yet

I am continuing to take 2tsp every morning hoping for better digestion

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

Great Flavor

The LS Koso is great. I wish you have it in a lager contain like the original bottle.

Best probiotics

I tried many probiotics since I have gut issues.
I found R’s Koso in an instagram post and I decided to give it a try.
The taste is weird at the beginning but a few days after I started to like the taste, now is part of my every morning routine and my gut never been better.
My constipation problems and colitis improved significantly, super recommended!


Cleans you from the inside out!

we love it


Kept bloat at bay

So far it’s been keeping away the bloated feeling. I’m also able to digest beans better now. Hopefully it’ll stay this way so I can keep eating more veggies. Have yet to try the detox though.


I felt the difference from the first time trying it.. Thank you

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