Based on 410 reviews

I am sleeping better. Just having trouble remembering, missed a day.

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

Great skin thanks to R's Koso

I drink R' Koso everyday and my skin is loving it. I still have not felt the difference in terms of energy boost, regularity, but am not expecting miracle. Have ordered another bottle.


“You are what you eat!” … R’s KOSO has helped me to focus on my gut health and in a short time I’m seeing the results. This will now be a part of my lifestyle!

Koso Postbiotic Drink

I love ❤️ it a lot. I have tried so many different things, but this is the best so far. I can cleansed three days straight without food. I will continue to do it more! Thanks!!!

This stuff works!!!

I've had chronic nausea from four months of antibiotics. I started taking R's KOSO each morning about two weeks ago. The nausea is gone. I had tried everything. I really love this product!!!

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

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

Amazing 🤩

This product is amazing! Loved it! Can’t wait for the next bottle to come in!!!♥️

I continue to love this

Three months now and I still drink it daily. It tastes wonderful.


I love this product so much, I started with the 3 day fast and was so surprised by how easy it was. (i did take a black coffee around 1:00 and a cold pressed juice around 3:00 each day). Lost 5LBS exactly as other reviews mentioned!. I gained 1 lbs back but then I started the morning fast routine and now I am down 12lbs 6 months later. And more importantly I feel great and its a lifestyle I can maintain. I eat regularly between 12-8:00pm. I now incorporate it into evenings and drinks when I want to avoid alcohol at night, so good!

Perfect for travel

I am obsessed with KOSO. I have been taking it for about a month and my stomach is not bloated any longer, no more gas issues. I am traveling for the next week and the trial pack is perfect for my trip!

A very clean feeling!

We love the cleanse and have used it as a meal replacement and as the one-day cleanse/fast. We felt very clean the next days after. The hardest part of the one day is around lunchtime we felt very tired. Not drained or sluggish, but legitimately ready for a hour power nap…which we made sue we did on a Saturday so that we could take that time to reset. Besides the hunger push and pangs which got a little intense at times, we pushed through


This product helped me naturally curb a afternoon appetite with absolutely no side effects. I am thoroughly amazed on how well it worked with my body in the last few pounds of weight loss that I needed

No More GI Issues

I have been drinking this as a meal replacement for breakfast and sometimes lunch, and since doing so, I've noticed that issues I used to have on almost a regular basis with my GI have gone away (nausea, indigestion, bloating, etc). I haven't lost any weight yet, but I also have an extremely difficult time losing weight, so that is not something I would fault this product for.


Wish we could buy more, I provided one bottle per customer as part of their treatment in my spa room after their body sculpting and lymph drainage.

Feels great

Works to me at some point but feel like need to drink more bottles to finally see the difference

Too sweet

Not sure if it helps sleep but I did notice that I sleep so much better when I take my koso. My only issue is that it's so sweet. I wish they could dial down the sweet by a lot. How is it so sweet as a probiotic? I know probiotics eat sweet and this bottle doesn't need refrigeration so whats the deal that it maintains such sweetness? Are these supposed to be living probiotics? Need answers.

Really helped with my bloating!!! Will be purchasing again

i haven't see results yet.How do i know i can lose some weight.

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

Love it

Nice to drink and enjoyed my first cleanse with it. I look forward to making it a regular staple.

Flavor is sweet, syrup like texture

It has a sweet taste, and is pleasantly easier to drink with club soda or/and water. The only thing is that based on the direction, the bottle doesn’t seem to last long, meaning, I’ve consumed it everyday and I am low on supply. At first I didn’t think I could finish it based on their measurement of daily intake however, I like I don’t have enough… I’ve had to stretch out my portions because my next order won’t be filled until next time… I’d rather they sell at a bigger bottle for the month subscription. Otherwise I like that it’s helped my digestion. Don’t know if it has helped me lose weight but I think it’s good.

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