Based on 386 reviews
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.

I would like my order to come every other month please thanks,Magdalene Dantes

Great product

When I saw RS Koso being advertised online, curiosity comes in. I am not a fan of eating vegetables. I like fruits but not all. I read all about it and thought that this might be the one I'm looking for. I always feel bloated and it's hard for me "to go" everyday. So, after a long thought, I decided to order. It came fast and I thought the taste was bad. To my surprise, it's sweet and have a good taste knowing that it was fermented vegetables and fruits. Oh, boy! I was very happy of the result! After taking it everyday, my gut was feeling great. I don't feel bloated and the most important thing is, I am able "to go" everyday which is a big thing for me. Oh, another great benefit is loosing weight. Koso helped me to loose weight. I don't need to loose so much but getting rid of my belly fat even for 2 to 3 inches was an added bonus for me. Because I love the product, I recommended it to my friend who told me that it was doing great for her body, too. Thank you Koso!!!

Single Daily Meal Replacement for 2 weeks, Japanese Postbiotic Drink - R's KOSO -

This is awesome!!

I have loved every drop. My kids and my 80-year-old mom are on board with me. Wr’ve all had great success, like no more headaches, and going potty more often. I'm glad I’ll get my shipment every month and I don't have to do anything about it. Keep it coming!!


It is very tasty not sour at all.

great to start

very good and it requires tiems to work in the system

4 Days A Week Meal Replacement Each Month, Subscribe & Save (25%OFF) - R's KOSO -

Rs Koso

I feel light after drinking koso every morning when i wake up

Easy to use

I use this as a probiotic and fine it very effective

Tastes great

I can’t wait to order more.

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

It was very easy to fast for 3days with Koso cleanse Drink. I lost 3lb and I’m still maintaining my diet. It’s little pricey but highly recommend.

R’s koso works good in my digestive system

Started the process yesterday, I’m doing a 3 day cleanse which has proven to be effective for me on my 2nd day.

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

My organs love this

I have this every morning and I can feel my organs soaking up the goodness. Really heals and cleans my gut. I can’t stop recommending it to friends!

I like mixing it with warm water and drinking it as a morning tea each day!

It was okay

I didn’t see or feel much difference. I am already vegan and have good gut.

Enjoying R’s Koso

Brought sample pack on a trip and it was easy to use, tastes good, and worked well. I will continue to use once I get home.

Effective health option

I recommend this to everyone, it is a good cleansing option

Best healthy probiotic

My sister and I greatly love this drink, it’s done wonders for us. I had bloating for a month but after a week of taking this every morning my bloating disappeared and the acid reflux which I had for two months as well. Thanks, this is going to be a staple in my house 🥰


Very enjoyable to drink every morning. One bottle last me 2 weeks. I miss having it as a morning breakfast replacement. Excellent product.

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

KOSO is Great

Started taking Koso about 2 months ago and noticed more energy and able to fast with no problems. Higher mental clarity and better digestion. Definitely recommend daily use.

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