12 Day Challenge

Get your VaVaVoom back in just 12 days!

All it takes is drinking a bottle of ió Gut Health Drink daily for 12 days. Easy peasy!

Feeling bloated? Struggling to lose weight? Or perhaps you're feeling a bit low, blah, and sluggish, ió can help!

Formulated to support gut & overall health

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Easy to add to your daily routine

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Proven to support proper gut function

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No added sugar

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Vegan & gluten-free

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Scientifically proven to feed friendly gut bacteria

Take the 12 Day Challenge

Experience the difference just drinking one bottle of ió Gut Health Drink daily for 12 days can make.


Scientifically proven to feed friendly gut bacteria.

Our revolutionary water is backed by two authorised health claims and two university studies (Glasgow Caledonian University and the University of Roehampton).

Plus, it tastes great, too!

Aly said goodbye to IBS, bloating, and not being able to eat certain foods...

'I've had stomach pains and IBS all my life. In the past week of drinking ió Gut Health Drink (previously known as ió fibrewater) as part of the 12 Day Challenge, I'm not as bloated and in pain anymore. I'm also able to eat certain foods.


I can't imagine not having ió in my diet and everyday life.'

Aly P.

Say hello to ió & get 20% off! Buy for £23.19 vs. £28.99 by using the code '12DAY20' at checkout.

Check out our reviews!

What a few of our 12 Day Challenge fans are saying...

Nicky W. Verified purchase
10/13/2025

I’ve been a fan of ió drinks for a while now, and they’ve become a regular part of my routine. I love that they make it so easy to boost my daily fibre intake with no effort, no fuss, just a genuinely enjoyable drink that’s good for you too.

The flavours are light and refreshing (not at all artificial-tasting, which is a big plus), and I really appreciate how clean and natural they taste. It’s such a simple swap that supports gut health and overall wellbeing - wouldn’t be without them now.

Sigi Verified purchase
15/10/2023

Wow, wow, wow! IO ROCKS!

I can't tell you how amazing IO is for our kids! Not only is it the only drink I am happy to give them other than milk or water, and they love it! And I love it as a parent!

With every bottle, they're boosting their fibre intake by 40%, and constipation (and the pain, upset, and suffering that goes along with it) is a distant memory! Our kids love both flavours, too.

I tell all my friends and family about it. Who knew a drink could be such a life-changer? IO IS! THANK YOU!

Jessica C. Verified purchase
19/01/2024

After only 10 days of using io fibre water I am happy to already be seeing the benefits. The main positive change for me is the bloating, I am feeling much less bloated. The product itself is lovely, and it’s something that fits in well in day to day life. I would highly recommend this product.

Isobel G Verified purchase
13/10/2023

ió is a revelation to me! I have a variety of digestive health issues, and bloating was a real problem. My digestion has been so much easier for the first day of drinking this incredible product, and it has helped my husband and son too.

"I'm really impressed!"

Rachel took part in our 12 Day Challenge to see if ió would help with her weight loss journey...it sure did!

'ió works 100% ! I'm feeling fuller for longer, and I'm really impressed!'

In fact, 68% of people drinking a bottle of ió daily for 12 days noticed they ate less at mealtime and 61% snacked less and felt fuller for longer.

Rachel M

Frequently Asked Questions