5-Day Joint Support

Flex+ Joint Support Supplement

Dual-Capsule TechnologyClinically Studied ActivesTargeted Joint Support90-Day Money-Back

Supports joint comfort and everyday mobility
First-of-its-kind dual-capsule technology
Helps support healthy, flexible joints through ageing and activity
Supports flexibility and range of motion
Active ingredients backed by 25 clinical studies

Choose your supply

Save 15%

1 Month Supply

60 dual capsules · two a day · 30-day supply
+ 2 Free Gifts worth £35.98

~~£50.00~~

£42.50

£1.42 per day

Your Cartilage Has No Blood Supply. It Needs Better Support.

Cartilage is unusual tissue: it has no blood supply of its own. It feeds through movement - every step squeezes nutrients in and out of the joint like a sponge. From your 30s it slowly thins, the tissues around it stiffen, and around 1 in 3 UK adults now live with joint discomfort that affects their day. The less comfortable movement gets, the less you move - and the less your joints get what they need. It is a loop worth breaking early.

Flex+ was built to support that loop from both ends: two of the most clinically studied joint actives in the world - Univestin®, studied for joint comfort and flexibility within days, and AprèsFlex®, studied for comfort and function that build over months - alongside vitamins D3 and K2, which contribute to the maintenance of normal bones. Two dual capsules a day, built for people who intend to keep moving.

0 Blood vessels in cartilage - it feeds through movement

1 in 3 UK adults live with joint discomfort that affects their day

5 days The window in which the actives in Flex+ were studied to be felt

The Kollo Difference

Built Differently On Purpose

Most joint supplements hide a low dose of cheap, commodity ingredients behind a big promise. Flex+ does the opposite. Two of the most clinically studied joint actives in the world, at levels that matter, in a dual-capsule format built for absorption, so you can feel the difference in how you move.

Two clinically studied activesAprèsFlex® and Univestin® are backed by human trials for joint comfort and mobility, with some studies reporting a difference in days, not months. We chose them because the research does the talking.
Dual-capsule, never dilutedOur first-of-its-kind dual-capsule delivers a targeted daily dose in its optimal form. No cheap fillers, no cutting the dose to hit a price.
Made in the EU, nothing hiddenProduced to high EU manufacturing standards with full label transparency, so what is on the pack is exactly what is in the capsule.

Inside the dual-capsule

Two actives. One daily dose.

Flex+ is built around two of the most clinically studied joint actives in the world, chosen because they do different jobs. One works fast, one builds over time, so you get comfort you can feel early and support that keeps going.

Joint Active 01

AprèsFlex®

Boswellia serrata

The long-game active. In repeated human trials, AprèsFlex® has been studied for joint comfort and physical function that build steadily over weeks and months, with cartilage support measured as far out as six months.^

Studied to be felt in

5 daysJoint comfort^

6 mthsCartilage support^

Daily45.2mg per capsule

Studied across multiple human trials^
Comfort that builds over time^
High-AKBA, absorption-optimised extract

Joint Active 02

Univestin®

Scutellaria & Acacia blend

The fast mover. Univestin® has been studied for noticeable joint comfort and flexibility within the first days of use, working across several of the body's natural pathways at once rather than just one.^

Studied to be felt in

3 daysFlexibility^

5 daysJoint comfort^

7 daysRange of motion^

Fast-acting joint comfort^
Several pathways, not just one^
Two randomised, double-blind trials^

Our Founder

Why I Built Kollo

I've spent my life on the move, balancing broadcasting, marathon training, family life and a busy schedule. Health and wellbeing have always been a huge part of who I am, so I've always taken supplements seriously.

The more I learned about the industry, the more frustrated I became. Too many products were built around marketing rather than science, with underdosed ingredients, unnecessary fillers, or formulations that didn't reflect the research behind them.

That's why we created Kollo.

We work with clinically studied, branded ingredients at doses that reflect the evidence, and every product is developed with our nutrition team based on quality and efficacy, never cost alone. We independently test our products, focus on transparency, and make supplements we're proud to take ourselves every day.

Simply put, we're not interested in doing what everyone else does. We're here to create supplements that do things properly.

Jenni Falconer
Founder, Kollo

Read Jenni's Story

Inside Every Capsule

High-Grade. High-Integrity.

Flex+ combines two clinically studied joint actives, Univestin® and AprèsFlex®, with black seed oil and bone-supporting vitamins D3 and K2. A precision dual-capsule formula, free from unnecessary fillers.

AprèsFlex® Boswellia Serrata [45.2mg]

AprèsFlex® is a premium Boswellia serrata extract, standardised for AKBA (Acetyl-11-Keto-β-Boswellic Acid), one of the plant's key active compounds. In Flex+ it forms the sustained backbone of the formula, in a form selected for absorption.

Benefits

Standardised Boswellia serrata extract
Supports joint comfort and mobility
Enhanced absorption

Univestin® Botanical Blend [135.4mg]

Univestin® is a patented botanical blend of Acacia catechu and Chinese Skullcap, standardised for its naturally occurring flavonoids. In Flex+ it adds the fast-acting layer of joint-comfort support, working alongside AprèsFlex®.

Benefits

Supports joint comfort and flexibility
Clinically studied botanical actives
Helps you keep moving with ease

Black Seed Oil [449mg]

Black seed oil has been valued for centuries and is naturally rich in thymoquinone, a potent antioxidant compound. In Flex+ it complements the joint actives, adding everyday antioxidant support as part of a balanced routine.

Benefits

Naturally rich in thymoquinone
Provides antioxidant support
Traditionally valued for wellbeing

Vitamin D3 [1,000 IU / 25mcg]

Vitamin D3 contributes to the maintenance of normal bones and to normal muscle function, making it a natural partner to the joint actives in Flex+. It also supports the normal function of the immune system, helping you stay active all year round.

Benefits

Contributes to the maintenance of normal bones
Supports normal muscle function
Supports normal immune function

Vitamin K2 MK-7 [100mcg]

Vitamin K2 works hand in hand with Vitamin D3 and contributes to the maintenance of normal bones. Together they round out the Flex+ formula, supporting the strong, healthy foundation your joints depend on.

Benefits

Contributes to the maintenance of normal bones
Works synergistically with Vitamin D3
Supports your skeletal foundation

The science

The science behind the actives

In gold-standard clinical trials of the AprèsFlex® extract, participants saw meaningful changes from Day 1 to Day 180.^

Day 1

+71%IMPROVEDDay 180

Physical Function

Studied for better physical function, including stairs and walking, by 6 months.^

Day 1

-72%STIFFNESSDay 180

Joint Stiffness

Studied for significantly less stiffness by Day 15, improving to 6 months.^

Day 1

-70%DISCOMFORTDay 180

Joint Comfort

Studied for improved comfort from Day 5, building over 6 months.^

^ Based on published clinical studies of the AprèsFlex® (Boswellia serrata) extract at its studied dose. Individual results vary.

Loved By Thousands

Real Results, Real People

Joints

★★★★★

Game changer for my morning stiffness

I'm 52 and have been dealing with stiff fingers and wrists for about two years now. Mornings were honestly miserable – it would take me half an hour just to feel like I could grip a cup of tea properly. Started taking Flex+ about three weeks ago and the difference is genuinely noticeable. My hands don't feel as locked up when I wake up, and I'm back to doing things like opening jars without wincing. Really pleased with these.

Charlotte D ✓ Subscriber

R Joints

★★★★★

Yoga feels easier again

I teach yoga five days a week, and my own joints have been struggling for the past year or so – particularly my knees and ankles. I was starting to worry I'd have to cut back on classes. Tried Flex+ on a whim and within about six days, I felt a real shift. My joints feel less inflamed, and I'm able to move through poses without that grinding sensation. It's made such a difference to my practice and my teaching. So glad I gave these a go.

Rachel K. ✓ Subscriber

Joints

★★★★★

Finally something that actually works

I cycle about 100 miles a week and my knees have been paying the price. I'd tried glucosamine and a couple of other supplements but nothing really made a difference. Flex+ is the first thing that's genuinely helped – took about 10 days but now my knees feel so much more comfortable on longer rides. I can actually get through a Sunday ride without hobbling around for the rest of the day. Wish I'd found these sooner.

Daniel R ✓ Subscriber

Joints

★★★★★

Goodbye sore knees

I’m a keen extreme sports girl, but god, it hurts as you get older. I found these on kolllo when buying collagen and after two weeks I feel 100% less achey.

Sian W ✓ Subscriber

A Joints

★★★★★

Brilliant product.

Better than glucosamine

Amber G ✓ Subscriber

Who it's for

Made for the way you move

Whether you want to move through the day in comfort or are chasing a personal best, Flex+ is built to support active joints.

For

Staying Mobile With Age

Keeping everyday movement easy as the years add up.

For

Active & On The Go

Busy, active people who want to keep moving comfortably through a full day.

For

Golfers

Rounds that depend on a comfortable, mobile swing.

For

Runners & Cyclists

High-impact training that asks a lot of knees, hips and ankles.

For

Tennis & Racket Sports

Stop-start, twist-and-turn demands that load the joints.

The Kollo difference

Not all joint care is equal

See how the clinically studied actives in Flex+ compare with other popular joint ingredients.

	Flex+ Dual-Capsule	Turmeric	Glucosamine	Chondroitin
Two clinically studied actives	✓	✕	✕	✕
Studied for fast comfort (days)	✓	✕	✕	✕
Multi-channel support	✓	✕	✕	✕
Full dose, never diluted	✓	★★★	★★	★
Convenient once-a-day routine	✓	✕	✕	✕

What Flex+ Supports

Two Capsules A Day. Four Reasons.

Everyday joint comfort

Two clinically studied actives, Univestin® and AprèsFlex®, chosen to support joint comfort day to day.

Freedom to keep moving

Formulated to support flexibility and mobility, so you can stay active and move with ease.

A full dose, never diluted

Our dual-capsule format delivers the actives in their optimal form, with no cheap fillers or cut corners.

Strong bones foundation

With vitamins D3 and K2, which contribute to the maintenance of normal bones, plus D3 for normal muscle and immune function.

The Kollo Standard

Clinically Researched | Independently Verified

1st

First-of-its-kind dual-capsule technology for targeted joint support.

Clinical studies behind the active ingredients in Flex+.

97%

Of reviewers would recommend Flex+.

Clinically studied joint actives, Univestin® and AprèsFlex®, in every dose.

Winner: Best Supplement

Winner: Best Liquid Collagen - Silver

Winner: Beauty Category - Silver

universal beauty awards 2024 bronze badge

Winner: Best Wellbeing Supplement

Wellness Awards: Editors Choice

Winner: Best Health Drink

Winner: Best Supplement

Winner: Best Liquid Collagen - Silver

Winner: Beauty Category - Silver

Winner: Best Wellbeing Supplement

Wellness Awards: Editors Choice

Winner: Best Health Drink

Winner: Best Supplement

Winner: Best Liquid Collagen - Silver

Winner: Beauty Category - Silver

Winner: Best Wellbeing Supplement

Wellness Awards: Editors Choice

Winner: Best Health Drink

Winner: Best Supplement

Winner: Best Liquid Collagen - Silver

Winner: Beauty Category - Silver

Winner: Best Wellbeing Supplement

Wellness Awards: Editors Choice

Winner: Best Health Drink

Winner: Best Supplement

Winner: Best Liquid Collagen - Silver

Winner: Beauty Category - Silver

Winner: Best Wellbeing Supplement

Wellness Awards: Editors Choice

Winner: Best Health Drink

Winner: Best Supplement

Winner: Best Liquid Collagen - Silver

Winner: Beauty Category - Silver

Winner: Best Wellbeing Supplement

Wellness Awards: Editors Choice

Winner: Best Health Drink

Everything You Need To Know

Frequently Asked Questions

What will I notice, and how long does it take to work?

Most people start to notice easier, more comfortable movement within 5-7 days of use. Joint actives work best taken consistently, so we recommend giving Flex+ a full 8 to 12 weeks as part of your daily routine. Your first order is covered by our 90-day money-back guarantee.

What is in Flex+, and what makes it different?

Flex+ pairs two clinically studied joint actives, Univestin® and AprèsFlex®, with black seed oil and bone-supporting vitamins D3 and K2. It is delivered in a precision dual-capsule format and made in the EU to high manufacturing standards.

Why a dual-capsule format?

The dual-capsule technology lets us pair the right actives together in their optimal form, delivering a targeted daily dose for joint comfort and mobility in a way a single capsule cannot.

When and how should I take it?

Take two dual capsules daily with food, at whatever time suits your routine, morning or evening. Do not exceed the stated dose.

Is it suitable for everyone, and are there any allergens?

Flex+ is suitable for both men and women. Please check the full ingredient list on the pack if you have any known allergies, and see the label for suitability for your dietary needs.

Can I take it if I am pregnant, breastfeeding or taking medication?

If you are pregnant, breastfeeding, taking medication or managing a health condition, we always recommend checking with your GP or healthcare professional before starting any new supplement.

Where is it made?

Flex+ is made in the EU to high manufacturing standards, so you can trust exactly what is in each capsule.

Can I subscribe, and can I cancel anytime?

Yes. Subscribe and save on every delivery, choose how often it arrives, and pause, skip or cancel anytime from your account. There is no long-term commitment.

5.0

Rated 5.0 out of 5 stars

Based on 20 reviews

100%would recommend this product

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PG
Paul G.
Verified Buyer
Reviewing
Flex+ Joint Support Supplement
I recommend this product
Rated 5 out of 5 stars
3 weeks ago
Helped me!
Always had clicky knees that are sore, my partner bought me these and I think they’ve helped! Thanks!
Was this helpful?
AO
Ann O.
Verified Buyer
Reviewing
Flex+ Joint Support Supplement
I recommend this product
Rated 5 out of 5 stars
1 month ago
Amazing supplement!
Flex has made an enormous different to my arthritic knees. Morning stiffness is more or less gone and pain levels are dramatically reduced. I thought Kollo Collagen was good, but for me this is next level. I’d take both if I could afford it!
Love this company too. They are quietly confident in their products, no flashy ‘celebrity’ campaigns. And their customer service is excellent.
It all works for me!!
Was this helpful?
RN
Rachel N.
Verified Buyer
Reviewing
Flex+ Joint Support Supplement
I recommend this product
Rated 5 out of 5 stars
2 months ago
Great supplement!
It only took a week until I could notice a difference. I did not feel the pain I used to in my joints. Great job Kollo on another amazing product.
Was this helpful?
SR
Shane R.
Verified Buyer
Reviewing
Flex+ Joint Support Supplement
I recommend this product
Rated 5 out of 5 stars
3 months ago
Excellent
I recently tried this product due to having some aches in my joints after exercising.I had a trip up a couple of weeks ago.A bit of a shin splint.This product has been remarkable, I have healed up quicker than anticipated.Thank you
Was this helpful?
KO
Kirsty O.
Verified Buyer
Reviewing
Flex+ Joint Support Supplement
I recommend this product
Rated 5 out of 5 stars
3 months ago
Feeling great!
I’ve been taking Flex since it launched a few months ago and I just love it. I honestly believe it’s helping my joints as I’m not experiencing the same discomfort or aches post gym workouts. Love it, thank you!
Was this helpful?

Flex+ Joint Support Supplement

Choose your supply

Your Cartilage Has No Blood Supply. It Needs Better Support.

Built Differently On Purpose

Two actives. One daily dose.

AprèsFlex®

Univestin®

Why I Built Kollo

High-Grade. High-Integrity.

AprèsFlex® Boswellia Serrata [45.2mg]

Univestin® Botanical Blend [135.4mg]

Black Seed Oil [449mg]

Vitamin D3 [1,000 IU / 25mcg]

Vitamin K2 MK-7 [100mcg]

The science behind the actives

Physical Function

Joint Stiffness

Joint Comfort

Real Results, Real People

Made for the way you move

Staying Mobile With Age

Active & On The Go

Golfers

Runners & Cyclists

Tennis & Racket Sports

Not all joint care is equal

Two Capsules A Day. Four Reasons.

Everyday joint comfort

Freedom to keep moving

A full dose, never diluted

Strong bones foundation

Clinically Researched | Independently Verified

Frequently Asked Questions

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