Performance Lab Flex Joint Supplement: Reviews Roundup 2021
The ultimate roundup of reviews for the joint supplement Performance Lab Flex
summarising the pros and cons, overall rating and the best discounts and offers.
Reviews Roundup Summary
We found a lot of positivity surrounding Performance Lab Flex. There is a clear consensus amongst the many articles reviewing it that it’s a very high quality product. The formulation is based on science, with a lot of thought having gone into making it accessible to everyone - using all natural vegan-friendly ingredients, in a form that maximises absorption and is easy to swallow.
4.55 out of 5
Given that Opti-Nutra®, the company behind Performance Lab Flex, stand by their product with a full money back guarantee, we feel it’s definitely one to try.
Review Roundup Details
- What is Performance Lab Flex?
- What causes joint pain?
- What makes Performance Lab Flex different to other joint supplements?
- Who makes Performance Lab Flex?
- What are the ingredients?
- What are the most cited pros and cons of Performance Lab Flex?
- What do users say about Performance Lab Flex?
- What are the review conclusions of Performance Lab Flex?
- Where are the best prices and discounts for Performance Lab Flex?
- Are there Performance Lab Flex discount codes available?
What is Performance Lab Flex?
Performance Lab Flex is a joint supplement that provides an easy-on-the-stomach blend of ‘ultramodern’ joint nutrients designed to soothe and protect achy joints, whilst helping joint lubrication, cartilage renewal and promote long-term joint health and flexibility.
What causes joint pain?
Joint pain can affect just one joint or many joints and is usually due to injury or arthritis. According to NHS UK, whilst osteoarthritis (which typically develops over time in later life) can affect one or many joints, other causes will mostly affect either one or many joints.
Common causes where the pain is in just one joint are cited as:
- Knee pain, which is very common due to the continual demands placed upon knee joints.
- Inflammation of the lining of the knee, often signalled by a sudden recurrence of pain following an injury to the knee.
- Gout (or pseudo-gout), which is a form of arthritis and typically manifests itself in the big toe before moving to another joint.
- Bleeding in the joint space, due to an injury like a ligament tear or bone fracture (medically known as haemarthrosis).
- Cartilage damage behind the knee cap, thought to be due to overuse (medically known as chondromalacia patellae).
Common causes where the pain is in multiple joints are cited as:
- The lesser known psoriasis arthritis, that actually affects 1 in 5 people.
- The more commonly known rheumatoid arthritis.
- Arthritis caused by a viral infection.
The different forms of arthritis are generally associated with swelling, pain and stiffness of the joints and a full medical run down can be found here. There are many other causes of knee pain, such as lupus and scleroderma, and it is essential to seek professional medical advice with any undiagnosed ongoing joint pain.
What makes Performance Lab Flex different to other joint supplements?

With Performance Lab Flex, the reviews we examined praised a joint supplement that covers all the bases of what the science suggests to date, harnessing the development of innovative combinations of ingredients to increase absorption and interaction with biological processes. So to coin a phrase, ‘the whole is greater than the sum of its parts’.
As we’ll discuss further on, whilst the ingredients generally used in bone joint supplements are safe, the effectiveness of the individual ingredients tend to show differing degrees of promise in the treatment and pain management of conditions such as rheumatoid arthritis, osteoarthritis and osteoporosis, and so research is ongoing.
Let’s be very clear, this is no miracle cure for joint pain, no supplement is (although one or two reviews did claim amazing results when taking it), but Performance Lab have designed their supplement to be used “regularly and consistently to support smooth, comfortable movement and protect against long-term bone-grinding damage”, thereby improving physical performance and prolonging an active lifestyle.
Who makes Performance Lab Flex?
Performance Lab supplements are made by UK-based Opti-Nutra Ltd. Opti-Nutra® have a mantra to “uphold the highest nutritional supplement formulation standards in the world” by using:
- nutrients backed by scientific evidence,
- best-in-class nutrient forms that improve potency, efficacy, safety and tolerability
- and novel nutrient combinations to unlock superior performance.
We particularly like their focus on producing products that are 100% vegan, allergen-free with natural, GMO-free ingredients (meaning they are not genetically modified). They also place an emphasis on purity, quality and consistency, so you always know exactly what you are getting with every batch, a must-have for any high-quality supplementation regime.
What are the ingredients?
Performance Lab Flex is built around what Opti-Nutra® call “the most evidence-backed joint stack known to science” - Glucosamine, Chondroitin and MSM. Full details of the published ingredients are as follows:
Let’s take a closer look at the key ingredients...
Glucosamine
Chondroitin
Methylsulfonylmethane
Turmeric
Boswellia
Strontium
What are the most cited pros and cons of Performance Lab Flex?
Performance Lab supplements are rapidly growing in popularity and with that popularity comes an ever growing number of published product reviews looking at the pros and cons of taking them. Amongst the vast majority of reviews we saw a clear consensus on a number of pros and cons of Performance Lab Flex:
Pros | Cons |
Scientifically-proven ingredients / science backed nutrients. High quality of ingredients. Unique blend of ingredients for higher bioavailability and efficacy (especially curcumin from turmeric). Vegan friendly. A very ‘clean’ & pure product. |
Price*. Only available via Performance Lab website. Observed positive effects can take some weeks and months rather than immediate. Those who really suffer with joint pain may need to take more than one serving per day. |
We found these pros are frequently cited as being the reason for reviews going as far as saying they consider Performance Lab Flex to be the single best joint mobility and flexibility supplement on the market.
* Interestingly, whilst price was often cited as a negative for the product, the more comprehensive reviews tend to point out that with the relatively higher price for a joint supplement comes a significantly higher quality and efficacy of ingredients, that actually works out better value for money than many cheaper products.
What do users say about Performance Lab Flex?
Joint supplementation is a personal experience, so it’s helpful to hear what actual users of the product say about it. Here’s a selection of recent reviews:
These reviews, and many more, are published on the Performance Lab website. For transparency purposes, it’s only fair to point out that whilst we trust the good people at Opti-Nutra®, we are unable to confirm if the published reviews provide a fully representative view across the whole user base.
What are the conclusions of Performance Lab Flex?
4.55 out of 5
Given what we’ve found across all the reviews we researched, we think Performance Lab Flex is certainly one to try. There is a clear consensus that it’s a very high quality product, based on science, with a lot of thought having gone into making it accessible to everyone - using all natural vegan-friendly ingredients, in a form that maximises absorption and is easy to swallow.
We are all individual beings though, with differing nutrient needs, and supplements that provide a positive outcome for one may not have the same effect for another. So, as with any supplement, you really have to try it to see if it’s suited for you personally.
And this is where it gets even better, because what we really like about Performance Lab products is that they offer a 30-day, money back, performance promise, so you can make your first purchase risk-free!
Where are the best prices and discounts for Performance Lab Flex?
As you may have seen in the pros and cons section above, Performance Lab Flex can only be purchased directly on the Performance Lab website. However, Performance Lab are growing a reputation for some pretty amazing deals, so if you decide to give Flex a try, make sure you check their website for the lowest prices and best offers.
Are there Performance Lab Flex discount codes available?
Whilst we didn’t find any genuine discount codes for Performance Lab Flex you can get a 10% discount on your first order by signing up to the Performance Lab newsletter. You may not see it straight away when you go on their website but browse a few pages and a popup should soon appear offering the extra 10% discount.