Performance Lab Flex Review 2023

Does ​​Performance Lab Flex Really Work? 

Performance Lab have some good supplements, Flex is not one of them. 

Whilst we’re generally quite positive about labs products, Performance Lab Flex falls foul of the fact that they try to keep their capsules small and their formulas to 2 capsule doses. Unfortunately for our Performance Lab Flex most joint supplements require relatively high volumes to be effective. With a complete dosage of 1000mg it’s not possible to get the ingredients that it does contain in their effective ranges. 

For example, glucosamine in its sulfate form is usually dosed between 1000-3000mg and that’s just one of the ingredients in Performance Lab Flex, and whilst the version used in flex is equivalent to 750mg of glucosamine sulfate it’s still a bit too low to be in the ideal range. Unfortunately, this is a pretty consistent trend through the product. If we compare it to our number one rated joint supplement FlexAgain that uses a blend of ingredients that’s 4000mg. 

There are a couple of positives for our Performance Lab Flex review and that’s the fact it does get a couple of ingredients right and doses Boswellia correctly so it will have some improvements to joint mobility and inflammation. And unlike a lot of it’s competitors it uses Phytodroitin so it is completely vegan [1]. However, if we remove the dietary requirement issue, we can’t see any reason to recommend it over any of the other supplements on our best joint supplements list. 

In short Performance Lab fall foul of their own selling point, and make a supplement that is going to benefit joint health, just less than pretty much all of it’s serious competition.  

Best Supplements For Joint Pain

Performance Lab Flex Review FAQ

The most commonly asked questions from ​Performance Lab Flex Reviews

Is ​Performance Lab Flex Safe?

Performance Lab Flex should be safe, although there can be some side effects as a result of glucosamine including: 

Mild upset stomach, nausea, heartburn, diarrhea and constipation

And boswellia can cause stumulate the immune system so people with rheumatoid arthritis or other conditions should use with caution.

Where To Buy ​Performance Lab Flex

You can only buy Performance Lab Flex from their official website. 

Performance Lab Flex Conclusion

The only real selling point for Performance Lab Flex is that it’s completely vegan, in every other way it’s beaten out by competition. It’s the same price as FlexAgain, which contains the same ingredients in their none vegan version in higher doses and with more effective ingredients on top of that. 

Whilst it’s not a terrible joint health supplement, it’s not a particularly good one either. A disappointing supplement from Performance Lab, we generally expect better from their offering. 


Category Score
Ingredients 5/10
Joint Health 3/10
Pain Relief 5/10
Customer Satisfaction 5/10
Other Benefits 3/10
Value 3/10
Overall 3/10


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