Important notice: This post contains affiliate links. If you buy Performance Lab Flex through links in this post, I may earn a small commission at no extra cost to you. I received a bottle of Flex for free from Performance Lab. This review is my opinion of Flex and does not consistute medical advice. Consult your doctor before trying any supplement!
Today I have this Performance Lab Flex review, including my experience using the supplement. In this review, I’ll share my findings about Performance Lab Flex and its expected benefits, ingredients, safety notes, pricing, and more.
Performance Lab Flex Summary
Pros
- Supports joint comfort and mobility, though results vary.
- Contains ingredients such as CurcuWIN® curcumin, AprèsFlex® Boswellia, and OptiMSM®.
- Gentle ingredient doses make Flex more suitable for sensitive individuals and daily use.
- Plant-based, 3rd-party tested, and Clean Label Project certified.
- 30-day money-back guarantee for first-time buyers, minus any shipping costs.
Cons
- High price (especially for customers outside of the U.S.)
- Only sells on the official website
- Low ingredient amounts — may not be as potent as higher-dosed joint supplements
Summary:
In my experience, Performance Lab Flex proved to be a gentle and high-quality supplement for joint health. The addition of anti-inflammatory ingredients like curcumin is supported by clinical evidence not just for joint mobility but also overall wellness. I didn’t experience any noticeable side effects during my use of Performance Lab Flex. That said, I also can’t say I noticed major differences in how my joints felt. If you struggle with joint discomfort, you’ll need to try it for yourself to know how it works for you.
If product quality if what you seek, Performance Lab’s products are among the best I know. But if you’re looking for the strongest joint supplement on the market, Flex might not be the one — it’s dosed lightly for daily use. For added support, you can combine Flex with other joint-supportive supplements like Performance Lab Omega-3.
My Score: 8/10
Interested in Performance Lab Flex?
Performance Lab Flex – The Basics
Performance Lab Flex is a premium joint supplement for pain relief, comfortable movement, and full-body mobility.
It works for:
- Seniors with pain and loss of joint function
- Adults who want to protect their long-range joint health
- Athletes and active individuals aiming to improve recovery and reduce the risk of injuries
This product is a healthy alternative to harsh pharmaceutical drugs. While you may not see the same potency, it might give you some relief from joint problems such as arthritis symptoms.
The overall product quality and presentation of Flex is excellent.
Benefits of Performance Lab Flex
- Flex is absorbed within 30-60 minutes of ingestion, depending on factors like your metabolism, and whether you took it with a large meal.
It may take a week or so to start noticing the first benefits. These may include easier movement and less pain. The longer you take it the more noticeable the benefits might get.
Joint supplements like Flex take time to affect deep-rooted inflammation and strengthen your joints to make them more resilient in the long run.
Ingredients
Performance Lab Flex contains:
- CurcuWIN® Turmeric (Curcuma longa) (root) (20% curcuminoids) – 250 mg
- AprèsFlex® Boswellia serrata (gum resin) (20% 3-O-acetyl-11-keto-ß-boswellic acid [AKBA]) – 100 mg
- Glucosamine Sulfate 2KCL (from corn) – 500 mg
- Phytodroitin™ (mucopolysaccharide extract) – 100 mg
- OptiMSM® (Methylsulfony/methane [MSM]) – 100 mg
There is no dead weight in Performance Lab Flex. The only “other ingredients” are NutriCaps® Pullulan Capsule and Nu-FLOW® Rice Concentrate, both patented.
Let’s take a closer look at the active ingredients.
CurcuWIN® Turmeric (Curcuma longa) (root) (20% curcuminoids) – 250 mg
Originating in India, turmeric is known for being one of the healthiest spices in the world. One of its active components, curcumin, is the primary reason for turmeric’s golden color and its health benefits.
- This compound, curcumin, is shown to block inflammatory molecules in our joints, helping to protect joint tissue from damage. It also has anti-oxidant effects, benefiting not just your joint health but also the brain, cardiovascular system, and the gut.1
The dose of 250 mg is a bit low for turmeric supplements, but I actually like this. Turmeric has been linked to negative side effects in rare cases, especially liver injuries, sometimes when used in high doses and combined with black pepper extract for an increased absorption. More of a good thing can eventually become a bad thing.
At the dose of 250 mg per day of a highly bioavailable turmeric, you’re still getting a lot of curcumin, with a low risk of side effects. Plus, Performance Lab says you can double the dose to 4 capsules per day if needed, bringing the turmeric dose to 500 mg per day — well within the studied range.
This flexibility in dosage makes Flex suitable for daily use for many people. That said, studies on turmeric are still inconclusive and of generally low to moderate quality. It won’t work the same for everyone.
AprèsFlex® Boswellia serrata (gum resin) (20% 3-O-acetyl-11-keto-ß-boswellic acid [AKBA]) – 100 mg
Boswellia serrata is a tree resin, also originating from India. This ingredient has analgesic properties; meaning, it relieves pain. This effect helps arthritis sufferers to move with less discomfort. In some cases, it may even completely eliminate pain, depending on your reaction and severity of symptoms.2
- The way Boswellia achieves these benefits is by blocking certain enzymes in the body which cause pain and inflammation. Furthermore, it’s been shown to be anti-cancer and even benefit overall health. This makes Boswellia one of my favorite supplements to take (even on its own).
The dose of 100 mg is usually low, but since this is not a generic Boswellia brand, but a patented and concentrated one, it could still give you noticeable pain relief and other joint health benefits. But as with most supplements, you will need to try Performance Lab Flex for yourself to find out.
Glucosamine Sulfate 2KCL (from corn) – 500 mg
Glucosamine is a compound naturally found in our joint tissue. It is known for benefiting cartilage when supplemented.
- Cartilage is your cushioning tissue around joints. It helps to ensure smooth movement and prevent friction between joints.
While glucosamine studies are a mixed bag, it is generally accepted that glucosamine has the potential to reduce joint pain and improve long-term joint function via its cartilage-nourishing benefits.
The dose of 500 mg per serving is below the recommended amount of 1500 mg per day.3
You’ll often see glucosamine combined with chondroitin, which is the next ingredient on our list.
Phytodroitin™ (mucopolysaccharide extract) – 100 mg
Phytodroitin is a vegan-friendly, patented version of chondroitin, a compound found in your joints. It helps to contribute to joint lubrication for improved flexibility and better shock absorption.
As far as evidence for chondroitin’s joint health benefits, it’s similar as with glucosamine. Some studies show promising results; others not so much.4
However, chondroitin’s safety and light dosage in this case make it a good ingredient to supplement daily for long periods, as this may increase the benefits over time. Many people swear by this supplement so it’s a matter of trying it for yourself to see how you react. Again, though, I have to mention the low dose here; I would prefer to see a much higher number.
OptiMSM® (Methylsulfony/methane [MSM]) – 100 mg
MSM is a sulfur-containing molecule naturally found in our body. It benefits joint health by protecting from oxidative stress and inflammation. You may also notice less pain from MSM.
The only problem here is the dosage; 100 mg is way too low compared to what the studies use as an effective dose.
Performance Lab Flex Side Effects?
Performance Lab Flex contains well-researched ingredients. All of them are included in light dosages. They are also vegan and free of common allergens.
As a result, the risk of side effects from this supplement is extremely low.
- I still advise consulting a physician if you have a medical condition or are taking medications, to make sure this supplement is right for your specific case.
My Experience With Performance Lab Flex
I was using Performance Lab Flex from 27th of May 2024 until around July 2024 (about a month of use). The dosage of 2 capsules per day with food is easy to follow. As someone who can struggle with swallowing big capsules and tablets, Flex never caused any issues in this regard.
I used to have occasional minor joint pain in my knees, hips, ankles, and wrists. When I started using Performance Lab Omega-3, Performance Lab Flex, and a couple of other lifestyle interventions (a teaspoon of black seed oil daily), these occurrences seemingly reduced. Even when they did occur, the pain didn’t appear to be as prononuced.
I can’t say whether these benefits came from Performance Lab Flex alone or a combination of factors, but I believe the supplement helped. The combination with Omega-3s helped also, I believe. From my experience, three key ingredients in supplements that help to minimize joint discomfort for me are: omega-3s, Boswellia Serrata, and bromelain. But that’s going a little off topic now.
In terms of negative reactions, I didn’t notice any. Performance Lab Flex is a safe supplement. Its anti-inflammatory ingredients should, at the same time, enhance your joint comfort, while supporting other areas of health as well.
The shipping process was smooth and fast. I have nothing but good words about the people who work at Performance Lab, including the customer service.
Do I plan on keep taking Performance Lab Flex? Probably not. As of now (updated in 2026), I’m currently focusing on a whole-foods, nutritious, anti-inflammatory diet and some basic supplements. This has been working well for me — I rarely have any joint discomfort at all nowadays (granted, I’m only in my early 30s).
Pricing
You can officially only get Performance Lab Flex from their website: https://www.performancelab.com/products/flex
A box of Performance Lab Flex costs $49, or $1.63/daily serving.
This also includes fast international shipping and friendly customer support. I never had issues ordering Performance Lab products. The price varies depending on which country you’re from.
- All Performance Lab Products—including Flex—come with a 30-day money-back guarantee for first-time buyers.
Final Thoughts on Performance Lab Flex
I rate Performance Lab Flex as a high-quality, gentle joint supplement for daily use. My personal experience with the product was positive; combining it with Performance Lab Omega-3 and a teaspoon of black seed oil each day, I believe it helped my joints without any negative side effects. That said, I can’t say I felt a major difference in how my joints felt.
For someone with significant joint discomfort or stiffness, it might or it might not produce more noticeable effects. Generally, you’ll need to try it for yourself to know, with the approval of your doctor, of course.
Performance Lab Flex contains light ingredient dosages. This is both a downside and an advantage, depending how you look at it.
The advantage is that this makes it healthy for daily, long-term use, with minimal risk of side effects. The downside is that it may not have as potent effects compared to pharmaceuticals or higher-dosed joint supplements.
With everything considered, I give Performance Lab Flex a score of 8/10.
References
- Peng Y, Ao M, Dong B, Jiang Y, Yu L, Chen Z, Hu C, Xu R. Anti-Inflammatory Effects of Curcumin in the Inflammatory Diseases: Status, Limitations and Countermeasures. Drug Des Devel Ther. 2021 Nov 2;15:4503-4525. doi: 10.2147/DDDT.S327378. PMID: 34754179; PMCID: PMC8572027. ↩︎
- Siddiqui MZ. Boswellia serrata, a potential antiinflammatory agent: an overview. Indian J Pharm Sci. 2011 May;73(3):255-61. doi: 10.4103/0250-474X.93507. PMID: 22457547; PMCID: PMC3309643. ↩︎
- Veronese N, Demurtas J, Smith L, Reginster JY, Bruyère O, Beaudart C, Honvo G, Maggi S; on behalf on the European Geriatric Medicine Society Special Interest Groups in Systematic Reviews and Meta-Analyses and Arthritis. Glucosamine sulphate: an umbrella review of health outcomes. Ther Adv Musculoskelet Dis. 2020 Dec 26;12:1759720X20975927. doi: 10.1177/1759720X20975927. PMID: 33488785; PMCID: PMC7768322. ↩︎
- Singh JA, Noorbaloochi S, MacDonald R, Maxwell LJ. Chondroitin for osteoarthritis. Cochrane Database Syst Rev. 2015 Jan 28;1(1):CD005614. doi: 10.1002/14651858.CD005614.pub2. PMID: 25629804; PMCID: PMC4881293. ↩︎
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