Performance Lab Flex Review – Will This Supplement Help Your Joints?

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By Ryan Brennan

Reviewed by Juliana Tamayo, MS, RDN - Last Updated

Performance Lab Flex Review

As we grow older, we start to experience a wide range of pains and aches throughout our bodies. It is a normal part of the aging process and something that we will all deal with at one point or another.

In fact, some of us will experience it sooner rather than later. Exercise, injury, infection, disease, and much more can lead to joint pain. While there are various ways to treat achy and stiff joints, there is no such thing as a one-cure-fits-all. Some people may never get the relief they need.

No matter what the cause of your joint pain is, there is no doubt about the importance of a healthy diet. It is no secret that your body’s performance is directly related to the nutrients you provide it throughout the day, and this is no different with your joints.

There are many joint supplements available today, including Joint Juice and Animal Flex. But among the many different supplements out there that claim to soothe, relieve, and support your joints, ligaments, tendons, and cartilage, Performance Lab Flex might be one of the best. Stay tuned for our Performance Lab Flex review and we will let you know if this is the joint supplement for you! 

Performance Lab Flex Review: Key Facts
Benefits Reduce Joint Pain, Increase Flexibility, Promote Bone Health
Ingredients CurcuWIN Turmeric, ApresFlex Boswellia Serrata, and Glucosamine Sulfate
Pricing $39/bottle
Discounts Up to 25% Off
Company Performance Lab

Get Up To 25% Off Now

What Is Performance Lab Flex?

As we briefly mentioned above, Flex by Performance Lab is a supplement designed to support joint health, including the ligaments, tendons, and cartilage. It is a six-ingredient blend in the form of a capsule, making for easy consumption.

Performance Lab Flex

Performance Lab actually markets this product as a flexibility-enhancer, meaning it will work double-time as protection and a performance booster. You can finally start to say goodbye to joint limitations while reducing joint stiffness and getting other health benefits. 

A variety of people can use this joint supplement and use it in a variety of situations, especially since your joints are one of the most important parts of your body in terms of mobility.

Your joints will face a lot of wear and tear each day, whether you are lifting weights, running or jogging, texting or typing, working, or simply growing older. With Flex, you can get back to the activities you love without having to hide your pain from everyone else.

To give you a better idea of how your joints work and how Performance Lab Flex can help improve them, we will detail everything you need to know below!

Performance Lab Flex

Where Are The Joints Located And What Do They Do?

Joints are everywhere in the body, and there are estimated to be anywhere from 150 to 250 joints in the human body. The definition of a joint, however, comes with a bit of confusion. Most people define it as the point where two bones meet, but others take it a step further and reserve the term for points where two bones connect to promote mobility.

Either way, doctors will classify joints into three different types — synarthroses, amphiarthroses, and diarthroses. Synarthroses, also known as fibrous joints, have no mobility (bones in your skull). Amphiarthroses, also known as cartilaginous joints, come with limited movement (think your spine).

The diarthroses joints, also known as synovial joints, are the most common joints. They contain synovial fluid, which allows total and complete mobility (think knees and shoulders). There are six main types of synovial joints, including:

  1. Pivot Joint – a bone that can allow movement along a single axis (ex: forearm)
  2. Hinge Joint – a joint that opens and closes along one axis (ex: knee, elbow)
  3. Saddle Joint – looks like a saddle that another bone sits on top of like a horse (ex: base of the thumb)
  4. Ball-and-Socket Joint – the round end of a bone sits in the socket of another bone, allowing movement all around (ex: shoulder, hip)
  5. Gliding Joint – bones that meet at a flat surface and glide against each other (ex: wrist)
  6. Condyloid Joint – bones that allow movement without rotation (ex: jaw, fingers)

Pain in any of these joints can cause certain limitations to your daily routine and bring a certain level of discomfort that travels with you throughout the day. If you start to experience any joint pain in the body, you should speak to a professional immediately, so it does not get any worse.

Woman Stretching

What Are The Most Common Causes Of Joint Pain?

Joint pain is experienced by everyone at one point in their life. A large reason for this is that joint pain occurs due to plenty of different reasons.

One of the most common causes will be arthritis, which involves inflammation and tenderness of one or more joints in the body. Believe it or not, there are over 100 different types of arthritis, and they will all get worse with age.

Outside of that, you can expect joint pain as a result of injury, infection, disease, inflammation, lupus, gout, mumps, hepatitis, cancer, fibromyalgia, chondromalacia, rickets, or simply overusing/misusing the joints. The weather has also been known to play a role in joint pain. When the barometric pressure changes all of a sudden, your tendons, muscles, and joints will expand and contract. This could cause joint pain or worsen it if you were already experiencing it.

Joint pain is generally going to be easy to spot. Any pain lasting more than a few days, signs of swollen, red, or tender joints, limited movement, or a joint that looks deformed can all be reasons to visit a specialist.

Runner Stretching

How Do We Typically Treat Joint Pain?

If you are experiencing joint pain, a doctor will have a variety of different treatments to consider. The treatment chosen will likely be determined based on the severity of the pain and the reason it started.

Let us take a look at the different ways you can find joint relief when you need it most:

  • Medication – Surely you have taken ibuprofen, Advil, Aleve, or aspirin when you have pain in our joints. This is typically the first thing to do as a home treatment.
  • Topicals – Bengay is a common topical agent used to soothe aching joints, but Capsaicin is another popular option. These will help release endorphins in the body.
  • Injections – Generally combined with an anesthetic, some doctors will inject a steroid medication directly into the joint. This is not always a permanent solution.
  • Therapy – A physical therapist will be able to pinpoint the cause and find exercises and easy joint movements to help stabilize, recover, and improve function in the joint.
  • Home Care – Some people will elect to wear a brace over the joint, ice the area, rest it, and keep it elevated in the comfort of their own home. This can sometimes do the trick.
  • Supplements – Joint supplements are generally used to help improve recovery time and speed up the process. You should speak with your doctor before taking supplements for joint pain, especially if you are already on certain medications.

Some patients will have to go through a series of treatments before finding the relief they were searching for. Do not get discouraged if one treatment does not work. Keep trying and do not give up on your body because it will not give up on you!

Knee Joint Pain

What Are Glucosamine And Chondroitin?

We have not mentioned glucosamine and chondroitin yet, but these two substances have been known to help relieve joint pain and reduce joint destruction. In fact, these two substances are naturally found in cartilage, which acts as the cushion surrounding your joints.

Glucosamine and Chondroitin are commonly found in joint supplements and provide a lot of benefits to your joints. Let us take a closer look at these two substances:


This compound is commonly found in the outer covering of shellfish. It helps to rebuild cartilage that has been broken down over time. Essentially, it can give you joint support and reduce joint aches. 


This next compound is commonly found in shark cartilage and bovine tissue. Chondroitin acts as a sponge that keeps water inside the cartilage.

Supplementing with these two substances can help restore levels found in cartilage that are known to decrease as we age. Together, they are designed to relieve joint pain, prevent the breakdown of cartilage, and repair cartilage.

Your joint support supplement should always contain this ingredient. 

Does Performance Lab Make Any Claims With Flex?

If you were considering adding Performance Lab Flex to your daily routine, you will be happy to find out that they include both glucosamine and chondroitin in their formula. Outside of that, they combine several other herbs and nutrients to fully support joints, ligaments, tendons, and cartilage.

Performance Lab Flex Bottle and Pills

If you visit their official website, you will see a wide variety of claims made about this product. We will list those claims below, but also break down their ingredients to see if you can truly believe their health claims.

Here is what Performance Lab says you can expect with Flex:

  1. Reduce and prevent pain and swelling in the joints
  2. Soothe joints that are overused on a daily basis
  3. Keep your connective tissue protected
  4. Lubricate joints, making you more flexible
  5. Enhance the synthesis and repair of cartilage
  6. Promote bone density
  7. Vegan-friendly formula with prebiotic-infused capsules
  8. Improved shock absorption in the joints

Performance Lab Flex Box

As you can see, Performance Lab has put together a supplement designed to treat and support overall joint health. You will not feel stiff, achy, or limited in motion and can finally get back to the activities that put a smile on your face. But how does it compare to other joint supplements? Take a look at what sets it apart. 

Performance Lab Flex Ingredients

Now that we have taken a good look at the science and anatomy of joints — as well as what Flex is designed to do — it is time to see if the ingredients match the claims. That is why we often say the ingredient label is the “X that marks the spot” when it comes to supplements.

Performance Lab utilizes six ingredients in Flex that make it a unique joint health supplement. These ingredients are CurcuWIN Turmeric, ApresFlex Boswellia Serrata, Glucosamine Sulfate 2KCL, Mythocondro (Chondroitin Sulfate), OptiMSM (methylsulfonylmethane), and NutriGenesis Strontium.

Flex By Performance Lab Supplement facts

Let us take a closer look at what these ingredients actually do!

CurcuWIN Turmeric

Turmeric has long been touted for its anti-inflammatory properties, but most people probably know it as a spice used in curry powder or seasoning. It comes with a bitter taste and is widely used because of its yellow color.

The color of turmeric comes from its Curcuminoids, one of which is curcumin. Studies suggest curcumin is beneficial because it provides antioxidants, regulates COX-2 enzymes to relax your joints, protects cartilage from damage, increases the synthesis of collagen, and reduces stiffness in the joints. 

CurcuWIN, by Performance Lab, is a form of curcumin designed to work 46x better than typical curcumin. When it comes to joint health, you want further joint support by obtaining a high therapeutic dosage of curcumin. 

Recommended Dosage: 200-500mg per day

ApresFlex Boswellia Serrata

Boswellia Serrata, commonly referred to as Indian frankincense, is extracted from the Boswellia Serrata tree to produce gum resin. It is known to have strong anti-inflammatory benefits, as well as helping to reduce pain.

In fact, boswellic acid has been shown to prevent leukotrienes from forming in the body. These leukotrienes are pro-inflammatory. Of the four boswellic acids in Boswellia Serrata, 5-LO and AKBA are the two most effective. 5-LO works against leukotrienes, while AKBA helps build structure and mobility in the joints.

ApresFlex Boswellia Serrata is a form of this extract by Performance Lab. It uses modern technology to make the extract 52x more effective in Lab Flex while making it stand out from dosages in other joint supplements. 

Recommended Dosage: 100-250mg per day

Glucosamine Sulfate 2KCL

We already discussed glucosamine sulfate in this review. In case you forgot, it is found in the cartilage and contributes to the recovery and regeneration of joints. It is actually an amino sugar that helps create connective tissue as a building block protein.

Supplementing with glucosamine helps soothe and lubricate your joints, while also supplying a more full range of motion. Although it is typically sourced from shellfish, Performance Lab Flex sources theirs from corn, making it vegan-friendly.

Recommended Dosage: 350-600mg per day

Mythocondro (Chondroitin Sulfate)

The other substance we have covered before, chondroitin sulfate, is just as important as glucosamine. In fact, they are both found in the same part of the body — cartilage.

Chondroitin acts as a sponge that helps keep water inside the cartilage. Maintaining hydration is essential to keeping cartilage lubricated and shock-absorbing. It will also help produce collagen, which is important to the structure of cartilage.

Alongside glucosamine, chondroitin sulfate will help grow and repair cartilage for peak performance. The chondroitin sulfate in the Performance Lab Flex’s formula is vegetarian-friendly and will help increase bioavailability by 43%.

Recommended Dosage: 100-250mg per day

OptiMSM (methylsulfonylmethane)

Methylsulfonylmethane, commonly referred to as MSM, is a key nutrient in the formation of collagen in the cartilage. As we know, collagen is essential to the structure and rebuilding of cartilage.

In addition to that, MSM plays a role in maintaining glucosamine and chondroitin. That is why you will see it alongside both of those substances in Performance Lab Flex. Believe it or not, their OptiMSM blend is the only one made in the USA that is GRAS-designated, which makes it much superior to other joint supplements. 

Recommended Dosage: 100-250mg per day

NutriGenesis Strontium

Strontium is a calcium-like trace mineral, which means it has qualities similar to those of calcium. It will actually replace calcium inside the bone due to its higher density. This might give you a false sense of higher bone density, but it does not necessarily mean new bone is being formed.

At the same time, some studies suggest strontium assists in the production of bone-building cells, and also prevents the breakdown of bone. Like the rest of the ingredients in Flex, Performance Lab formulates it themselves to help joint function by supporting physical performance. 

Recommended Dosage: 300-500mcg per day

Performance Lab Flex Pill Capsules

Performance Lab Flex Benefits and Downsides 

Supplements are always tough to buy because no one really seems to know what they are getting. Most supplement labels just throw a bunch of big words and confusing concepts at the consumer in hopes they buy it.

Hopefully, we have done a pretty good job of explaining these concepts and what Performance Lab Flex is intended to do — as well as what you should expect from it.

If you are still not sure if this is the right supplement for you, we will summarize a lot of what we have gone over thus far below. The benefits will heavily outweigh the downsides, but that does not mean this supplement is for everyone!


  • Optimizes joints for flexibility
  • Improves shock absorption and lubricates joints
  • Does not stop at the joints, also supports your ligaments, tendons, and cartilage
  • Provides ingredients that assist in relieving joint aches and other pain
  • Designed for use at work, the gym, at home, or out with friends
  • Protects joints and improves joint recovery
  • Easy on the stomach with prebiotic-infused capsules
  • Free of allergens, banned substances, soy, gluten, synthetic additives, and caffeine
  • Non-GMO, GMP-Certified, Vegan-Friendly, and Non-Irradiated
  • Supports bone mineral density to sustain integrity in bones and joints
  • Boswellia Serrata and curcumin are known to work better together
  • MSM helps joint structure by maintaining chondroitin, glucosamine, collagen, and more
  • Strontium can help boost the production of collagen in cartilage
  • Can easily cut your dosage in half by only taking one capsule per serving (which would save money too)
  • Can be combined with a variety of other Performance Lab supplements
  • Higher dosages from other joint supplements to optimize joint health 
  • Offers a 30-day money-back guarantee 

Flex By Performance Lab Supplement features


  • More scientific evidence is needed to fully understand supplementing with chondroitin and glucosamine
  • Can be expensive at over $1.00 per serving
  • You should take two capsules for one serving, not ideal for those that do not enjoy pills
  • Can only be purchased on their official website

Performance Lab Flex Dosage and Pricing

This joint health supplement comes in a pretty straightforward package. The box is pretty bare and limited on any information. But to make up for it, the story is completely different on their website, which is full of information. The front of the bottle says “Performance Lab” and “Flex,” while the back of the label has ingredients, nutrition facts, and directions.

Performance Lab Flex Pills

Each bottle contains 60 capsules. Each serving is two capsules — enough for a one-month supply. Still, the only place you buy Performance Lab Flex is directly from their website.  For anyone wondering, this formula is also 100% vegan, and easier to digest thanks to the prebiotic-infused NutriCaps® made from fermented tapioca. 

The pricing is as follows:

If you purchase a 3-month supply, Performance Flex will give you a fourth bottle free and you will get free shipping. It also helps that Performance Lab Flex comes with a 30-day money-back guarantee. This means that if you do not love the product, you can return the bottle (even if it is empty) and get a full refund. Of course, this only applies to your first order. 

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Claims vs. Reality

Earlier in this Performance Lab Flex review, we listed out the claims and guarantees made by the company and its Lab Flex supplement. Since then, we have taken a hard look at the ingredients they use, and dosages, and compared the benefits and downsides. By now, we have a pretty good idea of what to expect from Flex.

Performance Lab does a great job of sticking to the scientific research supporting joint health. They do this with all their products, and it is a reason why they are heavily regarded as one of the highest quality supplement providers today.

Boswellia Serrata and curcumin have centuries of use and research supporting them. They are known to be a power duo and play a role in flexibility, they also reduce joint pain, and improve overall function/performance. The addition of strontium adds to this effect.

In addition to that, the use of glucosamine sulfate and chondroitin sulfate provides a mounding amount of support to your cartilage. This will assist in shock absorption, relieve pain, and improve cartilage recovery. The addition of MSM helps this process become that much more effective.

It is pretty clear that the claims and guarantees match what this product actually does for your joints. If you take a look at the customer reviews, you will see that it remains true for a majority of people as well!

Performance Lab Flex Bottle

Final Verdict: Performance Lab Flex

Joint pain affects millions of people each year and will only get worse as we continue to age. In fact, over 22% of all adults have been diagnosed with arthritis, a number that is higher in women (23.5%) than men (18.1%).

In addition to that, nearly half of all those people will suffer from limitations in their life, meaning they will not be able to do the things they once enjoyed doing on a regular basis. Some of the most common ailments with age include knee pain, achy joints, and osteoarthritis pain. When you age you also stop having a healthy collagen production rate, which diminishes your joint lubrication and other structural joint proteins. 

Those facts do not even take into account the joint pain we experience every day from overuse, injury, or infection. It is no wonder so many people are in search of joint relief and want a joint supplement. 

For anyone suffering from joint pain or joint limitations, you will not want to neglect the power of therapy, home care, rest, and proper medication. If your doctor suggests that medication will not be necessary, supplements can help you receive a natural boost each day.

If you are looking for a joint support supplement that helps from all angles, Performance Lab Flex is the supplement for you. It is one of the best you will find on the market and is worth the purchase — especially if you want to finally find relief from that joint pain!

You can also buy Performance Lab Flex without worrying about the price too much thanks to their 30-day money-back guarantee. Get the boost you need in maintaining joint function and reducing joint pain! 

More reviews of Performance Lab products:

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Ryan Brennan

Ryan Brennan is a health and fitness writer with both personal and professional experience in the field. His passion for nutrition stems from personal experiences dealing with malnutrition, low energy, and other health complications. Through research and experimentation, Ryan was able to overcome these issues and take control of his health. He now aims to help others do the same. Ryan has been writing about nutrition, fitness, and supplementation for the past 7 years. He also has experience in the field, serving as the manager of a high-end fitness facility in Las Vegas, NV where he currently resides.