Flex
by Performance Lab · capsule · 60 capsules
- On the market (NIH)
- UPC 6 17401 62510 9
- DSLD label 335005
- Serving 2 capsules
- 30 servings
Flex by Performance Lab lists 5 ingredients, 5 with an amount per serving of 2 capsules, such as 250 mg of CurcuWIN, 100 mg of ApresFLEX, 500 mg of glucosamine sulfate potassium chloride and 100 mg of phytodroitin. Its current label entered the NIH Dietary Supplement Label Database on July 24, 2025.
What is in Flex?
Each row as the label prints it, per serving of 2 capsules. The capsule beside an amount places it among every product in the NIH database that lists the same ingredient: the bar is the middle half of their amounts, the line in it the median, the whiskers the 10th and 90th percentiles; the green tick is the FDA Daily Value and the red dashed tick the adult upper limit (IOM).
| Ingredient | Amount | % DV | Among products listing it |
|---|---|---|---|
| CurcuWINas Turmeric20% curcuminoids | 250 mg | Higher than 57% of 2,369 products listing turmeric (median 150 mg). Per day at the most servings: 500 mg. | |
| ApresFLEXas Boswellia serrata20% 3-O-acetyl-11-keto-B-boswellic acid [AKBA] | 100 mg | 53% of 665 products listing boswellia give more (median 135 mg). Per day at the most servings: 200 mg. | |
| Glucosamine Sulfate Potassium Chlorideas Corn | 500 mg | 65% of 875 products listing glucosamine sulfate give more (median 1 g). Per day at the most servings: 1 g. | |
| Phytodroitinas Mucopolysaccharide Extract | 100 mg | 77% of 47 products listing chondroitin (unspecified) give more (median 400 mg). Per day at the most servings: 200 mg. | |
| OptiMSMas Methylsulfonylmethane | 100 mg | 78% of 1,454 products listing methylsulfonylmethane give more (median 500 mg). Per day at the most servings: 200 mg. |
Source: NIH ODS Dietary Supplement Label Database, label 335005 (entered July 24, 2025), version 9.4.0. See the label on DSLD or its label image (PDF). Amounts are what the maker printed; DSLD does not test products. Daily Values: the FDA's Daily Value page.
Is that a lot?
Every amount on this label with a position sits within the middle 80% of the products that list the same ingredient.
The NIH database records 1 to 2 servings a day from the label's directions; its % Daily Values are for adults and children 4 or more years of age. The directions as printed are further down this page.
The Tolerable Upper Intake Level is the most of a nutrient per day, from food, water and supplements together, that is likely to pose no risk for almost all adults (Institute of Medicine, 2011). It does not apply under medical supervision. This page compares labels; it is not medical advice.
Sources: amounts from the DSLD label; Daily Values from 21 CFR 101.9(c)(8)(iv); adult upper limits from the Institute of Medicine's DRI summary tables (2011). How positions are computed.
Which products have the closest formulas?
The products whose ingredient lists overlap most with Flex's, rare ingredients counting for more.
- Mega Joint 4xGreeNatr Premium 3 shared, 57% alike
- Glucosamine Chondroitin MSM & Burdock RootVimerson Health 3 shared, 56% alike
- Joint SupportZenwise 4 shared, 55% alike
- Two Daily Glucosamine Sulfate 1500 mgSolaray · off the market 3 shared, 52% alike
- Joint Pain Complex PowderTerraVita Premium Collection 3 shared, 52% alike
- Joint Pain Complex 450 mgTerraVita Premium Collection 3 shared, 52% alike
Source: ingredient lists of every product's current label in DSLD (version 9.4.0); similarity weights each shared ingredient by how rare it is.
What does the label say about taking it?
Quoted from the label as DSLD transcribed it: the maker's words, including any claim about what the product does, which the FDA has not evaluated and PlainVitamins does not endorse.
- Directions
- Suggested use: Take 2 capsules daily. For additional soothing joint support take 2 capsules immediately after physical activity. For best results use daily and consistently.
- Warnings
- Warning: Do not use if pregnant, nursing or under the age of 18. Consult with your doctor before taking this or any supplement if you have, or suspect, a medical condition and are taking any medication.
- Warning: Do not use if pregnant, nursing or under the age of 18. Keep out of reach of children.
- If you experience any adverse reactions from taking this product discontinue immediately and contact your doctor and report to 908-280-1066. Do not use if safety seal is broken or missing.
- Allergens and what it does not contain
- Suitable for vegans: Contains no soy, egg, fish, shellfish, dairy, peanut, tree nuts, wheat, or other allergens. Non-GMO and non-irradiated. Free of gluten, caffeine, synthetic additives, artificial colors and preservatives. BPA-free
- Storage
- Store in a cool dry place.
Source: label statements in DSLD label 335005.
What else is on the label?
Other ingredients: Pullulan, NuFlow.
Seals and symbols as the label prints them (the maker's; a certifier's own list confirms a seal): Vegan Vegetarian Society Approved Certified B Corporation.
How many labels does Flex have?
2 labels are on file under this name since July 24, 2025: other sizes, label designs and reformulations. The current one leads this page.
- Label 335005 (current) Entered July 24, 2025 · on the market · 60 capsules · UPC 6 17401 62510 9
- Label 331695 Entered July 24, 2025 · off the market February 18, 2025 · 60 capsules · UPC 6 17401 62510 9
Source: DSLD label entry and market events, version 9.4.0 (labels entered through September 25, 2025).
Who makes it?
The label names Performance Lab USA Corporation (manufacturer), Winter Park, Florida. All Performance Lab products.