PlainVitamins

Flex

by AdvoCare · capsule · 60 capsules

  • On the market (NIH)
  • DSLD label 265365
  • Serving 2 capsules
  • 30 servings

Flex by AdvoCare lists 9 ingredients, 8 with an amount per serving of 2 capsules, such as 400 mg of L-proline, 100 mg of L-glycine, 100 mg of L-serine and 100 mg of L-threonine; 1 sits inside a blend without its own amount. Its current label entered the NIH Dietary Supplement Label Database on May 19, 2022.

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).

Flex: Supplement Facts rows against the market (DSLD label 265365, January 2026 release)
IngredientAmount% DVAmong products listing it
L-Proline400 mgProline in FLEX against 387 products400 mg per serving; the middle half of products list 100 mg to 1,289 mg, the median 487.5 mg.400 mg

52% of 387 products listing proline give more (median 487.5 mg).

L-Glycine100 mgGlycine in FLEX against 1,078 products100 mg per serving; the middle half of products list 100 mg to 846 mg, the median 300 mg.100 mg

64% of 1,078 products listing glycine give more (median 300 mg).

L-Serine100 mgSerine in FLEX against 314 products100 mg per serving; the middle half of products list 100 mg to 1,056 mg, the median 408 mg.100 mg

74% of 314 products listing serine give more (median 408 mg).

L-Threonine100 mgTHREONINE in FLEX against 590 products100 mg per serving; the middle half of products list 140 mg to 886.25 mg, the median 500 mg.100 mg

77% of 590 products listing THREONINE give more (median 500 mg).

L-Methionine100 mgMETHIONINE in FLEX against 981 products100 mg per serving; the middle half of products list 25 mg to 250 mg, the median 100 mg.100 mg

42% of 981 products listing METHIONINE give more (median 100 mg).

L-Histidine100 mgHistidine in FLEX against 591 products100 mg per serving; the middle half of products list 50 mg to 402.8 mg, the median 125 mg.100 mg

54% of 591 products listing histidine give more (median 125 mg).

UC-II standardized Cartilage40 mgCartilage in FLEX against 199 products40 mg per serving; the middle half of products list 40 mg to 750 mg, the median 100 mg.40 mg

57% of 199 products listing cartilage give more (median 100 mg).

Total Collagen10 mgCollagen in FLEX against 1,008 products0.01 g per serving; the middle half of products list 0.1 g to 4.2 g, the median 1 g.0.01 g

90% of 1,008 products listing collagen give more (median 1 g).

undenatured Type II Collagenno amount given

Source: NIH ODS Dietary Supplement Label Database, label 265365 (entered May 19, 2022), 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?

The rows in the top or bottom tenth of the products that list the same ingredient, and any above the adult upper limit at the most servings a day the directions give:

  • 57% of the 199 products that print an amount of cartilage list more than its 40 mg of UC-II standardized cartilage (filed by NIH under cartilage) (median 100 mg).
  • 90% of the 1,008 products that print an amount of collagen list more than its 0.01 g of total collagen (filed by NIH under collagen) (2 rows of the label added together) (median 1 g).

The NIH database records one serving 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?

1 product lists the very same ingredients; the nearest amounts come first.

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
Directions For Use: Take 2 capsules, once per day on an empty stomach.
Warnings
Note: Check with your healthcare professional before using this product.
Keep out of reach of children.
Storage
Store away from excessive heat, light and humidity.

Source: label statements in DSLD label 265365.

What else is on the label?

Other ingredients: Microcrystalline Cellulose, Gelatin, L-Leucine.

Seals and symbols as the label prints them (the maker's; a certifier's own list confirms a seal): Informed Sport We Test-You Trust. Listed with: Informed Sport or Informed Choice (a seal is the label's claim; the certifier's own list confirms it).

How many labels does Flex have?

One label is on file, entered on May 19, 2022.

  1. Label 265365 (current) Entered May 19, 2022 · on the market · 60 capsules

DSLD also links this label to: Flex (image difference, same product).

Source: DSLD label entry and market events, version 9.4.0 (labels entered through September 25, 2025).

Who makes it?

The label names AdvoCare International, LLC (distributor), Richardson, TX. All AdvoCare products.

Where next?