PlainVitamins

Natural Flex

by DaVinci Laboratories · capsule · 90 capsules

  • On the market (NIH)
  • UPC 0 26664 24449 9
  • DSLD label 304020
  • Serving 1 capsule
  • 90 servings

Natural Flex by DaVinci Laboratories lists 4 ingredients, 4 with an amount per serving of 1 capsule, such as 20 mg of vitamin C, 4 mg of manganese, 500 mg of glucosamine sulfate sodium and 400 mg of chondroitin sulfate. Its current label entered the NIH Dietary Supplement Label Database on December 14, 2023.

What is in Natural Flex?

Each row as the label prints it, per serving of 1 capsule. 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).

Natural Flex: Supplement Facts rows against the market (DSLD label 304020, January 2026 release)
IngredientAmount% DVAmong products listing it
Vitamin Cas Manganese Ascorbate20 mg22%Vitamin C in Natural Flex against 18,583 products20 mg per serving; the middle half of products list 60 mg to 270 mg, the median 100 mg.DV 90 mgUL 2,000 mg20 mg

90% of 18,583 products listing vitamin C give more (median 100 mg). Per day at the most servings: 60 mg.

Manganeseas Manganese Ascorbate4 mg174%Manganese in Natural Flex against 7,016 products4 mg per serving; the middle half of products list 1 mg to 3.92 mg, the median 2 mg.DV 2.3 mgUL 11 mg4 mg

Higher than 75% of 7,016 products listing manganese (median 2 mg). Per day at the most servings: 12 mg. 1.1 times the adult UL a day.

Glucosamine Sulfate Sodiumas Crab, Shrimp500 mgGlucosamine Sulfate in Natural Flex against 875 products0.5 g per serving; the middle half of products list 0.5 g to 1.5 g, the median 1 g.0.5 g

65% of 875 products listing glucosamine sulfate give more (median 1 g). Per day at the most servings: 1.5 g.

Chondroitin Sulfate400 mgChondroitin Sulfate in Natural Flex against 950 products400 mg per serving; the middle half of products list 200 mg to 1,200 mg, the median 400 mg.400 mg

48% of 950 products listing chondroitin sulfate give more (median 400 mg). Per day at the most servings: 1,200 mg.

Source: NIH ODS Dietary Supplement Label Database, label 304020 (entered December 14, 2023), 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:

  • 90% of the 18,583 products that print an amount of vitamin C list more than its 20 mg of vitamin C (median 100 mg).
  • At 3 servings a day, the most its directions give, the label lists 12 mg of manganese, 1.1 times the adult Tolerable Upper Intake Level.

The NIH database records 3 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?

6 products list 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
Suggested Use: As a dietary supplement, take 1 capsule three times daily with a meal or as directed by your healthcare practitioner.
Warnings
Warning: If pregnant or nursing, consult your healthcare practitioner before taking this product.
Keep out of reach of children.
Contains: Shrimp and crab.
To obtain product information or report a serious adverse event, call 1-800-325-1776.
Allergens and what it does not contain
Gluten Free
Storage
Store in a cool, dry place.

Source: label statements in DSLD label 304020.

What else is on the label?

Other ingredients: Hypromellose, Leucine, Silicon Dioxide.

How many labels does Natural Flex have?

2 labels are on file under this name since April 21, 2023: other sizes, label designs and reformulations. The current one leads this page.

  1. Label 304020 (current) Entered December 14, 2023 · on the market · 90 capsules · UPC 0 26664 24449 9
  2. Label 288099 Entered April 21, 2023 · off the market October 1, 2022 · 90 capsules · UPC 0 26664 24449 9

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

Who makes it?

The label names DaVinci Laboratories a division of FoodScience LLC (distributor), Williston, VT. All DaVinci Laboratories products.

Where next?