PlainVitamins

L-Proline

by NutraBio · powder · 5.3 ounces

  • On the market (NIH)
  • UPC 6 49908 23429 4
  • DSLD label 309343
  • Serving 2 g (1 Scoop)
  • 75 servings

L-Proline by NutraBio lists one ingredient: 2 g of L-proline per serving of 2 g. Its current label entered the NIH Dietary Supplement Label Database on March 22, 2024.

What is in L-Proline?

Each row as the label prints it, per serving of 2 g. 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).

L-Proline: Supplement Facts rows against the market (DSLD label 309343, January 2026 release)
IngredientAmount% DVAmong products listing it
L-ProlineHPLC2 gProline in L-Proline against 387 products2,000 mg per serving; the middle half of products list 100 mg to 1,289 mg, the median 487.5 mg.2,000 mg

Higher than 91% of 387 products listing proline (median 487.5 mg). Per day at the most servings: 4,000 mg.

Source: NIH ODS Dietary Supplement Label Database, label 309343 (entered March 22, 2024), 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:

  • Its 2,000 mg of L-proline (filed by NIH under proline) is higher than 91% of the 387 proline products that print an amount; 25 list more.

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?

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, add 1 scoop (2 grams) to your favorite beverage 1-2 times daily, or as directed by a physician.
Warnings
Warning: Not intended for use by persons under the age of 18. Keep out of the reach of children.
If you are pregnant, breast feeding, have known medical conditions (including kidney or liver disease) or are taking prescription or OTC medication(s) consult with your health care practitioner before using this product.
Discontinue use two weeks prior to surgery.
Allergens and what it does not contain
Non-GMO Gluten free Lactose free No excipients, no fillers, allergen free, no artificial color, flavor or sweetener, no preservatives, no starch, no sugar, no soy, no wheat, no yeast, no fish, no milk, sodium free.
Storage
Store in a cool dry place.

Source: label statements in DSLD label 309343.

What else is on the label?

Seals and symbols as the label prints them (the maker's; a certifier's own list confirms a seal): Manufactured in our GMP & FDA Inspected facility FDA Registration: 16906175560; Made in USA With ingredients sourced worldwide; OU (Kosher).

How many labels does L-Proline have?

4 labels are on file under this name since January 25, 2020: other sizes, label designs and reformulations. The current one leads this page.

  1. Label 309343 (current) Entered March 22, 2024 · on the market · 5.3 ounces · UPC 6 49908 23429 4
  2. Label 248247 Entered July 27, 2021 · on the market · 5.3 ounces · UPC 6 49908 23429 4
  3. Label 239153 Entered November 21, 2020 · off the market March 24, 2021 · 5.3 oz · UPC 6 49908 23429 4
  4. Label 213035 Entered January 25, 2020 · off the market August 17, 2020 · 5.3 oz · UPC 6 49908 23429 4

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

Who makes it?

The label names NutraBio Labs, Inc. (manufacturer), Middlesex, NJ. All NutraBio products.

Where next?