Hmb

by GNC Pro Performance · tablet or pill · 240 tablets

  • On the market (NIH)
  • UPC 0 48107 06412 9
  • DSLD label 18416
  • Serving 4 tablets
  • 60 servings

Hmb by GNC Pro Performance lists 2 ingredients, 2 with an amount per serving of 4 tablets, such as 1,000 mg of calcium hydroxymethyl butyrate monohydrate and 200 mg of monopotassium phosphate. Its current label entered the NIH Dietary Supplement Label Database on February 25, 2013.

What is in Hmb?

Each row as the label prints it, per serving of 4 tablets. 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).

Hmb: Supplement Facts rows against the market (DSLD label 18416, January 2026 release)
IngredientAmount% DVAmong products listing it
Calcium Hydroxymethyl Butyrate Monohydrate1,000 mgCalcium hydroxymethylbutyrate in HMB against 97 products1 g per serving; the middle half of products list 0.945 g to 1.5 g, the median 1.5 g.1 g

60% of 97 products listing calcium hydroxymethylbutyrate give more (median 1.5 g). Per day at the most servings: 3 g.

Monopotassium Phosphate200 mg4%*

The label names the compound (Monopotassium Phosphate); its amount is likely the compound's weight, not the potassium it holds, so it is not placed among other products.

* % Daily Value computed from the printed amount and the FDA Daily Value (21 CFR 101.9); the label prints none for that row.

Source: NIH ODS Dietary Supplement Label Database, label 18416 (entered February 25, 2013), version 9.4.0. See the label on DSLD. 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 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?

2 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
DIRECTIONS: As a dietary supplement, take four tablets three times a day with meals. Do not exceed recommended intake levels.
Warnings
KEEP OUT OF REACH OF CHILDREN.
Storage
Store in a cool, dry place.

Source: label statements in DSLD label 18416.

What else is on the label?

Other ingredients: Dicalcium Phosphate, Cellulose, Vegetable Acetoglycerides.

How many labels does Hmb have?

2 labels are on file under this name since November 25, 2011: other sizes, label designs and reformulations. The current one leads this page.

  1. Label 18416 (current) Entered February 25, 2013 · on the market · 240 tablets · UPC 0 48107 06412 9
  2. Label 2708 Entered November 25, 2011 · off the market December 26, 2012 · 240 tablets · UPC 0 48107 06412 9

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

Who makes it?

The label names General Nutrition Corporation (distributor), Pittsburgh, PA. All GNC Pro Performance products.

Where next?