PlainVitamins

Zma

by MET-Rx · capsule · 90 capsules

  • On the market (NIH)
  • UPC 7 86560 12151 4
  • DSLD label 73338
  • Serving 3 capsules
  • 30 servings

Zma by MET-Rx lists 3 ingredients, 3 with an amount per serving of 3 capsules, such as 10.5 mg of vitamin B6, 450 mg of magnesium and 30 mg of zinc. Its current label entered the NIH Dietary Supplement Label Database on April 25, 2017.

What is in Zma?

Each row as the label prints it, per serving of 3 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).

Zma: Supplement Facts rows against the market (DSLD label 73338, January 2026 release)
IngredientAmount% DVAmong products listing it
Vitamin B6as Pyridoxine HydrochlorideVitamin B-6 (Form: as Pyridoxine Hydrochloride)10.5 mg618%Vitamin B6 in ZMA against 15,277 products10.5 mg per serving; the middle half of products list 2 mg to 20 mg, the median 6 mg.DV 1.7 mgUL 100 mg10.5 mg

Higher than 65% of 15,277 products listing vitamin B6 (median 6 mg).

Magnesiumas Magnesium Citrate, Magnesium OxideMagnesium (Form: as Magnesium Citrate, and Magnesium Oxide)450 mg107%Magnesium in ZMA against 14,003 products450 mg per serving; the middle half of products list 30 mg to 200 mg, the median 86 mg.UL 350 mgDV 420 mg450 mg

Higher than 95% of 14,003 products listing magnesium (median 86 mg). 1.3 times the adult UL a day.

Zincas Zinc Aspartate, Zinc L-MonomethionineZinc (Form: as Zinc L-Monomethionine, and Zinc Aspartate)30 mg273%Zinc in ZMA against 13,186 products30 mg per serving; the middle half of products list 5 mg to 15 mg, the median 11 mg.DV 11 mgUL 40 mg30 mg

Higher than 90% of 13,186 products listing zinc (median 11 mg).

Source: NIH ODS Dietary Supplement Label Database, label 73338 (entered April 25, 2017), 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?

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:

  • At 1 serving a day, the most its directions give, the label lists 450 mg of magnesium, 1.3 times the adult Tolerable Upper Intake Level.

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?

6 products list the very same ingredients; the nearest amounts come first.

  • ZmaPrecision Engineered · off the market same ingredients
  • ZMA Mineral Support FormulaGood 'N Natural · off the market same ingredients
  • ZmaScientific Nutrition For Advanced Conditioning SNAC · off the market same ingredients
  • ZMA With OptizincPrecision Engineered same ingredients
  • ZmaSci-Fit same ingredients
  • Max ZMAMM Sports Nutrition same ingredients

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
For best results, take three (3) capsules daily, preferably right before bed.
Directions: For adults, take three (3) capsules daily, preferably right before bed. For best results, avoid taking with dairy or other calcium-containing foods or supplements.
Warnings
Warning: If you are pregnant, nursing, taking any medications or have any medical condition, consult your doctor before use.
Discontinue use and consult your doctor if any adverse reactions occur.
Keep out of reach of children.
Tamper Resistant: Do not use if seal under cap is broken or missing.
For best results, avoid taking with dairy or other calcium-containing foods or supplements.
Storage
Store at room temperature and avoid excessive heat.

Source: label statements in DSLD label 73338.

What else is on the label?

Other ingredients: Gelatin, Vegetable Magnesium Stearate.

How many labels does Zma have?

4 labels are on file under this name since February 23, 2012: other sizes, label designs and reformulations. The current one leads this page.

  1. Label 73338 (current) Entered April 25, 2017 · on the market · 90 capsules · UPC 7 86560 12151 4
  2. Label 63181 Entered July 25, 2016 · off the market March 30, 2017 · 90 capsules · UPC 7 86560 12151 4
  3. Label 15509 Entered November 21, 2012 · off the market February 5, 2016 · 90 capsules · UPC 7 86560 12151 4
  4. Label 6537 Entered February 23, 2012 · off the market November 1, 2012 · 90 capsules · UPC 7 86560 12151 4

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

Who makes it?

The label names MET-Rx Nutrition, Inc. (manufacturer), Boca Raton, FL. All MET-Rx products.

Where next?