PlainVitamins

TestRX

by TestRX · capsule · 120 capsules

  • On the market (NIH)
  • DSLD label 274914
  • Serving 2 capsules; amounts per 4 capsules
  • 30 servings

TestRX by TestRX lists 7 ingredients, 7 with an amount per serving of 4 capsules, such as 1,140 IU (28.5 mcg) of vitamin D3, 20 mcg of vitamin K2, 5 mg of vitamin B6 and 200 mg of magnesium. Its current label entered the NIH Dietary Supplement Label Database on August 23, 2022.

What is in TestRX?

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

TestRX: Supplement Facts rows against the market (DSLD label 274914, January 2026 release)
IngredientAmount% DVAmong products listing it
Vitamin D3as Cholecalciferol1,140 IU (28.5 mcg)285%Vitamin D in TestRX against 14,175 products28.5 mcg per serving; the middle half of products list 10 mcg to 25 mcg, the median 15 mcg.DV 20 mcgUL 100 mcg28.5 mcg

Higher than 77% of 14,175 products listing vitamin D (median 15 mcg). Per day at the most servings: 57 mcg.

Vitamin K220 mcg25%Vitamin K in TestRX against 4,607 products20 mcg per serving; the middle half of products list 35 mcg to 100 mcg, the median 80 mcg.DV 120 mcg20 mcg

87% of 4,607 products listing vitamin K give more (median 80 mcg). Per day at the most servings: 40 mcg.

Vitamin B6as Pyridoxine Hydrochloride5 mg250%Vitamin B6 in TestRX against 15,277 products5 mg per serving; the middle half of products list 2 mg to 20 mg, the median 6 mg.DV 1.7 mgUL 100 mg5 mg

51% of 15,277 products listing vitamin B6 give more (median 6 mg). Per day at the most servings: 10 mg.

Magnesiumas Magnesium Aspartate200 mg50%Magnesium in TestRX against 14,003 products200 mg per serving; the middle half of products list 30 mg to 200 mg, the median 86 mg.UL 350 mgDV 420 mg200 mg

Higher than 75% of 14,003 products listing magnesium (median 86 mg). Per day at the most servings: 400 mg. 1.1 times the adult UL a day.

Zincas Zinc Aspartate, Zinc Monomethionine10 mg67%Zinc in TestRX against 13,186 products10 mg per serving; the middle half of products list 5 mg to 15 mg, the median 11 mg.DV 11 mgUL 40 mg10 mg

51% of 13,186 products listing zinc give more (median 11 mg). Per day at the most servings: 20 mg.

D-Aspartic Acid2,300 mgD-Aspartic Acid in TestRX against 134 products2.3 g per serving; the middle half of products list 1 g to 3 g, the median 2.3 g.2.3 g

49% of 134 products listing D-aspartic acid give more (median 2.3 g). Per day at the most servings: 4.6 g.

Fenugreekas Saponins300 mgFenugreek in TestRX against 628 products300 mg per serving; the middle half of products list 100 mg to 600 mg, the median 300 mg.300 mg

44% of 628 products listing fenugreek give more (median 300 mg). Per day at the most servings: 600 mg.

Source: NIH ODS Dietary Supplement Label Database, label 274914 (entered August 23, 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:

  • 87% of the 4,607 products that print an amount of vitamin K list more than its 20 mcg of vitamin K (median 80 mcg).
  • At 2 servings a day, the most its directions give, the label lists 400 mg of magnesium, 1.1 times the adult Tolerable Upper Intake Level.

The NIH database records 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?

The products whose ingredient lists overlap most with TestRX's, rare ingredients counting for more.

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
Recommended Use: Take 2 capsules in the morning, and 2 capsules in the afternoon with 8oz of water. Do not exceed 4 capsules in a 24-hour period. Best taken with meals. It is recommended to consult your health care provider before beginning any nutritional program.
Warnings
Keep out of reach of children.
Do not exceed 4 capsules in a 24-hour period.
Storage
Store in cool, dry place.

Source: label statements in DSLD label 274914.

What else is on the label?

Other ingredients: Gelatin, Silicon Dioxide, Magnesium Stearate.

How many labels does TestRX have?

One label is on file, entered on August 23, 2022.

  1. Label 274914 (current) Entered August 23, 2022 · on the market · 120 capsules

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

Who makes it?

The label names TestRX (manufacturer). All TestRX products.

Where next?