PlainVitamins

Supplement ingredients

The most common ingredient on U.S. supplement labels is vitamin c, listed by 19,919 of the 116,682 products in the NIH Dietary Supplement Label Database, January 2026 release (17%); calcium and vitamin b6 follow. Each ingredient page shows how much products list, against the Daily Value and the upper limit (DSLD version 9.4.0).

Which ingredients do supplements list most?

The 20 ingredients listed by the most products (Supplement Facts rows of current labels; nutrition-panel rows such as calories, carbohydrate, sugar, fat, protein and sodium left out)
RankIngredientProductsShare of all
1Vitamin C19,91917.1%
2Calcium19,72416.9%
3Vitamin B615,64413.4%
4Vitamin D15,30713.1%
5Magnesium15,08812.9%
6Vitamin B1214,77412.7%
7Zinc13,75111.8%
8Niacin12,77911.0%
9Vitamin E12,20710.5%
10Potassium12,16610.4%
11Folate12,11210.4%
12Vitamin A11,5969.9%
13Pantothenic Acid (Vitamin B5)10,3438.9%
14Riboflavin10,1268.7%
15Thiamin10,1238.7%
16Biotin9,6968.3%
17Iron8,6967.5%
18Chromium8,1697.0%
19Selenium7,9346.8%
20Manganese7,3356.3%

Source: NIH ODS Dietary Supplement Label Database version 9.4.0; 116,682 products (one per product name and brand).

Every ingredient, by class

A to Z inside each class; the number is how many products list the ingredient. Open a class to see its ingredients.

Vitamins 20
Minerals 33
Botanicals 886
Amino acids and proteins 72
Fats and fatty acids 96
Probiotics 52
Enzymes 42
Fiber and carbohydrates 68
Other dietary ingredients 603
Other ingredients (fillers, capsules, coatings, listed outside the Supplement Facts box) 92