Supplement guides

Choose an ingredient or take a closer look at gummies. Each guide explains what to know before you buy.

Supplement ShortlistContent checked

Creatine

Find out what creatine does and how to read the label.

Protein

Whey and casein are types of protein. See what powders add and how their servings compare.

Gummies

Check what’s in a serving and how gummies compare with powder. No gummy picks yet.

Electrolytes

How water and electrolyte drinks differ, including sodium and sugar.

Magnesium

A guide to magnesium labels and common safety questions.

Need help reading a label?

The label basics explain serving sizes, ingredient amounts and % Daily Value.

Learn the label basics

What was actually studied?

A study on an ingredient does not answer every question about the products that contain it. Check what the researchers actually tested.

Sources: NIH: Supplement questions

Taking medicines?

A pharmacist can check a supplement against your medicines. Bring the full label, including the serving size and other ingredients.

Read the safety guidance

Sources: FDA: Medicine interactions

Take a closer look

Sources

  1. NIH Office of Dietary Supplements: Frequently Asked Questions (opens in a new tab)
  2. FDA: Mixing Medications and Dietary Supplements (opens in a new tab)