Best Offers

SUPPLEMENT BUYING GUIDE / U.S. EDITION

Read the label.
See the whole picture.

A supplement is more than a promising headline. Understand the ingredients, compare the real cost, and know what to ask before you buy.

Start with the checklist

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A CLOSER LOOK

ILLUSTRATION · NOT A PRODUCT LABEL

Supplement
Facts

Serving size Read first

Servings per container Compare

IngredientAmount

Named ingredient Check dose

Proprietary blend Look closer

What is in it?
How much is in each serving?
Does the evidence match?

The details matter
more than the headline.
01 / INGREDIENTS02 / EVIDENCE03 / COST04 / TERMS

BEFORE YOU BUY

Four checks.
A more informed choice.

Keep this guide next to the seller's product page. A missing detail is a reason to ask a question.

01

Start with the complete label.

Look for the ingredient names, amounts per serving, suggested use, and other ingredients. A proprietary blend may leave individual amounts unclear.

Your label checklist
  • Full Supplement Facts panel and ingredient list
  • Serving size and servings per container
  • Allergens, directions, and warnings
  • Manufacturer's name and contact details
02

Read evidence with context.

A study on an ingredient does not automatically prove that a finished product will give the same result. Check the studied formulation, dose, participants, and measured outcome.

Questions about research
  • Was the actual product studied, or only an ingredient?
  • Was the dose comparable to the labeled serving?
  • What outcome was measured, and over what period?
  • Can you read the source rather than only an advertising summary?
03

Compare the total price.

Use the checkout total, including shipping and tax. Compare cost per serving, then check whether the purchase is one-time or a recurring subscription.

Use the cost calculator ↗
04

Check who you are buying from.

Review delivery terms, refund eligibility, return costs, and how to contact the seller. Keep a copy of the terms that apply when you order.

Questions for the seller
  • Who fulfills the order and handles support?
  • Is there a recurring charge or optional upsell?
  • When does the return period begin?
  • Are opened bottles eligible, and who pays return shipping?

MAKE THE NUMBERS CLEAR

The sticker price
is only the start.

Compare a package by its servings, rather than bottle count alone. This calculator stays on your device; the prices you enter are not sent to us.

Use labeled servings. This tool does not recommend a dose.

$
Enter the package details to compare.

YOUR NEXT STEP

Take your questions
to the product page.

No supplement offer is featured in this guide. Use the checklist to evaluate a supplement you are considering.

Read the NIH consumer guide ↗

OUR REFERENCE POINTS

NIH Office of Dietary Supplements: consumer guide / FDA: dietary supplements

Editorial update: October 11, 2026. These sources do not endorse this publisher or any linked product. Dietary supplements are not approved by FDA for safety and effectiveness before sale.