General Supplement Questions

Are Proprietary Blends Bad?

| 2 min read
Quick Answer

Proprietary blends are not inherently dangerous, but they are a major red flag for quality. They legally allow manufacturers to hide individual ingredient dosages behind a single total weight, making it impossible to verify whether any ingredient is present at a clinically effective dose.

Proprietary blends are one of the supplement industry's most controversial practices.

What Is a Proprietary Blend?

A proprietary blend is a mixture of ingredients listed under a single name with only the total combined weight disclosed. For example: "ThermoBurn Blend (750 mg): Green Tea Extract, Caffeine, Cayenne, L-Carnitine, CLA." You know the total is 750 mg, but you have no idea how much of each ingredient is included.

Why Companies Use Them

Companies cite two reasons:

  • Competitive protection: They claim the exact formula is a trade secret. In reality, most supplement ingredients are well-known, and the real "secret" is usually the low dosages.
  • Marketing advantage: A long ingredient list looks impressive. By using a proprietary blend, a company can list 15 "researched" ingredients while potentially including most at dust-level doses.

The Real Problem

Proprietary blends prevent consumers from evaluating whether a product can actually work. Consider: a product claims to contain green tea extract and references studies showing 400 mg EGCG daily reduces body fat. The product uses a proprietary blend totaling 800 mg with 8 ingredients. Most likely, no single ingredient reaches its clinical dose.

FDA Regulations

Under DSHEA (1994), proprietary blends are perfectly legal. The FDA requires only that ingredients be listed in descending order by weight and that the total blend weight be disclosed. This is a significant regulatory gap.

How to Evaluate Products With Proprietary Blends

Divide the total blend weight by the number of ingredients. If the average per-ingredient amount is well below clinical doses for the key ingredients, the product is almost certainly underdosed. Better yet, choose products that fully disclose every ingredient dose.

Our Position

We consider proprietary blends a significant negative factor in our reviews. A product cannot score highly if we cannot verify whether its ingredients are present at researched doses. The best supplement companies are transparent about every ingredient amount.

Make Smarter Supplement Decisions

Our Buyer's Guide walks you through everything you need to know before purchasing any supplement — from reading labels to spotting scams.

This content is for informational purposes only and does not constitute medical advice. Always consult a healthcare professional before starting any supplement regimen.