What is a proprietary blend in supplements?
Last updated: June 2026 · Reviewed by the FactoWiki Editorial Team for clarity and source accuracy
A proprietary blend lists several ingredients together under a single total weight, without revealing how much of each one is included. That hidden dosing makes it hard to judge whether a formula is effective — or safe.
Key takeaways
- A proprietary blend hides the dose of each individual ingredient.
- It prevents you from knowing if active ingredients are meaningfully dosed.
- It can disguise under-dosing or cheap fillers — a reason for caution.
What a proprietary blend is
On a supplement label, a proprietary blend appears as a named mix — say, “Energy Blend 500 mg” — followed by a list of ingredients, but with only the total weight shown, not the amount of each one. Companies justify this as protecting a “secret recipe” from competitors. The practical effect, though, is that you — the buyer — can’t tell whether that 500 mg is mostly one cheap ingredient or contains a meaningful dose of the ones that matter.Why it's a problem
The trouble with hidden dosing is that effectiveness and safety both depend on amounts. An ingredient might have great evidence at, say, 300 mg, but a blend could contain a token sprinkle of it behind a large filler — a tactic sometimes called “fairy dusting,” where impressive-sounding ingredients appear on the label at doses too low to do anything. Blends also make it harder to assess stimulant content or judge interactions, because you simply don’t know how much of each component you’re taking.How to handle them
Proprietary blends aren’t automatically a scam, but they shift information away from you and toward the seller, so they warrant caution. Where possible, favour products that fully disclose every ingredient’s dose — a sign of confidence and transparency. If a product you’re interested in uses a blend, look for at least the order of ingredients (listed by weight) and any disclosed key doses, and weigh the lack of transparency against the alternatives. When two products are otherwise similar, the fully disclosed one is the safer bet.Key ingredients to understand
If you’re weighing up a weight & metabolism product, these are two of the ingredients worth knowing about — what they may do, and where the evidence stands:
- Green Tea Extract (EGCG) — Green tea extract concentrates the antioxidant catechins found in green tea, especially EGCG. Drinking green tea is healthy, but concentrated extracts have an important safety cave…
- L-Carnitine — L-carnitine is an amino-acid derivative that helps shuttle fatty acids into cells to be burned for energy. It is marketed for fat loss and exercise, but the weight-loss evidence is…
What to check before you buy
Across every category, the same rules apply: look for fully disclosed doses (not hidden proprietary blends), realistic language, clear seller details and refund terms, and credible source links. Treat any “cure”, “guaranteed” or “instant” claim as a red flag, and loop in a healthcare professional if you take medication or manage a condition.
Frequently asked questions
Why do companies use proprietary blends?
Officially to protect a recipe; in practice it hides individual doses, which can disguise under-dosing of key ingredients.
What is “fairy dusting”?
Adding impressive-sounding ingredients at doses too small to have an effect, hidden within a blend’s total weight.
Should I avoid all proprietary blends?
Not necessarily, but prefer fully disclosed labels — when products are otherwise similar, the transparent one is the safer choice.
Related on FactoWiki
- Weight & Metabolism supplements — the full category
- Green Tea Extract (EGCG) — ingredient guide
- L-Carnitine — ingredient guide
- Java Burn review
- FlashBurn review
This article is general information, not medical advice. FactoWiki may earn a commission from links on product review pages (never on comparisons). Always check with a qualified healthcare professional about your own situation.