What a proprietary blend actually is
US labeling rules allow manufacturers to group ingredients into a named blend and disclose only the blend's total weight, not each component's amount. The stated rationale is protecting formulas from copycats; the practical effect is that buyers cannot tell whether any single ingredient reaches a meaningful dose.
Why the hidden dose is the whole game
Supplement ingredients that work in studies work at specific amounts. Ashwagandha's stress findings used 240–600 mg of standardized extract; berberine's glucose findings used 900–1,500 mg. A blend totaling 800 mg across nine ingredients mathematically cannot deliver studied doses of more than one or two of them — if any.
Use ingredient-order math
Ingredients inside a blend must be listed in descending order by weight. That yields a useful ceiling: the second-listed ingredient cannot exceed half the blend if the first is at least equal, and anything listed sixth in a 500 mg blend is present at under 100 mg, often far under. This estimate is rough, but it reliably exposes fairy-dusted formulas.
Recognize fairy dusting
Fairy dusting is including a famous ingredient at a trace amount so its name can anchor the marketing. The tell: a headline ingredient buried deep in a blend's ingredient order, with the ad copy quoting studies whose doses the product cannot possibly contain.
When a blend is tolerable
A blend is least problematic when the total is large relative to studied doses of its components, when the headline ingredients also appear with disclosed amounts outside the blend, or when the ingredient is effective at tiny doses anyway (like some enzymes). Absent those, treat the blend as unverifiable.
How we handle blends in reviews
In Article Heaven reviews, undisclosed amounts are recorded as exactly that — 'Not disclosed' — and the evidence grade applies to the ingredient at studied doses, never to the product's unknown quantity. A formula that hides its doses forfeits the benefit of the doubt; that's a scoring choice we make openly.
Keep reading
Related guides: How to Read a Supplement Label Before You Buy · How Supplement Money-Back Guarantees Actually Work · 'FDA-Registered Facility' and Other Label Claims, Decoded. Or see these principles applied in any of our product reviews.