Guide
How to read a proprietary blend
The most useful skill this product teaches, and it has nothing to do with this product. A proprietary blend hides every individual amount — and the rule permitting it also forces a hard ceiling on every ingredient in it. Here is how to compute one, on any blend, in any shop.
The method in one line: divide the blend total by the ingredient’s position in the list. The FDA requires blend ingredients “in descending order of predominance by weight”, so if six items total 570 mg, the fourth cannot exceed 570 ÷ 4 = 142.5 mg. That is a ceiling rather than an amount, and it is not printed anywhere on the bottle.
The rule, in the FDA’s words
Everything below follows from one paragraph of federal labelling guidance, quoted here in full.
FDA — Dietary Supplement Labeling Guide, Chapter IV
“You must identify proprietary blends by use of the term “Proprietary Blend” or an appropriately descriptive term or fanciful name. On the same line, you must list the total weight of all “other dietary ingredients” contained in the blend. Indented underneath the name of the blend, you must list the “other dietary ingredients” in the blend, either in a column or linear fashion, in descending order of predominance by weight.”
Three obligations. The blend must be named; its total weight must appear on the same line; and its constituents must be listed underneath in descending order of predominance by weight. Conspicuously absent is any requirement to print an individual weight.
That absence is not an oversight. Elsewhere the same guidance requires an individual weight for every ingredient with an established Daily Value — which is why a vitamin and a mineral are itemised on this panel and six other substances are not. The rule asks for figures where a reference intake exists to compare them against, and does not ask where none does.
A label using a proprietary blend is therefore not breaking a rule. It is using one, correctly, to its limit. Any useful reading starts there rather than from indignation.
What the total weight tells you
The total is the first of the two things you are given, and it does more work than most readers realise.
- It caps everything. No constituent can weigh more than the total. Trivial, and still the first bound you have.
- It sets the scale against the rest of the panel. Here the itemised rows come to 31 mg and the blend to 570 mg, of 601 mg declared: the part a buyer can check is about 5% of the capsule, the part they cannot about 95%. That ratio is computable on any panel in ten seconds.
- It bounds the average. Six ingredients in 570 mg average 95 mg each. That says nothing about any individual constituent, but it gives the order of magnitude — and a blend totalling 50 mg across twelve items has told you something decisive already.
What the total cannot do is distribute itself. A blend of six at 570 mg could be one ingredient at 565 mg and five at a milligram each, or six at 95 mg exactly, and the printed label is identical either way. Anyone who tells you what a blend contains ingredient by ingredient is quoting a document you have not seen, or making it up.
What descending order tells you
The second thing you are given is not a number at all. It is an ordering, and it is where the useful arithmetic comes from. Descending order means the first-listed ingredient weighs at least as much as the second, the second at least as much as the third, and so on. From that constraint plus the total, a hard upper bound follows for every position. The argument is one sentence long:
The whole of the reasoning
If the item in position n weighed more than the total divided by n, then the n items at or above it — each of which weighs at least as much as it does — would together weigh more than the total. That is impossible. So the item in position n cannot exceed the total divided by n.
Notice what the argument does not need: no chemistry, no cooperation from the manufacturer, nothing beyond the two things every compliant blend must print. It works on a blend of three and a blend of thirty, in a shop aisle, on a telephone.
Notice too that the bound tightens as you go down the list. The first item is bounded only by the total, which is no help. The last of six is bounded at a sixth of it, which is a real constraint. The longer the list, the more informative the tail and the less informative the head.
Computing the ceiling, position by position
The arithmetic, once. Take the total on the blend line, count the position of the ingredient you care about starting at one, and divide.
| Position | Formula | Ceiling on a 570 mg blend | Share of the total |
|---|---|---|---|
| 1st | 570 ÷ 1 | 570 mg | All of it, so no help at all |
| 2nd | 570 ÷ 2 | 285 mg | A half |
| 3rd | 570 ÷ 3 | 190 mg | A third |
| 4th | 570 ÷ 4 | 142.5 mg | A quarter |
| 5th | 570 ÷ 5 | 114 mg | A fifth |
| 6th | 570 ÷ 6 | 95 mg | A sixth, the tightest bound here |
Two notes. The ceilings cannot all be attained at once: six ingredients at their individual ceilings would total far more than 570 mg. And the bound on the last position is the bound on the smallest ingredient, so a long blend guarantees something in it is small. If a panel prints a blend without a total, or lists constituents alphabetically, the method fails.
The worked example: six ingredients, 570 mg
This product’s blend, run through the method: six constituents, a printed total of 570 mg, and six ceilings that follow. None of the figures below is printed on the bottle, and all six are forced by it.
Read the bars as what each ingredient cannot exceed. The second row does the most work here: L-carnitine is bounded at 285 mg, and the NIH records athletic-performance studies using 1 to 4 grams a day — so the ceiling is at most a quarter of the lowest studied dose. The bottom row is the other instructive one: saffron cannot exceed 95 mg, and being last it is also the constituent most likely to sit far below its ceiling.
What a ceiling is, and what it is not
This is the part to get right: a ceiling misread as an amount produces confident statements that are false.
What a ceiling is
- A true statement. “At most 285 mg” stays correct whatever the real figure turns out to be.
- Derived from the label alone. No inside information and no estimate went into it.
- Useful against a published dose. If the ceiling is already below what anyone has studied, you have learned something decisive without knowing the amount.
- Tighter further down the list. Position is the whole of the information.
What a ceiling is not
- An amount. “285 mg” would be an invented number.
- A typical value. There is no distribution to be typical of. The true figure could be one milligram.
- Evidence the ingredient is present in a useful quantity. A floor cannot be computed from a blend at all.
- A criticism by itself. It tells you what the label permits you to know, which is separate from what is in the capsule.
The asymmetry matters: descending order gives an upper bound and never a lower one. You can prove an ingredient is not large; you can never prove it is not vanishing. That is what a proprietary blend costs a reader.
What to do with the answer
Having computed a ceiling, four things are worth doing with it, in order.
- Set it against a published dose. Find the ingredient at the NIH Office of Dietary Supplements or NCCIH and read what the studies used. If the ceiling is below the bottom of that range, the true amount has become much less interesting. If no monograph exists — as it does not for four of the six here — note that too, and note that it cuts both ways.
- Check whether it is something you already take. You cannot add ceilings up, but you can at least see whether stacking is possible.
- Ask the distributor for the breakdown. Nothing obliges anyone to answer, and the manufacturer knows every figure because somebody set them. This site sets out who to ask and what to ask for.
- Decide what the disclosure is worth to you. A judgement rather than an arithmetic, and yours. The method tells you what you are and are not being told; it does not tell you what to buy.
One habit is worth building out of all this. On any panel, before reading a single ingredient name, find the blend line, divide the total by the number of constituents, and look at the average. Ten seconds, and it tells you more about the formulation than the front of the box ever will.
Applied to the bottle this site sells, the method gives an uncomfortable result: 570 of 601 mg — about 95% of the capsule by weight — is knowable only as six ceilings. That was reached with nothing but a printed total, a printed order and division.
Read the blend row first, then decide
Thirty capsules, one a day. Two named nutrients with percentages that both check out, and then 570 of the 601 milligrams in the capsule inside a proprietary blend with no amounts on it. The live price and the 60-day return terms are both on the seller’s checkout screen.
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