What the order of ingredients means
Ingredients are printed heaviest first. That single rule is the most under-used piece of information on a supplement label, and it turns a list of names into a set of numbers you can test.
Dietary ingredients inside a blend are listed in descending order of predominance by weight, which 21 CFR 101.36 requires. Position one is therefore the heaviest and the last position is the lightest, and nothing on the label says by how much.
The useful consequence is that the ingredient in position k can weigh at most the blend total divided by k. Position one gives you almost nothing, because its ceiling is the whole blend. The last position gives you the most, because its ceiling is the smallest and because it also sets a floor for everything above it.
What the regulation requires
The requirement is short. Dietary ingredients that are declared inside a proprietary blend are listed in descending order of predominance by weight, and 21 CFR 101.36 is where that sits. The same principle governs the ordinary ingredient list on a food package, which is why the first word on a cereal box matters.
“Descending order” means each ingredient weighs no more than the one above it and no less than the one below it. That is all it means. It carries no information about the size of the gaps, and two adjacent names might differ by a factor of fifty or by a single milligram.
What predominance by weight means once extracts are involved
Weight means the weight of the material as it goes into the capsule, not the weight of the active compound inside it. An extract standardized to 10% of a marker compound and an extract standardized to 1% of the same compound weigh the same per milligram and differ tenfold in what they deliver.
The same applies to carriers. Extracts are routinely supplied on a carrier — maltodextrin, rice flour, silica — and that carrier is part of the declared weight of the ingredient. A 300 mg extract on a 50% carrier is 150 mg of extract, and the label is not obliged to tell you which it is.
Why that matters more than the order itself
Ordering by weight is a rule about mass, and mass is only a proxy for dose. Where a label states a standardization figure, the proxy is a good one. Where it states none — which is most labels — the order tells you about the contents of the capsule rather than about the dose anyone receives.
Why position one tells you almost nothing
The first ingredient is the one marketing leads with, and it is the position that carries the least information. Its ceiling is the entire blend total, because nothing above it constrains it, so the only thing the label guarantees about it is that it is not lighter than the second.
That is a very weak guarantee. In an eight-ingredient blend position one might be seven-eighths of the total or it might be one-eighth plus a milligram, and both are compliant. The label is identical either way.
The trap this sets
A reader who sees a well-studied botanical listed first naturally reads it as the main ingredient, and it is — by weight, which is not the same as by effect. If that ingredient has no established human dose, being first tells you nothing at all, because there is no figure to hold its generous ceiling against.
The position also says nothing about cost or about intent. Cheap bulk material sits comfortably at the top of a list and is the obvious place to put weight if weight is what a total has to reach.
Why the last position tells you the most
The last name on a blend is the most informative line on the panel, for two separate reasons, and neither is obvious at first reading.
One: its ceiling is the tightest
The ceiling at position k is the total divided by k, so the last position has the smallest ceiling of all. In an eight-ingredient 1,200 mg blend that is 150 mg. Where position one permits almost anything, the last position permits very little, and a claim about the last ingredient is therefore the easiest claim on the whole label to test.
Two: it sets a floor for everything above it
This is the part people miss. Descending order means every ingredient is at least as heavy as the last one. So if the last ingredient weighs w, all n ingredients weigh at least w each, and the total is at least n times w. Turn that around: the last ingredient tells you what the whole blend is obliged to spend before anything else is considered.
That floor is what makes two ingredients in the same blend capable of excluding each other. A dose required near the top forces a large minimum on the positions above it and leaves a smaller remainder for the tail; a dose required at the bottom forces a large minimum on the tail. When the second minimum exceeds the first remainder, the two doses cannot coexist.
The ceiling, proved in two lines
The proof is short enough to check in your head, and it is worth checking, because the whole method rests on it.
- Let the blend total be T and let the ingredient in position k weigh w. Descending order means positions 1 through k−1 each weigh at least w, so positions 1 through k together weigh at least k × w.
- Those k positions are part of the blend, so they cannot weigh more than the total: k × w ≤ T. Divide both sides by k and w ≤ T ÷ k.
The mirror image is equally short. Positions k through n each weigh at most w, but they also each weigh at least the weight of the final position, which gives the floor described above: T ≥ n × wlast.
Both results hold for any total, any number of ingredients and any split, because both use nothing except the ordering rule and the fact that the parts sum to the whole. Neither requires anything the manufacturer chose to disclose.
A worked division, in case the algebra is unwelcome
Eight ingredients share 1,200 mg. Could the fourth be 400 mg? If it were, the three above it would each be at least 400 mg too, giving at least 1,600 mg for the top four alone. That is more than the blend contains, so no. The fourth is at most 1,200 ÷ 4 = 300 mg.
The limits of the method
Everything above produces upper bounds. It is worth being blunt about what that excludes, because a ceiling used as an estimate produces confident nonsense.
- A ceiling is not an estimate. It is the largest value consistent with the label. The actual amount can be anywhere from that ceiling down to a trace.
- An ingredient can sit far below its ceiling. Position two of a 1,200 mg blend has a 600 mg ceiling and could contain 2 mg. Every line on the panel would read exactly the same.
- Only one position can be at its ceiling at a time. If position one is the whole total, everything below it is zero, which no real formula is. The ceilings are individually possible and collectively impossible.
- Ceilings cannot be added. The eight ceilings in the table below sum to far more than 1,200 mg. That is expected and it is why the ceiling is used one row at a time.
- Weight is not potency. Without a standardization figure, a milligram of extract cannot be compared with a milligram used in a trial.
- The ceiling is silent about quality. Identity, species, plant part, contamination and shelf life are all outside what any arithmetic on a panel can reach.
So the method proves one kind of statement and one only: that a particular dose is not available at a particular position. Everything else it produces is a permission rather than a finding, and a permission is not evidence that anybody took it up.
The eight on this label, in order
SodaPeak declares one blend of 1,200 mg shared by eight ingredients, printed in the order below. The ceiling column is the total divided by the position number; the dose column is the lowest human dose we were able to verify for each, which is the reading most favorable to the product.
| # | Ingredient | Ceiling | Lowest studied dose | What the position allows |
|---|---|---|---|---|
| 1 | Horny Goat Weed Extract | 1,200 mg | none established | No dose to compare |
| 2 | Tongkat Ali Powder | 600 mg | 100 mg | Position allows it |
| 3 | Saw Palmetto Extract | 400 mg | 320 mg | Position allows it |
| 4 | Nettle Extract | 300 mg | 360 mg | Forbidden by position |
| 5 | Wild Yam Extract | 240 mg | none established | No dose to compare |
| 6 | Sarsaparilla | 200 mg | none established | No dose to compare |
| 7 | Orchic Substance | 171.4 mg | none established | No dose to compare |
| 8 | Boron Amino Acid Chelate | 150 mg | 60 mg | Position allows it |
Scroll this table sideways →
Read the top of that table and the point about position one makes itself. Horny goat weed is first and could be anything up to the entire 1,200 mg, and there is no established oral human dose to compare that against, so its generous ceiling supports no conclusion in either direction.
Read the fourth row and the method does its one decisive thing. Nettle root’s ceiling is 300 mg and its trials used 360 mg a day. The position forbids the dose outright, whatever the split, and no further information would change it.
Read the last row and the floor argument applies. Boron sits eighth with a 150 mg ceiling. If it were at the 60 mg its studies used, every one of the eight positions would be at least 60 mg, committing 480 mg of the total before any ingredient rises above the minimum — and that constraint is what collides with saw palmetto at position three.
The full budget →The collision, proved →All eight, with their evidence →
References
The sources behind the numbers on this page.
- U.S. Government Publishing Office21 CFR 101.36 — Nutrition labeling of dietary supplements, including the proprietary blend and descending-order requirements — Code of Federal Regulations · source
- Safarinejad — 2005Urtica dioica for treatment of benign prostatic hyperplasia: a prospective, randomized, double-blind, placebo-controlled, crossover study — Journal of Herbal Pharmacotherapy · DOI 10.1080/J157v05n04_01 · PMID 16635963 · source
- Bent, Kane, Shinohara et al. — 2006Saw palmetto for benign prostatic hyperplasia — New England Journal of Medicine · DOI 10.1056/NEJMoa053085 · PMID 16467543 · source
- Nielsen, Hunt, Mullen, Hunt — 1987Effect of dietary boron on mineral, estrogen, and testosterone metabolism in postmenopausal women — The FASEB Journal, volume 1 · DOI 10.1096/fasebj.1.5.3678698 · PMID 3678698 · source
- Brown, Wang, Hajduczok et al. — 2019Pharmacokinetics and safety of icariin in healthy adults: a randomized, double-blind, placebo-controlled dose escalation — Natural Product Communications · DOI 10.1177/1934578X19856789 · source
- Chinnappan, Rahmat, Mohamed et al. — 2021Efficacy of Eurycoma longifolia (Physta®) on testosterone and quality of life in men aged 50 to 70 — Food & Nutrition Research · DOI 10.29219/fnr.v65.5647 · source
See the SodaPeak packs
One, three or six bottles. The price is on the seller’s checkout page, because it is the one figure this site was never given — and a figure we were not given is not a figure we will print.
Shipping and the guarantee term are shown at checkout. This site publishes no number it was not able to verify.