What a Proprietary Blend Hides on a Supplement Label
TPBy the TrustedPurchaseReview Editorial Team
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The short answer
A proprietary blend lists several ingredients under one name with one total weight. US rules require the total and the order of the ingredients, from largest to smallest, but not the amount of each one. That order still tells you something: the ingredient in position number k can be at most the total divided by k. If a blend has 22 ingredients in 200 mg, the last one is 9 mg or less.
Most supplements we review use at least one proprietary blend. We read the US labeling rule for dietary supplements and the guidance from Operation Supplement Safety, a Department of Defense program, then applied both to seven labels from our reviews. This guide is general information, not medical or legal advice.
What a Proprietary Blend Is
A proprietary blend is a group of ingredients sold under one name. It may be called a blend, a complex, a matrix or a formula, and it often has a brand name of its own. On the Supplement Facts panel it shows up as one line with one weight, and the ingredients are listed under it.
What the Label Must Show
The US rule for supplement labels, 21 CFR 101.36, sets three requirements for a blend:
| Required | Not required |
|---|---|
| A name for the blend | The amount of each ingredient inside it |
| The total weight of the blend | Any proof the amounts match research |
| The ingredients listed from largest to smallest by weight | The ratio between ingredients |
One exception helps you: vitamins and minerals that have a Daily Value still need their own amount and percent Daily Value, even when they sit inside a blend. Everything else can stay hidden behind the total.
How to Estimate Each Amount in a Blend
The order is the key. Because ingredients go from largest to smallest, no ingredient can weigh more than any ingredient above it. That gives you a ceiling for every position:
| Position in a 200 mg blend | Highest possible amount |
|---|---|
| 1st | 200 mg (the whole blend) |
| 2nd | 100 mg |
| 5th | 40 mg |
| 10th | 20 mg |
| 22nd | About 9 mg |
The rule is simple: the ingredient in position k can be at most the total divided by k. The real amount can be much lower, because the label does not say how the weight is split. This is a ceiling, not an estimate of the true dose.
Now compare that ceiling with the dose used in research. If a study used 500 mg of an ingredient and it sits tenth in a 200 mg blend, the product cannot come close, no matter how the rest is split.
When Proprietary Blends Matter Most
Operation Supplement Safety says hidden amounts matter most when a blend contains stimulants, such as caffeine. With a blend, you cannot tell how much you are taking, and that matters if you drink coffee, take medication or are sensitive to stimulants.
It also matters for ingredients with known interactions. A blend can list an ingredient that affects blood sugar, blood clotting or how drugs work, without telling you the dose. If you take prescription medication, show the full label to your pharmacist.
Seven Supplement Labels We Checked
| Product | Blend | What the math shows |
|---|---|---|
| Cognizil | 15.47 mg, 21 ingredients | Under 1 mg per ingredient on average |
| Olivaro | 200 mg, 22 ingredients | The last ingredient is about 9 mg or less |
| Sugar Reset | 200 mg, 22 ingredients | Same ceiling as Olivaro |
| Phytomem One | 458 mg, 10 ingredients | Berberine is last, so about 46 mg or less |
| NeuroMind Pro | 151 mg, 7 ingredients | No caffeine amount stated |
| FIMAVYN | 112 mg, 4 botanicals | 6 of 10 ingredients have printed doses |
| GutSave | Two probiotic blends, 12.5 mg each | Doses printed for 6 of 8 lines |
The last two show that a blend is not all or nothing. FIMAVYN and GutSave print most of their doses and keep only a small part inside a blend, which leaves you much more to check. For probiotics, the blend also hides the live count. Our guide to probiotic CFU vs mg covers that.
Proprietary Blend Label Checklist
| Check | Good sign | Red flag |
|---|---|---|
| 1. How much is hidden | Most ingredients have their own amount | Everything sits inside one blend |
| 2. Blend size | Big enough for the ingredients listed | Many ingredients in a few milligrams |
| 3. Key ingredient position | The advertised ingredient comes first | The advertised ingredient comes last |
| 4. Stimulants | Caffeine amount printed | Caffeine sources with no amount |
FAQ
What does proprietary blend mean on a supplement label?
Are proprietary blends legal?
How can I estimate the amount of an ingredient in a blend?
Why do companies use proprietary blends?
Are proprietary blends dangerous?
Sources
- US Code of Federal Regulations: 21 CFR 101.36, Nutrition labeling of dietary supplements, paragraph (c) on proprietary blends.
- Operation Supplement Safety, US Department of Defense: What does “proprietary blend” mean on supplement labels?
- TrustedPurchaseReview reviews of Cognizil, Olivaro, Sugar Reset, Phytomem One, NeuroMind Pro, FIMAVYN and GutSave, label details as published in each review.
About the editorial team
Written by the TrustedPurchaseReview editorial team. We read official labels and sales pages and check them against published research and government sources. We do not buy or test the products ourselves. We earn affiliate commissions on some links in our reviews, and ratings are not for sale.
Questions or corrections? Contact us.
This guide is informational and not medical advice. It has no affiliate links. Some of the reviews it links to contain affiliate links.