Decoding Supplement Proprietary Blends: Under-Dosing Tricks and Deceptive Labels

A proprietary blend is a group of ingredients listed under one name with one combined weight, so you can see what is in the tub but not how much of each ingredient you are getting. That is why proprietary blends in supplements are the easiest place to hide an under-dosed formula. A “5,000 mg Energy Matrix” sounds serious, but without individual amounts you cannot tell whether it is mostly useful ingredients or mostly cheap filler.

This guide gives you a simple forensic toolkit: how the label rules work, a dose-math check you can do in 60 seconds, and a buying rule that saves money. It sits inside our wider guide to evidence-based fitness supplements, which covers what is actually worth buying.

What is a proprietary blend, and is it legal?

Yes, it is legal. A 2023 paper by authors from the NIH Office of Dietary Supplements, the FDA and an industry association explains that the Dietary Supplement Health and Education Act of 1994 lets companies list non-nutrient dietary ingredients as a proprietary blend to protect their unique formula. The total weight of the blend and the names of the ingredients inside must be declared, but not the amounts of each one (Saldanha et al., 2023).

The same paper makes a point that matters to lifters: because of this, a label alone cannot tell you the dose of an ingredient in a blend, which also makes it hard to work out intakes or compare with clinical trial doses.

Think about what that means in the gym. Studies test ingredients at specific doses. If your tub hides its doses, you cannot check whether it matches anything that was tested.

Why do companies use proprietary blends?

Two reasons, one fair and one less so.

The fair one: protecting a formula from copycats. Some blends contain botanical extracts where the exact ratio really is a trade secret.

The less fair one: it makes the label impossible to audit. A 2013 pharmacy journal review of pre-workout ingredients notes that pre-workouts typically contain proprietary blends of multiple ingredients, that labels often do not disclose all ingredients or their precise amounts, and that evidence for the combination products is scant, inconclusive or conflicting (Eudy et al., 2013).

This is not limited to pre-workout powders. An analysis of the label panels of 75 top-selling energy drinks and shots in the US found 15 products with proprietary blends containing undisclosed ingredient amounts (Jagim et al., 2022). So roughly one in five of that sample used the format.

I cannot tell you a given brand is cheating. What I can say is that a hidden dose is a dose you cannot defend.

How do under-dosing tricks work?

There are three patterns I would watch for. None proves bad intent, but all of them make dose checking impossible.

1. Fairy dusting. A real but tiny amount of an expensive ingredient is added so the name can sit on the front of the tub. The ingredient is there, the effect is not.

2. Stimulant padding. Caffeine is cheap and you can feel it, so a formula can seem “strong” because of caffeine while the other ingredients do very little. In that case the effect you feel may come almost entirely from the caffeine, which you could buy on its own for much less.

3. Name stacking. A long ingredient list creates the impression of a complete formula. But the total weight of a scoop is fixed. Every extra ingredient fights for the same few grams.

A five-step label check

1. Check the serving size. Make sure the numbers are per scoop, and that the scoop is the one you will really use. Some labels list a half serving.
2. Look for a milligram amount beside every active ingredient. If a name sits inside a blend with no number, count it as unverified.
3. Compare amounts with studied doses. The next section shows how.
4. Add up stimulants. Caffeine, plus anything else with a stimulant effect, plus your usual coffee or chai.
5. Check price per serving. Compare it with buying caffeine and the main ingredients on their own.

The 60-second dose math

Here is the check that exposes a lot of blends. Take the ingredients named on the front of the label and add up the doses used in research. If the sum exceeds the blend’s total weight, the blend cannot contain all of them at those doses. It is simple arithmetic.

Use doses from the evidence:

• Citrulline malate: one trial in 15 resistance-trained women used 8 g of citrulline malate taken one hour before training, and found more reps over six sets than placebo (Glenn et al., 2017). That is a small acute study, so treat it as a reference point and not a guarantee.
• Beta-alanine: the ISSN reports that 4-6 g daily for at least 2-4 weeks improves performance, and that divided doses of about 1.6 g can reduce tingling (Trexler et al., 2015).
• Caffeine: the ISSN says 3-6 mg/kg body mass consistently improves performance, and the minimum effective dose may be as low as 2 mg/kg (Guest et al., 2021).

Now run an illustrative example for an 80 kg lifter. Caffeine at 3 mg/kg is 240 mg. Add 1.6 g of beta-alanine and 8 g of citrulline malate:

8,000 + 1,600 + 240 = 9,840 mg.

A “5,000 mg Energy Matrix” cannot hold that, and it also lists taurine, tyrosine and green tea extract. At least one ingredient is under-dosed relative to the studies. That does not mean the product is dangerous or useless (a stimulant dose may still make you feel switched on). It means you are not buying what the ingredient list implies.

For the ingredient-level evidence, see our dedicated guides on citrulline malate vs pure L-citrulline and beta-alanine and the tingles.

Can I trust the numbers on a clear label?

Mostly, but not blindly. Even a transparent label is only as honest as the manufacturing behind it.

A small study bought three samples each of nine popular sports supplements over nine months and tested them. Many products did not contain the same number and amount of stimulants every time. In five of the six caffeinated products, caffeine varied from -7% to +266% against the first measurement, and some products contained other stimulants such as synephrine or ephedrine in variable amounts (Attipoe et al., 2016). The authors say the sample was too small for statistical analysis, so this is a warning sign, not a market-wide verdict.

What to do with that:

• Start a new tub at a half scoop and see how you feel.
• Avoid stacking multiple stimulant products.
• Prefer brands that publish test results, and read our guide on third-party supplement certifications to know what a seal does and does not cover.

Proprietary blend vs transparent label: a quick comparison

What you want to know	Proprietary blend	Fully transparent label
Dose of each ingredient	Hidden	Listed in mg
Compare with studies	Not possible	Possible
Spot fairy dusting	Very hard	Easy
Risk of unknown stimulant load	Higher, since caffeine may not be itemised	Lower
Best for	Nobody, unless the brand shows its full doses elsewhere	Anyone who wants to control dose

Some companies publish their full formulas on a website even when the tub shows a blend. If you can find every amount in writing, you are back in the transparent column.

What should I buy instead? A simple rule

The golden rule is easy: if a product hides doses, treat it as unproven and move on. Plenty of brands label every ingredient, and many lifters need less than they think.

For most people, the useful part of a pre-workout is caffeine. For a 70-80 kg lifter, 3 mg/kg is roughly 210-240 mg, which is about two cups of strong filter coffee or a tablet, at a fraction of the cost. Work out your number with the caffeine dosage calculator. Individual response varies, and genetics may play a part in sleep and anxiety effects, which we cover in how CYP1A2 genetics change caffeine response.

If you want to build a pre-workout yourself from separate ingredients, we go through that in how to spot proprietary blends and build a DIY pre-workout. If you are shopping in India, our guide to FSSAI rules and spotting fake protein covers labeling and counterfeits.

Who should be careful with pre-workouts?

Pre-workout products are stimulant-heavy, and the review of pre-workout ingredients lists adverse effects reported with them, including gastrointestinal symptoms, cardiac arrhythmia, higher blood pressure and possible effects on lipids and glucose, with risk rising if users take more than recommended or combine products (Eudy et al., 2013).

See a doctor before using stimulant products if you have a heart condition, high blood pressure, anxiety or sleep problems, are pregnant or breastfeeding, or take regular medication. Stop and get medical help if you get chest pain, a racing or irregular heartbeat, or fainting. Hidden doses make it harder for you and your doctor to know what you actually took.

The bottom line

A proprietary blend is legal, but it hides the one number that lets you judge a product. Add up the studied doses, compare them with the blend weight, and buy only labels that show every dose. Most of what a pre-workout does for you can come from a measured amount of caffeine, and your training, protein and sleep matter far more than any scoop. Start with a free plan from our workout plans, then decide whether you need a supplement at all.