If you have spent any time reading supplement labels, you have likely encountered the phrase “proprietary blend” followed by a list of ingredients and a single total weight. No individual amounts. No way to know how much of each ingredient you are actually taking.
This is not an accident. It is a deliberate labeling strategy — and in most cases, it works against you as a consumer.
This guide explains what proprietary blends are, why the supplement industry relies on them so heavily, and how to evaluate whether a product using one is worth your money.
What Is a Proprietary Blend?
A proprietary blend is a combination of ingredients listed on a supplement label with only the total combined weight disclosed. Individual ingredient amounts are hidden. Here is what it looks like in practice:
Transparent Label:
- Green Tea Extract (EGCG) — 500mg
- Berberine HCl — 1000mg
- Chromium Picolinate — 200mcg
Proprietary Blend Label:
- Metabolic Support Blend — 510mg: Green Tea Extract, Berberine HCl, Chromium Picolinate
In the first example, you know exactly how much of each ingredient you are consuming. You can compare those amounts to published clinical research and determine whether the doses are effective.
In the second example, you know the total blend weighs 510mg. You know the ingredients are listed in descending order by weight (FDA requires this). But you have no idea whether the blend contains 400mg of green tea extract and 100mg of berberine, or 250mg of each with 10mg of chromium. The difference matters enormously, because clinical effectiveness depends on specific dose thresholds.
Why Companies Use Proprietary Blends
The supplement industry offers two justifications for proprietary blends. One is legitimate in theory. The other is the real reason most companies use them.
The Official Reason: Protecting Trade Secrets
Companies claim that disclosing exact ingredient amounts would allow competitors to copy their formulas. This is the same logic that keeps the Coca-Cola recipe in a vault.
There is a kernel of truth here — in theory, a genuinely innovative formula could be replicated if every detail were public. In practice, this argument falls apart for supplements. Most supplement “proprietary blends” contain the same well-known ingredients available from the same handful of raw material suppliers. There is nothing secret about combining green tea extract, caffeine, and cayenne pepper. Everyone in the industry knows these ingredients and can source them from the same distributors.
The “trade secret” defense is especially weak when a product contains commodity ingredients like vitamin B6, chromium picolinate, or common herbal extracts. These are not novel compounds. There is nothing to protect.
The Real Reason: Hiding Underdosing
The far more common motivation for proprietary blends is cost reduction. Clinical research establishes effective doses for supplement ingredients — and effective doses are often expensive to include.
Consider berberine. Clinical trials demonstrating metabolic benefits use 900-1500mg per day. Berberine raw material costs roughly $15-25 per kilogram at wholesale. For a 30-day supply at 1000mg/day, that is $0.45-0.75 in raw ingredient cost per bottle — just for one ingredient.
Now consider a proprietary blend that lists berberine alongside five other ingredients in a total blend weighing 510mg. The entire blend weighs less than a single clinical dose of berberine alone. Simple math tells you the berberine is dramatically underdosed. But because the label only shows the total blend weight, most consumers never do this calculation.
This is not a fringe issue. It is the dominant business model in the supplement industry, particularly for products sold through affiliate marketing channels. A product with a 510mg proprietary blend containing six ingredients — like CitrusBurn, which packs 10 ingredients into a 510mg blend — might cost $3-5 per bottle to manufacture while selling for $49-79 per bottle. Transparent dosing at clinical levels would increase raw ingredient costs significantly, cutting into the margins that fund aggressive marketing.
How to Evaluate a Proprietary Blend
Not every proprietary blend is automatically worthless. Here is a framework for evaluating them.
Step 1: Check the Total Blend Weight Against Key Ingredients
Look up the clinical doses for the ingredients listed. If the total blend weighs less than the clinical dose of even one key ingredient, the formula is mathematically underdosed.
For example, GlucoTrust contains a proprietary blend totaling 82.5mg with ingredients like gymnema sylvestre (clinically studied at 200-400mg), cinnamon (studied at 1-6 grams), and chromium (studied at 200-1000mcg). The entire blend weighs less than half of the minimum clinical dose for gymnema alone. Every ingredient in that blend is almost certainly present at sub-therapeutic levels.
Step 2: Count the Ingredients
The more ingredients packed into a proprietary blend, the worse the problem becomes. A 500mg blend with two ingredients might contain meaningful amounts of both. A 500mg blend with twelve ingredients cannot possibly deliver clinical doses of any of them.
Products like CitrusBurn list multiple active ingredients in their blend. While some of those individual ingredients have genuine research support, the blend format makes it impossible to verify that any of them are present at levels that would produce the studied effects.
Step 3: Look for “Fairy Dusting”
“Fairy dusting” or “pixie dusting” is an industry term for including a tiny amount of an expensive or trendy ingredient just to put it on the label. A blend might advertise “Contains CoQ10!” while including 2mg in a blend where the clinical dose is 100-200mg.
Watch for expensive or headline-grabbing ingredients listed last in a proprietary blend. Since ingredients must be listed in descending order by weight, the last items in the list are present in the smallest amounts — often trace quantities added purely for marketing purposes.
Step 4: Compare to Transparent Alternatives
For any category of supplement, transparent alternatives almost always exist. If you are considering a proprietary-blend fat burner, you can buy standalone berberine, standalone green tea extract, and standalone chromium picolinate — all with exact doses printed on the label — for less money than most proprietary blend products charge.
The fact that transparent options exist and cost less should tell you something about what proprietary blends are really protecting.
The Dose-Response Relationship: Why Amounts Matter
The entire field of pharmacology rests on a simple principle: the dose makes the effect. This applies to supplements exactly as it applies to medications.
When researchers conduct clinical trials on supplement ingredients, they use specific amounts. Those amounts are chosen based on preliminary research suggesting a threshold where the ingredient produces a measurable biological effect. Below that threshold, nothing happens. At the threshold, you get the studied benefit. Above it, you might get additional benefit or you might get side effects.
When a supplement uses a proprietary blend, it removes your ability to know where you stand on this dose-response curve. You could be taking an effective dose. You could be taking a tenth of an effective dose. You have no way to know — and neither does your healthcare provider.
This matters especially for ingredients with known pharmacological activity. Berberine interacts with diabetes medications. High-dose green tea extract can affect liver enzymes. Certain herbal extracts can interact with blood thinners. Without knowing the actual dose, these interactions become unpredictable.
When Proprietary Blends Are Acceptable
There are narrow circumstances where a proprietary blend is less concerning:
When the total blend weight is very high relative to the number of ingredients. A 3,000mg blend with three ingredients has enough total material that each component could plausibly be present at a meaningful dose.
When the ingredients are all low-dose compounds. Some ingredients (certain trace minerals, adaptogenic herbs) are effective at doses of 5-50mg. A blend of these low-dose ingredients raises fewer underdosing concerns.
When the company provides third-party testing results. Some manufacturers voluntarily disclose ingredient amounts through third-party certificates of analysis, even when the label shows a proprietary blend. This is rare, but it demonstrates transparency.
When the brand has a strong track record. Established brands with decades of reputation may use proprietary blends for legitimate competitive reasons while still formulating at effective doses. This is the exception rather than the rule, but it exists.
The Regulatory Gap
You might wonder why the FDA allows proprietary blends at all. The answer lies in the Dietary Supplement Health and Education Act of 1994 (DSHEA), which established the regulatory framework for supplements in the United States.
Under DSHEA, supplement manufacturers are required to list all ingredients on the label. They are required to list ingredients in proprietary blends in descending order by weight. But they are not required to disclose individual amounts within a proprietary blend.
This regulatory gap exists because Congress accepted the “trade secret” argument during DSHEA’s passage. The result is a system where companies can legally sell products with undisclosed — and potentially ineffective — ingredient amounts, while consumers have no meaningful way to evaluate what they are paying for.
The FDA can take action against supplements that are adulterated (contaminated with harmful substances) or misbranded (making false claims). But selling a proprietary blend with sub-clinical doses of otherwise safe ingredients is perfectly legal.
The Bottom Line
Proprietary blends are a labeling strategy that overwhelmingly benefits manufacturers at the expense of consumers. While the “trade secret” justification sounds reasonable, the reality is that most proprietary blends exist to hide ingredient amounts that would not withstand comparison to published clinical research.
If a company has invested in clinical doses of quality ingredients, disclosing those amounts is a selling point, not a vulnerability. The brands that hide their formulations are far more often hiding cost-cutting than innovation.
When evaluating any supplement, transparent labeling with individually disclosed ingredient amounts should be a baseline requirement — not a bonus feature. For guidance on reading labels effectively, see our guide on how to read supplement labels. And if a product combines proprietary blends with other suspicious marketing tactics, review our supplement scam warning signs checklist before purchasing.
Frequently Asked Questions
Are all proprietary blends bad?
Not necessarily, but the majority are used to hide underdosed formulas rather than to protect genuine innovation. The key evaluation is whether the total blend weight is sufficient to contain clinical doses of the listed ingredients. If a blend weighs 500mg and contains ingredients that individually require 500mg or more to work, the math does not add up regardless of the company’s stated reason for using a proprietary blend.
Can I contact the company to ask for individual ingredient amounts?
You can, and some companies will provide this information upon request. However, companies that voluntarily disclose amounts to individual customers but refuse to print them on the label are likely engaging in selective transparency — providing information to motivated consumers while keeping the majority of buyers uninformed. A truly confident company puts the doses on the label for everyone to see.
Why do some reputable brands still use proprietary blends?
A small number of established brands use proprietary blends for formulas that genuinely represent years of research and development. In these cases, the blend is typically high in total weight relative to the number of ingredients, and the company often provides supporting documentation through third-party testing or clinical trials on their specific formula. These cases exist but represent a small fraction of the proprietary blend market.
Related Reading
- How to Read Supplement Labels: A Complete Guide — Learn to decode every section of a supplement label
- 10 Supplement Red Flags: How to Spot a Scam — Proprietary blends are red flag #1 on our list
- Is That Supplement a Scam? 15 Warning Signs — Comprehensive scam identification checklist
- Do Weight Loss Supplements Actually Work? — Why dosing matters for weight loss ingredients
- Natural vs Synthetic Supplements — When ingredient form on the label actually matters
See Proprietary Blends in Our Reviews
We analyze proprietary blends in detail in these product reviews:
- GlucoTrust Review — 82.5mg proprietary blend with ingredients needing 200-1000mg each
- CitrusBurn Review — 510mg blend hiding 10 ingredients at unknown doses
- Java Burn Review — Undisclosed dosages in a coffee supplement format
- LeanBiome Review — Better transparency than most, but CFU counts still unclear
- Ikaria Lean Belly Juice Review — Ceramic-based marketing narrative with hidden dosages
This guide is for educational purposes only and does not constitute medical advice. Always consult a qualified healthcare provider before starting any supplement.