What Is a Proprietary Blend?
A proprietary blend is a mixture of ingredients listed on a supplement label with only the total weight of the blend disclosed, not the individual amount of each ingredient. The FDA requires that ingredients within a blend be listed in descending order by weight, but the specific milligram amount of each component can be hidden behind the "proprietary" designation.
For example, a label might read:
Cognitive Performance Blend — 500 mg
*Lion's Mane Extract, Alpha-GPC, Bacopa Monnieri, L-Theanine, Huperzine A*
In this example, you know the total blend weighs 500 mg and that Lion's Mane is the heaviest ingredient. But you have no idea whether it contains 400 mg of Lion's Mane and trace amounts of everything else, or a balanced distribution. This ambiguity is the core problem.
The Legal Framework
Under 21 CFR 101.36(c), the FDA permits proprietary blends as a way for manufacturers to protect "trade secrets" — their unique formulation ratios. The regulation was designed for genuinely innovative combinations where the ratio of ingredients constitutes intellectual property.
In practice, proprietary blends are overwhelmingly used not to protect innovation, but to obscure the use of sub-therapeutic ingredient doses. A 2015 analysis by the American Botanical Council found that the majority of proprietary blends in top-selling supplements contained at least one ingredient at doses below those used in published clinical research.
Why Proprietary Blends Are Problematic
1. You Cannot Verify Effective Dosing
Clinical research establishes effective doses for individual ingredients. For instance:
- Bacopa monnieri requires 300-600 mg/day of standardized extract for cognitive benefits
- Beta-alanine requires 3.2-6.4 g/day for performance benefits
- Ashwagandha (KSM-66) requires 300-600 mg/day for stress reduction
When these ingredients are buried in a proprietary blend totaling 500 mg or less, it is mathematically impossible for all of them to be present at effective doses.
2. Label Decoration (Fairy Dusting)
The supplement industry uses the term "fairy dusting" or "label decoration" to describe the practice of including popular, expensive ingredients at trace amounts purely for marketing appeal. A blend might list 15 trendy ingredients while containing therapeutic amounts of none of them.
3. Cost Reduction Through Substitution
Ingredients within a category can vary enormously in cost. For example:
- Alpha-GPC costs ~$40-60/kg wholesale
- Choline bitartrate costs ~$8-12/kg wholesale
Both are choline sources, but alpha-GPC has superior bioavailability and brain-specific evidence. A proprietary "choline blend" could be 95% choline bitartrate and 5% alpha-GPC while listing alpha-GPC first if measured by active choline content.
4. Safety Concerns
Without knowing individual doses, it is impossible to:
- Check for excessive intake of any single ingredient
- Cross-reference with medications for interaction risk
- Determine if a stimulant like caffeine or synephrine is present at dangerous levels
How to Spot a Proprietary Blend
Red flags on labels:
- The words "Proprietary Blend," "Complex," "Matrix," or "Blend" followed by a single total weight
- Individual ingredient amounts shown only with daggers (†) or asterisks meaning "Daily Value not established" with no mg amount
- Long ingredient lists within a single blend (5+ ingredients in one blend is concerning)
What transparent labels look like:
| Proprietary Label | Transparent Label |
|---|---|
| Energy Blend 400mg: Caffeine, L-Theanine, B12 | Caffeine Anhydrous 200mg |
| (no individual doses shown) | L-Theanine 200mg |
| Vitamin B12 (methylcobalamin) 1000mcg |
Comparing Proprietary vs Transparent Brands
The supplement market has shifted significantly toward transparency over the past decade. Brands like Transparent Labs (name says it all), Thorne, Momentous, and Life Extension fully disclose every ingredient dose. These companies have found that transparency is actually a competitive advantage, as informed consumers increasingly demand it.
A 2020 survey published in the Journal of the International Society of Sports Nutrition found that 73% of supplement consumers considered full ingredient disclosure "very important" in their purchasing decisions, up from 41% in 2010.
The Third-Party Testing Connection
Proprietary blends are also harder for third-party testing organizations (USP, NSF, ConsumerLab) to evaluate. When exact amounts aren't declared, testers can only verify total blend weight — not whether individual components meet therapeutic thresholds. Fully disclosed supplements allow for complete verification of label accuracy.
When Are Proprietary Blends Acceptable?
In rare cases, a proprietary blend may be reasonable:
- Traditional herbal formulas with long histories of use at specific ratios (e.g., certain Ayurvedic or TCM combinations)
- Patented, researched combinations where the specific blend has been tested as a unit in clinical trials (the blend itself is the studied intervention)
- Flavor or absorption-enhancing blends where the active ingredients are separately disclosed and only minor support ingredients are blended
Even in these cases, the active ingredients' doses should ideally be disclosed separately.
How to Protect Yourself
1. Choose transparent labels — if a company won't tell you what's in their product, they probably don't want you to know
2. Do the math — if a blend contains 5 ingredients in 500mg total, no single ingredient can exceed 500mg, and most will be far less
3. Check research doses — look up the clinically studied dose for each ingredient and compare it to what's mathematically possible given the blend weight
4. Prefer third-party tested products — USP, NSF, or ConsumerLab certification provides an additional layer of verification
5. Beware of "kitchen sink" formulas — products with 20+ ingredients in a single blend are almost certainly underdosed across the board