Proprietary Blends Explained: Why Manufacturers Hide Milligrams
Published: 2026-05-20 · Verified by the Melonex Clinical Desk
Key Article Takeaways
- Proprietary blends legally allow manufacturers to withhold individual ingredient weights under 21 CFR 101.36.
- Originally conceived to protect trade secrets, they are frequently used to mask underdosed expensive ingredients.
- Ingredients within a blend must be listed in descending order of predominance by physical weight.
- Consumer advocates strongly encourage fully transparent labels disclosing exact milligram quantities.
Table of Contents
The Legal Origin of the Proprietary Blend
Under Section 403 of the Federal Food, Drug, and Cosmetic Act and codified in 21 CFR 101.36, the FDA established labeling rules for dietary supplements. Recognizing that companies invest research capital into creating unique synergistic formulas, the law permits brands to identify a group of ingredients under a collective 'proprietary blend' or 'complex' name.
The manufacturer must disclose the total combined metric weight of the blend, and must list each constituent ingredient in descending order of predominance by weight, but is exempt from printing the exact milligram amount of each separate component.
Trade Secret Protection vs Consumer Opacity
In legitimate contexts, proprietary blends prevent competitor brands from copying an innovative ratio. However, in low-integrity commercial environments, proprietary blends are used to obscure 'economic adulteration.'
For instance, if a 500 mg blend contains L-Citrulline, L-Arginine, and an expensive botanical extract, the manufacturer could theoretically include 498 mg of cheap arginine and only 1 mg of the other two ingredients. While they are legally listed in order of predominance, the consumer cannot discern whether the formula delivers meaningful amounts of all actives.
How to Read Between the Lines on a Proprietary Label
When evaluating a formula with a proprietary blend like Melonex:
• Check the Total Weight: Melonex provides 500 mg per capsule. With only three active amino acids in the matrix, each compound represents a substantial percentage of the capsule, avoiding the extreme dilution seen in 20-ingredient blends.
• Check the Order: L-Citrulline DL-Malate is listed as the primary active, ensuring it forms the foundational baseline of the matrix.
• Recognize the Tradeoff: Acknowledge that while the formula provides credible nitric oxide precursors, total transparency would require publishing exact individual milligram amounts.
Official Reference Store Notice
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