Advertising Disclosure: This site contains affiliate links. We may earn a commission if you purchase through our links, at no extra cost to you. Learn more
"Proprietary blend" sounds like it's protecting valuable intellectual property. In the supplement industry, it's more often protecting the manufacturer from you noticing the doses don't match what the research actually used.
Under FDA labeling rules, a company can group several ingredients under a blend name and disclose only the combined total weight, not the amount of each individual ingredient. A "Metabolic Support Blend: 500mg" could legally be composed almost entirely of a cheap filler ingredient with only trace amounts of the ingredients doing the actual work — and there's no way to tell from the label.
Every article in this series — on Berberine's AMPK mechanism, Ashwagandha's cortisol research, Glucomannan's satiety science — depends on being able to compare a specific disclosed dose against the dose used in clinical research. A proprietary blend makes that comparison impossible. The ingredient could be present at a research-supported dose, or at a fraction of it, and a reader has no way to know which.
There's one legitimate justification for withholding an exact formula: protecting a genuinely novel, patentable combination from being copied. In practice, the overwhelming majority of "proprietary blends" in the women's metabolism category use common, widely available ingredients — Berberine, Green Tea Extract, Ashwagandha — with no real trade-secret value. The blend name in these cases is functioning as a marketing device, not intellectual property protection.
Look at the Supplement Facts panel specifically, not the marketing copy on the front of the package. If every ingredient has its own listed milligram amount, that's full disclosure. If ingredients are grouped under a blend name with only a combined total, that's a proprietary blend — and everything else on the label becomes harder to verify as a result.
No blend names, no hidden totals — check the full label yourself.
See the Full Label →Disclaimer: This article is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare provider before starting any new dietary supplement program.