What A Proprietary Blend Really Tells You

You get two facts and no more

A proprietary blend statement gives you exactly two things. The combined weight of everything in it, and the order the ingredients are printed in, which by law is heaviest first. That is the whole dataset.

Take a 500 mg blend with fourteen ingredients. Split evenly, that is about 36 mg each. It is not really split evenly, because the ordering proves it is not, but it gives you the right scale to hold in your head.

Put that next to the studies

Two things fall out of that table straight away. The botanicals are all well short of trial doses at any plausible split. The two micronutrients are the opposite: a blend can easily supply useful amounts of chromium and biotin, because those are needed in micrograms.

The generous version

Be as favourable as possible. Say the first ingredient takes half the blend. That is 250 mg, and the other thirteen share 250 mg between them, averaging under 20 mg each. Even then the leading ingredient is at roughly a quarter of the low end of its trial range.

Now be realistic. A company that put half the blend into one ingredient would usually rather say so, because it is a selling point. The silence is weak evidence that the split is flatter.

What this does not prove

It does not prove a blend does nothing. Combinations can behave differently from their parts, several of these compounds act in the gut where the amount reaching the blood matters less, and the micronutrients are properly dosed at this scale.

What it does settle is narrower and more useful: you cannot read a Berberine trial and expect the trial result from a blend capsule. Those are different claims about different amounts.

The question worth asking

Not does it work — nobody will answer that usefully. Ask instead how much of the leading ingredient is in a serving. A brand that tells you is telling you something. A brand that will not is telling you something as well.