Phaseolamin: what the “20%” on white kidney bean means
White kidney bean extract is standardised as a percentage of phaseolamin. Ours is at 20% — here is what that means in milligrams.
August 31, 2026
On a label, white kidney bean extract carries its Latin name — Phaseolus vulgaris — with a phaseolamin percentage beside it. The percentage is the more important of the two numbers.
What part of the bean this is
Phaseolamin is a protein fraction isolated from white kidney beans. In the bean itself it is a small share of the mass — the rest is mostly starch, fibre and other proteins. Extraction concentrates that fraction, and the percentage says how far the concentration went.
The numbers
White kidney bean extracts are sold across a wide range of standardisation grades. Ours is declared at 20% phaseolamin.
SlimDay contains 115 mg of extract per recommended daily intake. At 20% that is 23 mg of phaseolamin. The same 115 mg at 2% would give 2.3 mg.
The weight printed on the label can be identical while the content differs tenfold.
What to look for on a label
- the Latin name Phaseolus vulgaris, and that the bean is the part used
- the weight of the extract in milligrams per recommended daily intake
- the percentage, and that it refers to phaseolamin specifically, not to “total protein”
If the percentage is missing, the weight alone does not let you compare two products.
What the percentage does not say
Standardisation describes composition. It is not a statement about effect and should not be read as one — food supplements do not treat or prevent disease, and they complement rather than replace a varied diet.
