When to take it
Just before a starch-rich meal (bread, pasta, rice).
← All supplements
OtherWeak evidence
White kidney bean extract
Also known as: Phaseolus vulgaris, starch blocker, alpha-amylase inhibitor
White kidney bean extract contains compounds that partly inhibit alpha-amylase, the enzyme that breaks down starch. Some starch from a meal may therefore go undigested, which is why it is sold as a "carb blocker".
What it is used for
- Modest weight loss – weak evidence, the effect is small
- Lower blood glucose rise after a starchy meal – weak evidence
Forms and how they differ
standardised extract
check the amylase-inhibiting activity if stated
combined fat burners
often with chromium or glucomannan, quality depends on the label
Pairs well with
A diet with fewer processed carbohydrates, enough protein and fibre.
Do not combine / separate
Pointless with meals without starch; be careful with diabetes medicines.
Watch out for
It may cause bloating and gas. In pregnancy, while breastfeeding, with diabetes, kidney or liver disease and when taking medicines, consult your doctor.
Safety
Do not exceed the label dose.
Practical tip
Rather than blocking starch, it works better to reduce the portion and add vegetables and protein.
Products containing White kidney bean extract 1
White kidney bean extract Phaseolus vulgarisPhaseolus vulgaris
How to read the evidence rating
Strong evidenceModerate evidenceWeak evidenceNo evidence
Strong = several good human studies or official recommendations; moderate = promising but smaller studies; weak = few studies or mixed results; no evidence = claims not confirmed.
Combination check
Select the supplements you take and, if relevant, your medicines. We show what interferes, what needs a time gap and what to watch out for.
Check White kidney bean extract with othersWhich supplements do you actually need?
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From the same group
AlfalfaNo evidenceAndrographisWeak evidenceAroniaWeak evidenceBarley grassWeak evidenceBee pollenWeak evidenceBeef organs (desiccated)Weak evidence
Important notice
This information is educational and does not replace advice from a doctor or pharmacist. We do not give medicine dosages. Supplements are no substitute for a varied diet; if pregnant, breastfeeding, ill or on medication, consult a doctor first.