Japanese knotweed naturally contains a high level of resveratrol. As a result, less plant material is needed to make a concentrated extract, which makes this plant a common source for supplements. Supplements often contain 500 mg of pure resveratrol extract per capsule.

• Source — often Polygonum cuspidatum (Japanese knotweed), a concentrated natural source.
• Form — usually a plant-based capsule with pure extract.
• Dose — check the amount of resveratrol per capsule on the label.

If you want to compare resveratrol products, look at:

• Source — Polygonum cuspidatum is common and concentrated.
• Dose — the amount of resveratrol per capsule.
• Purity — a pure extract from a transparent manufacturer.
• Capsule — plant-based for a vegan diet.
• Medication — consult a doctor if you take medicines.

Disclaimer: this article provides general, descriptive product information without health or medical claims. No health claims are authorised in the EU for the substances mentioned in this article, unless explicitly stated otherwise. If you have health complaints or take medication, always consult a doctor or other qualified healthcare professional.

A food supplement is not a substitute for a varied, balanced diet and a healthy lifestyle.