Resveratrol Explained: Grapes, Japanese Knotweed and the "Trans" Form

By the Zespo team · Updated 26 October 2026

Resveratrol is a natural plant compound, a polyphenol, that some plants produce in response to stress such as fungal attack or strong sunlight. It is best known from the skins of red grapes.

Where does supplement resveratrol come from?

Grapes, berries and peanuts contain only small amounts. Most supplement resveratrol is extracted from the roots of Japanese knotweed (Polygonum cuspidatum), a fast-growing plant that is a far richer source.

What does "trans" mean?

Resveratrol exists in two mirror-like shapes, trans and cis. Trans-resveratrol is the more stable form and the one most labels specify, often with a purity such as 98%. A label that just says "resveratrol" or "knotweed extract" may contain less.

What to check before you buy

• The amount of each ingredient per serving, not just per capsule
• How many capsules make one serving and how many servings are in the pack
• Whether any ingredient sits inside an undisclosed "proprietary blend"
• An FSSAI licence number and the veg/non-veg mark on the pack

Also available: Zespo Resveratrol Complex 455 mg.

Label facts: Zespo Trans-Resveratrol 500 mg - 90 Veg Capsules

• Trans isomer - the active form, stated on the pack
• 500 mg in a single daily capsule
• Single ingredient, no proprietary blend, full amount disclosed
• Made in India in a GMP-certified facility, FSSAI-licensed

See Zespo Trans-Resveratrol 500 mg - 90 Veg Capsules on zespo.in · Also on Amazon.in (search "Zespo").

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Zespo products are food supplements, not medicines. This article is for general information and is not medical advice. Take supplements as directed on the label and speak to a qualified healthcare professional if you are pregnant, nursing, taking medication or have a medical condition.