Resveratrol Supplements UK 2026: Buying Guide

How to choose a resveratrol or pterostilbene product with realistic expectations.

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TL;DR: Resveratrol has mixed human trial results. Pterostilbene is better absorbed but has fewer trials. Look for 'trans-resveratrol' on the label, not just 'resveratrol' or 'grape extract'. Study doses are typically 150–1,000 mg/day.

🐢 Tortoise Wisdom"Pterostilbene is resveratrol's better-absorbed cousin, but better absorbed does not mean proven."

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2. Trans-Resveratrol vs Total Resveratrol

Only trans-resveratrol is the active form. A label saying 'resveratrol 500 mg' may include cis-resveratrol and other isomers. 'Trans-resveratrol 500 mg' is the meaningful number.

3. Buying Checklist

  • Active form: look for 'trans-resveratrol'.
  • Purity: 98%+ trans-resveratrol is common.
  • Amount: match a studied dose if you can.
  • Pterostilbene alternative: better absorbed; 50–100 mg/day is typical.
  • Piperine / quercetin: sometimes added to improve bioavailability.

4. Safety

Resveratrol is generally safe but can interact with blood thinners, NSAIDs and some cancer drugs. High doses may cause GI upset.