Resveratrol products compared
| Product | Source | Daily dose | Resveratrol extract | Pack lasts |
|---|---|---|---|---|
| Swanson Resveratrol 50 mg, 30 capsules | Polygonum cuspidatum root | 1 capsule | 50 mg | 30 days |
| Swanson Resveratrol 100 mg, 30 capsules | Polygonum cuspidatum root | 1 capsule | 100 mg | 30 days |
The products differ in dose and in capsule filler, not in source. Pick the dose first, then compare the price per day, which already reflects the 30-day pack.
Reading the label
The label states the weight of the resveratrol extract, not necessarily the weight of pure trans-resveratrol inside it. If you compare with a product from another brand, check whether the figure refers to the extract or to the active compound.
- Source: the plant named on the label, here knotweed root.
- Amount per daily dose, which is one capsule for both products.
- Capsule material: gelatin, with rice flour or microcrystalline cellulose as filler.
Where resveratrol comes from
Resveratrol is a plant compound found in grape skins, some berries and peanuts, and in the root of Japanese knotweed, which is the usual raw material for supplements. The amounts in food are small compared with a capsule, so a supplement is a different thing from a portion of grapes.
Health claims and EU rules
The EU register of authorised health claims has no statement for resveratrol, so we do not describe effects on the heart, ageing, skin or anything else. Resveratrol also falls under the EU novel food rules, which set conditions for use in supplements. We show the dose exactly as the manufacturer prints it so that you can see what you take.
Before you buy
Swanson advises against use during pregnancy and breastfeeding, and recommends talking to a doctor first if you take prescription medicines. The 100 mg label also says adults only. Do not exceed the daily dose. For other antioxidant-type products compare the coenzyme Q10 and omega-3 categories, or the wider vitamins range.
Choosing a dose
Do not take more than the label says. A lower dose leaves room if you already take other plant-based products, and a higher one means fewer capsules to buy over time. Because both packs hold 30 capsules, the price per day is simply the pack price divided by 30, which makes the two doses easy to compare.
Questions
Which dose should I choose, 50 or 100 mg?
Both are one capsule a day. Start from the dose you actually want to take, then compare the price per day.
Is resveratrol the same as red wine?
No. Wine contains a small amount of resveratrol together with alcohol and many other compounds. A capsule contains a measured extract and no alcohol.
Can I take resveratrol with medicines?
Swanson recommends consulting a doctor if you take prescription medicines. Ask a doctor or pharmacist before you start.
How long does a pack last?
At one capsule a day, 30 capsules last 30 days.
Sources
- Regulation (EC) No 1924/2006 (nutrition and health claims)
- Regulation (EU) No 432/2012 (permitted health claims)
- Regulation (EU) 2015/2283 (novel foods)
- Implementing Regulation (EU) 2017/2470 (Union list of novel foods)
- EFSA: Health claims
Content reviewed by Inese Kalniņa, dietitian.
2026-10-08