Double Wood Berberine with Ceylon Cinnamon
Every number here is published: 500mg berberine and 200mg of a 10:1 Ceylon cinnamon extract per serving, 60 servings from 120 capsules, at $19.95. It also specifies Ceylon cinnamon rather than the cheaper Cassia, which is a genuine safety distinction that most cinnamon supplements quietly avoid making.
Last reviewed · researched from the manufacturer’s published pages by Tom
What’s in it
Amounts are shown only where the manufacturer publishes them. Anything without a figure is undisclosed — and for an active ingredient, an undisclosed dose is the central problem with this category.
- Berberine500 mg per serving
A standard research-level dose
- Ceylon cinnamon 10:1 extract200 mg per serving
Stated as equivalent to 2 grams of Ceylon cinnamon powder
How the manufacturer says it works
Double Wood states that Ceylon cinnamon and berberine taken together may support each other's effects, helping support metabolism and metabolic health. Manufactured in the USA from globally sourced ingredients; gluten-free, vegan-safe and non-GMO.
What the evidence actually supports
This is a fully specified product: both actives carry a published amount, the extract ratio is given, and the powder equivalent is stated so you can compare it against research. 500mg of berberine is a genuine research-level dose — most berberine trials use 500mg taken two or three times daily. The Ceylon choice deserves explicit credit: Cassia cinnamon, the cheap and common variety, contains coumarin, which is hepatotoxic in sustained quantities. Ceylon contains far less. A supplement that names the species is telling you something that matters, and most do not.
Where that evidence stops
Berberine acts on AMPK, not the GLP-1 receptor, so despite where these products get marketed this is not a GLP-1 mechanism. Cinnamon's evidence for glucose control is inconsistent, with meta-analyses reaching mixed conclusions, so treat it as the supporting ingredient it is. The important warning is the same as for all berberine: it inhibits CYP3A4 and can raise blood levels of many common prescription medications — statins, some blood pressure drugs, anticoagulants and others. That single fact matters more than any benefit claim on the page.
Strengths and problems
Strengths
- Every amount published: 500mg berberine, 200mg Ceylon cinnamon 10:1 extract, with the powder equivalent stated
- 500mg berberine is a genuine research-level dose, not a token amount in a blend
- Specifies CEYLON cinnamon rather than Cassia — a real safety distinction on coumarin content
- Publishes servings per container so the true cost per serving is calculable
- About 33¢ per serving makes it one of the cheapest properly-dosed berberine products here
- Gluten-free, vegan-safe, non-GMO
Problems
- Berberine inhibits CYP3A4 and can raise levels of many prescription drugs — the most important fact and not prominent here
- Cinnamon's glucose evidence is inconsistent across meta-analyses
- Not a GLP-1 mechanism despite the category it is sold into
- Berberine trials typically use 500mg two or three times daily; one serving is the low end
- No third-party testing statement, and warnings are not published
What the manufacturer publishes
Publishes 8 of 8 standard terms.
- Intended use
- Sold as a dietary supplement, not as a treatment for any condition.
- Directions
- Two capsules per serving as published; the page did not state timing in the description we captured. Berberine is usually taken with meals.
- Warnings
- Not published in the description we captured.
- Allergens
- States gluten-free, vegan-safe and non-GMO.
- Third-party testing
- Not stated in the description we captured. Double Wood publishes Supplement Facts panel images on its product pages.
- Pricing
- $19.95 for 120 capsules (60 servings) — about 33¢ per serving.
- Subscription
- Not stated in the description we captured.
- Refunds
- Not stated in the description we captured.
- Shipping
- Free shipping on orders over $30 across the Double Wood range.
May suit
Someone who wants berberine at a real dose, at a low price, from a company that publishes its numbers and names its cinnamon species.
Do not use if
- You take any prescription medication and have not checked interactions with a pharmacist
- You are pregnant or breastfeeding
- You take glucose-lowering medication — additive hypoglycaemia risk
- You have liver disease — discuss any cinnamon supplement with your doctor
Frequently asked
Does Ceylon versus Cassia actually matter?
Yes. Cassia is the cheap, widely sold variety and contains coumarin, which is hepatotoxic at sustained intakes. Ceylon contains far less. A supplement naming the species is giving you information most competitors omit, and the omission is rarely in your favour.
Is 500mg enough berberine?
It is a real dose — the trials typically use 500mg two or three times daily. One serving here sits at the low end of that range, so read the label against how you intend to take it.
Sources
Captured . Manufacturer pages change — check the current version before relying on anything.