Tree of heaven.
It is an intensely bitter tree bark. That bitterness triggers the reflex that gets gastric juices moving, which is the traditional reason bitter barks are taken before a meal.
- Category
- Herb
What Tree of heaven is, and what it does.
- Does it work
- Suits people who use traditional bitters before a heavy meal and keep the amount small. Anyone wanting human trial data will find the record is mostly laboratory work.
- How much to take
- No daily amount is on record for this bark, and its cytotoxic quassinoids are why traditional use keeps the amount very small. Start from what the preparation's label states.
- Time to feel it
- The bitter reflex is quick, within minutes of the taste hitting your tongue. Anything beyond that reflex hasn't been timed in people.
- The first dose
- Day one is mostly a taste event: sharp, lingering bitterness, then the sense that your stomach has woken up ahead of a meal.
- With regular use
- Weeks of daily use haven't been studied in people. The tannin fraction binds minerals and protein in the gut, so spacing it away from iron and protein matters over time.
- How well tolerated
- Keep the amount small: the quassinoids are cytotoxic at concentration and fresh sap irritates skin. Not for use in pregnancy, and check with a clinician before starting.
- How it feels
- Overwhelmingly bitter, detectable at tiny amounts. Most people notice a warm, stirred-up feeling in the stomach and little else.
- The overlooked benefit
- The label has to say root bark or stem bark. They are not the same material, and that one word tells you more about what is in the bottle than the tree's name does.
The proof, claim by claim.
These words describe the research, not the molecule's worth. Research strength is how much work stands behind one claim, and it is never a product score.
- stimulation of gastric secretion by intensely bitter principlesNarrative review
- antimicrobial and antiprotozoal activity of the alkaloid fractionIn vitro study
- antimitotic activity of ailanthoneIn vitro study
- skin irritation from handling fresh sap and leavesNarrative review
Why these belong in the same formula. Each row says what the basis is, from settled biochemistry through to a trial that measured the pair.
Ailanthone and related quassinoids are cytotoxic at higher concentrations and are metabolised in the liver. Traditional formulations pair such botanicals with hepatic-support herbs. There is no trial testing this combination and the rationale is entirely mechanistic.
Bark preparations from this tree carry substantial tannin, which forms insoluble complexes with non-haem iron and lowers absorption. Anyone correcting low iron status should keep the two several hours apart. This is the standard tannin effect and it applies regardless of any other property of the plant.
Condensed tannins bind divalent zinc in the gut, reducing the fraction available for uptake. Co-dosing a tannin-heavy bark extract with a zinc supplement wastes part of the zinc. Separation in time resolves it.
Condensed tannins precipitate proteins, including salivary and pancreatic enzymes, which is the mechanism behind their astringent mouthfeel. Taken in the same dose as a supplemental enzyme blend they reduce enzyme activity. The two should not share a capsule.
Tannins bind dietary and supplemental protein and form insoluble complexes, lowering the digestibility of both. A tannin-rich bark extract taken with a protein shake reduces the usable protein from that serving. This is a straightforward formulation incompatibility.
Both the plant's own flavonoids and supplemental quercetin are handled by the same gut-wall UGT and SULT enzymes. High combined doses compete for that capacity and shift the circulating free fraction. Pharmacokinetic overlap, nothing more.
Activated charcoal adsorbs most small organic molecules in the gut, including the alkaloids and quassinoids in this bark. Co-dosing removes the plant constituents from circulation before they are absorbed. Worth knowing as an incompatibility and as the reason charcoal is used after unintended ingestion.
Bark from this tree has a documented tendency to cause nausea and gastric upset at meaningful doses. A mucilaginous demulcent coats the mucosa and lessens that irritation. Traditional practice with a plausible physical basis and no trial evidence.
Nothing specific on file for Tree of heaven. Match the label to the daily amount above, and tell your doctor what you take.
Not medical advice. Show the label to your pharmacist.What Tree of heaven actually does.
Tree of heaven's defining compounds are intensely bitter, so bitter that they're detectable at tiny amounts, which is practically why it's hard to take in any quantity.
Ailanthone is cell-damaging and is what lets this tree suppress nearby plants by blocking root cell division, and that same cell-division-blocking action means it isn't a mild ingredient at concentrated doses.
The bark also carries a lot of tannin, which binds proteins to give an astringent mouthfeel, can reduce digestion of protein eaten alongside it, and can lower absorption of non-heme minerals in the gut.
Touching the fresh sap or leaves is a known cause of skin irritation, and occasionally a broader reaction, in people who handle the tree during removal, which is a separate concern from taking it orally.
Where Tree of heaven comes from.
It is the bark of a fast-growing tree originally from China that now grows wild almost everywhere. The bark is intensely bitter and contains compounds that are toxic to cells at higher concentrations, which is both why it has a traditional use and why the dose has always been kept small. Root bark and stem bark are not the same material, so the label needs to say which one is inside.
Made from a plant. What ends up in the capsule tracks the harvest, so batch testing and a stated marker matter more here than with a made molecule.
Native to China and northern Vietnam, now naturalised across Europe and North America as one of the most widespread invasive trees. Root bark and stem bark differ in constituent profile and are not interchangeable.
Bark is peeled and dried. The strong and persistent odour of fresh material largely dissipates. Quassinoids are reasonably stable through drying.
Water favours tannins, ethanol-water carries both quassinoids and alkaloids. Solvent choice substantially changes the finished profile.
Coarse bark solids removed and solvent stripped under vacuum. Little further purification is standard at commercial scale.
Ailanthone is the logical marker but is not routinely assayed in trade material. Most supply is sold on botanical identity and plant part alone, so quassinoid content between batches is unknown.
Plant part must be declared, since root bark and stem bark are chemically distinct and are frequently conflated on labels.
The forms it comes in.
The essence, in one line each.
- The authors reviewed how wood-decaying fungi degrade timber and how that process can be directed toward producing insulating biomaterials.Narrative review. Charpentier-Alfaro C et al., 2023 (Materials). PMID 37176430 ↗
- The authors surveyed the food, feed and nutraceutical properties of coconut palm.Narrative review. Mat K et al., 2022 (Animals). PMID 36009697 ↗
- The authors described oviposition behaviour and distribution of two weevil species on their host tree.Animal study. Zhang GY et al., 2019 (Insects). PMID 31487840 ↗
These are the studies our verdict leans on, chosen from the 3 we read for Tree of heaven. The full linked list is below.
FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. This information is for educational purposes only and is not intended to diagnose, treat, cure, or prevent any disease. Consult your healthcare provider before starting any supplement regimen.