Cross-referencing clinical data
A pairing appears on this page only when a trial gave both ingredients together and measured the result. Houttuynia has none that clears that bar.
Stitching two separate single-ingredient studies into a pairing is the one thing this engine will not do. When a study of the combination itself holds up at source, it lands here with its citation.
No invented synergy. Where actives were studied on their own rather than together, the record shows each on its own evidence, never a combined effect no trial measured.
Research strength. Research strength says how much work stands behind the combination. It is never a product score.
Independent record. Every finding is cited to a named trial, dated, and never written by the brand.
20 pairings are live across the library today. Checked 20 July 2026.
No study gave these as a pair, so they are not in the card above. But the reason they belong together is settled biochemistry, not a guess, so it is worth knowing.
Quercitrin and isoquercitrin dominate this plant's flavonoid fraction. Gut bacteria cleave off the sugar, and only then is quercetin absorbed and conjugated. Supplementing quercetin alongside means two sources arriving on the same conjugation pathway. That is a shared clearance load rather than a straightforwardly larger effect.
Rutin is quercetin-3-rutinoside and this plant's quercitrin is the rhamnoside. Both queue for the same bacterial glycosidases and the same downstream conjugation enzymes. At high combined intake the conversion step limits throughput, so doubling the glycoside does not double circulating quercetin. This is standard flavonoid pharmacokinetics.
The regeneration of a phenoxyl radical by ascorbate is well characterised in vitro and is why the two are so often formulated together. In a finished product it also helps hold the flavonoid assay through shelf life. Whether it changes anything measurable after swallowing is a separate and unanswered question. State it as chemistry.
The rationale is that a polysaccharide fraction and a volatile oil fraction act through different routes on overlapping endpoints. The work behind the pairing is veterinary and animal-based, so it shows the combination exists and has been evaluated, not that it does anything in people. Human dosing is undefined. Read it as mechanistic.
Decanoyl acetaldehyde disrupts bacterial membranes in vitro across a wide range of species. Whether enough survives an oral dose to reach the colon at an active concentration is unknown. Separating the two by a few hours removes the uncertainty at no cost. Naming the concern is more useful than assuming it away.
Dokudami's traditional East Asian reputation is as a urinary herb. Any genuine increase in output carries electrolyte losses with it, potassium among them. The magnitude at supplement doses has not been measured in people. Anyone on a diuretic or a potassium-affecting medicine should raise it with a prescriber.
Carvacrol and decanoyl acetaldehyde both show membrane-level antimicrobial activity in laboratory assays. Combining two volatile oils raises the total irritant load on the gut lining, which is usually the practical dose limit. Enteric coating exists for exactly this reason. There is no human data on the pair.
Nothing specific on file for Houttuynia. Match the label to the daily amount above, and tell your doctor what you take.
Not medical advice. Show the label to your pharmacist.1 source behind our Houttuynia verdict: peer-reviewed studies and registered clinical trials. Every one links straight to PubMed, the journal, or ClinicalTrials.gov. Read them yourself.
Evidence surfaced via Semantic Scholar (Allen Institute for AI) and ClinicalTrials.gov. Ranked by study type and citation weight, not cherry-picked.
Read this carefully. These are 372 voluntary, unverified reactions reported to the FDA (openFDA). The number mostly reflects how popular Houttuynia is, not how risky it is. A report is not proof Houttuynia caused anything. It is a signal of what to watch for, nothing more.
Source: openFDA adverse-event reports. Voluntary reporting, not an incidence rate.
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.