Quercetin
A plant flavonoid, 250 mg in Ember. Pooled trials found a few points off blood pressure at 500 mg a day or more.
Written by R. Kessler · About Knurle · Editorial policy
The short answer
Quercetin is a flavonoid found in onions, apples and tea. A meta-analysis of seven trials in 587 people found it lowered systolic blood pressure by 3.04 mmHg and diastolic by 2.63. Looked at separately, trials at 500 mg a day or more showed an effect and those below it did not.
The form, and why it matters
Ember uses quercetin dihydrate extract from the flower buds of Sophora japonica, the Japanese pagoda tree, 250 mg in a two-capsule serving.
Typical dose
The trials that showed an effect on blood pressure used 500 mg a day or more. Ember carries 250 mg.
What the research shows
Across seven trials and 587 participants, systolic blood pressure fell by 3.04 mmHg and diastolic by 2.63. At 500 mg a day or more the falls were 4.45 and 2.98. Below 500 mg a day there was no significant effect, though the authors note the difference between the dose groups was not itself statistically proven.
Who should be careful
Quercetin can interact with some medicines, including blood thinners and some antibiotics. Talk to your clinician first if you take prescription medicine, are pregnant or nursing. Ember is not a treatment for blood pressure.
Where it sits in our formulas
| Product | Form on the label | Amount per serving | % Daily Value |
|---|---|---|---|
| Ember | Sophora japonica, whole flower bud | 250 mg | not established |
Sources
Figures checked against the sources above on 21 September 2026.
Resveratrol
From Japanese knotweed root, 150 mg of 98% extract in Ember. Small trials on memory and blood vessel function.
Read itNAD+
Nicotinamide adenine dinucleotide, 500 mg in Ember. The human research so far is mostly on its building blocks rather than on NAD+ taken by mouth.
Read itEvery milligram, printed.
Each amount on the label is the amount in a full daily serving, and it matches what is on this page.
