Ingredient 5 of 8
Quercetin in Nervecept: 8 mg, What MSK Says and Which Drugs to Ask About
Quercetin, from the Sophora japonica bud, is the fifth line on the Nervecept panel at 8 mg a capsule, 1.1% of the 699 mg printed. It is a plant flavonoid sold as an antioxidant. MSK says it has not been shown to treat disease and that clinical evidence is unclear. MSK also lists interactions, including a warfarin user whose INR rose.
Written by the Nervecept label deskUpdated
The name on the bottle01
What is quercetin in Nervecept?
Quercetin is a plant flavonoid found in many foods. The label lists Quercetin (Sophora japonica)(bud), 8 mg.
Supplements often take it from the Sophora japonica bud, as here. It is sold as an antioxidant. The panel gives the amount of the bud material, not a stated strength of quercetin itself.
At 8 mg it is one of four lines at the same small amount. Small does not mean harmless, as the MSK page on interactions shows, and it does not mean useless. The point is that the sources we read give no reason to expect an effect from an amount like this.
| Name on the label | Quercetin (Sophora japonica)(bud) |
|---|---|
| What it is | A plant flavonoid, here from the Sophora japonica bud |
| Place on the panel | 5 of 8, in label order |
| Amount per capsule | 8 mg per capsule on the Supplement Facts panel (1.1% of the 699 mg printed) |
| Amount in sources | No dose source was fetched |
| Strength of evidence | MSK: has not been shown to treat disease; clinical evidence unclear |
| Marketed or traditional use | Sold as an antioxidant |
| Main caution | MSK: a warfarin user's INR rose after quercetin; possible interactions with losartan, tamoxifen and some chemotherapy. |
The amount02
How much quercetin is in a Nervecept capsule?
8 mg per capsule is 1.1% of the 699 mg printed, a small line next to 500 mg of glucosamine.
| Measure | Figure | Where it comes from |
|---|---|---|
| Quercetin in one capsule | 8 mg | Label panel |
| Share of the 699 mg printed | 1.1% | Our math: 8 divided by 699 |
| Same amount as | Methionine, MSM, bromelain | All three also print 8 mg |
| Studied dose | Not fetched | No dose source was read |
We did not fetch a dose source for quercetin, so we compare nothing with trial amounts. We say only what the label prints.
699 mgthe eight printed amounts added up; the panel prints no total
8 lines · 500 + 67 + 50 + 50 + 8 + 8 + 8 + 8 mg- Glucosamine Sulfate500 mg · 71.5%
- Indian Frankincense67 mg · 9.6%
- Chondroitin Sulfate50 mg · 7.2%
- Turmeric50 mg · 7.2%
- Quercetin8 mg · 1.1%
- Methionine8 mg · 1.1%
- Methylsulfonylmethane8 mg · 1.1%
- Bromelain8 mg · 1.1%
Bars show each printed amount as a share of the 699 mg we added up. It illustrates the numbers on the panel; it does not measure what any line does.
The research03
What do health sources say about quercetin?
The reading is plain. There is little proof of benefit and a list of medicine interactions worth asking a pharmacist about.
MSK
Quercetin "has not been shown to treat cancer or other diseases", and clinical evidence is unclear 1.
Interactions
Possible interactions with CYP3A4 and CYP2C19 drugs; clinical relevance is not known 1.
Case report
A warfarin user developed an elevated INR after taking quercetin, which normalized after stopping 1.
None of these pages tested Nervecept. The capsule has never been studied as a product, so no one can say how this line behaves inside it.
In the formula04
How does the quercetin line fit the rest of the Nervecept formula?
It is line 5 of 8 on the panel. It opens the foot of the panel with 8 mg, level with methionine, MSM and bromelain, so it is a small part of what you swallow.
Eight ingredients in one capsule means eight sets of cautions in one swallow. If any one of them is a problem for you, the capsule is a problem for you, however small that line is. That is the practical reason to read all eight pages before you order, and to show the whole panel to a pharmacist.
The label sets the amounts, and the order on the panel follows weight. The first four lines make up 95.6% of the 699 mg we print. The last four share 4.4%. That does not tell you which line matters most for any effect, because no study of the capsule exists. See how Nervecept works for the whole picture.
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See packsNerves05
Is quercetin studied for numbness or tingling?
Not in any source we read. We make no claim that it helps nerve symptoms.
We found no source that studies quercetin for numbness, tingling or nerve pain. MSK's summary is that it has not been shown to treat diseases 1. If you have nerve symptoms, see a clinician about the cause 2.
Numbness, tingling or pain in the hands or feet deserves a medical visit 2. Keep taking prescribed medicine. Sudden weakness or numbness on one side, a drooping face or trouble speaking means call 911 3. See when to see a doctor for numbness.
Cautions06
Who should be careful with quercetin?
Anyone on medicines, with a medical condition, pregnant or nursing, or planning surgery should ask a clinician first.
- Warfarin: a user's INR rose after quercetin and normalized when it was stopped 1.
- Losartan and tamoxifen: levels may change 1.
- Chemotherapy: MSK says it may interfere with certain chemotherapy drugs 1.
- Other medicines: possible interactions with CYP3A4 and CYP2C19 drugs; ask a pharmacist 1.
- If you are in cancer care, ask your oncology team before any supplement 4.
The whole formula is covered on the side effects page and in supplements and blood thinners.
Before you order07
What is the honest summary of the quercetin line?
The reading is plain. There is little proof of benefit and a list of medicine interactions worth asking a pharmacist about. This line is 8 mg of a 699 mg capsule, and no study tested the capsule.
In its favor
- Printed amount, 8 mg
- A common plant compound
- MSK lists the interactions clearly
Against it
- Not shown to treat disease 1
- Several drug interactions to check
- No source linked here tests it for nerves
Compare it with the other seven lines on the ingredients page, and see the whole panel on the supplement facts page.
FAQ08
Questions about quercetin in Nervecept
What is quercetin?
A plant flavonoid found in many foods, sold as an antioxidant.
How much quercetin is in Nervecept?
8 mg per capsule of the Sophora japonica bud, 1.1% of the 699 mg printed by our sum.
Does quercetin work for anything?
MSK says it has not been shown to treat cancer or other diseases and that clinical evidence is unclear 1.
Can quercetin help numbness or tingling?
We found no source that says so.
Does quercetin affect warfarin?
MSK reports a warfarin user whose INR rose after quercetin 1. Ask your doctor.
Is it safe during chemotherapy?
MSK says it may interfere with certain chemotherapy drugs 1. Ask your oncology team.
Who wrote this09
Written and reviewed by
Pages built from the label, the sales page and linked NIH, FDA, CDC, FTC and peer-reviewed sources.
Last updated . Read our editorial standards and how we check reviews. This website is the information site for a USA Authorized Nervecept Retailer. It is not the manufacturer or the distributor named on the label. We earn money when you buy through our order links.
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