What kind of interaction is it?

Caution: an interaction that may reduce efficacy or raise side-effect risk and warrants monitoring.

Is this interaction backed by published research?

Yes. NutriStack lists 1 citation row for the Niacin (Prescription) + Quercetin pair, each linking to PubMed by PMID where available. Full sourcing methodology at https://nutristackapp.com/methodology/interactions.

Supplement × Prescription·a caution·Insufficient evidence

Niacin (Prescription) + Quercetin

Q: Can I take Niacin (Prescription) and Quercetin together?

Possibly, but with caution. Niacin (Prescription) and Quercetin have a documented caution-tier interaction. Prescription niacin causes prostaglandin-mediated cutaneous flushing (warmth, redness, itching), the most common reason for discontinuation. Quercetin has been studied as an anti-inflammatory and mast-cell-stabilizing flavonoid. Combining them is generally low risk, but quercetin is not an established treatment for niacin flushing and should not replace proven measures such as aspirin pretreatment or slow titration.

Q: How does this affect a NutriStack Stack Score?

-5 to your Stack Score per scored caution row.

Caution Insufficient evidence

Prescription niacin causes prostaglandin-mediated cutaneous flushing (warmth, redness, itching), the most common reason for discontinuation. Quercetin has been studied as an anti-inflammatory and mast-cell-stabilizing flavonoid. Combining them is generally low risk, but quercetin is not an established treatment for niacin flushing and should not replace proven measures such as aspirin pretreatment or slow titration.

Supplement × Prescription

Open the interaction checker → Read the methodology

From the database

What the row says.

Every entry follows the same shape: what is happening, the mechanism, and the recommendation.

Substances

Niacin (Prescription) and Quercetin

Pair type

Caution

Evidence

Insufficient

Source citations

Scope

Supplement × Prescription

Last verified

June 4, 2026

CautionInsufficient evidence

What is happening. Prescription niacin causes prostaglandin-mediated cutaneous flushing (warmth, redness, itching), the most common reason for discontinuation. Quercetin has been studied as an anti-inflammatory and mast-cell-stabilizing flavonoid. Combining them is generally low risk, but quercetin is not an established treatment for niacin flushing and should not replace proven measures such as aspirin pretreatment or slow titration.

Mechanism. Niacin flushing is driven by GPR109A-mediated release of prostaglandin D2 from skin Langerhans cells and keratinocytes. Quercetin's antioxidant and mast-cell-stabilizing actions do not target this prostaglandin pathway in a clinically proven way.

Recommendation. Manage niacin flushing with evidence-based strategies (low-dose aspirin 30 minutes before dosing, taking with food, avoiding hot beverages and alcohol near dosing, gradual dose escalation). Quercetin may be taken concurrently but should not be relied on for flush control.

Stack Score

How it moves the number.

Effect on the composite score

If both Niacin (Prescription) and Quercetin are in the same stack, this pair applies −5 to your Stack Score (per scored caution row).

The full algorithm, the clamping rules, and four worked stacks are at /methodology/stack-score.

Sources

Sources, by evidence tier.

Every claim on this page is cited. PMIDs link straight to PubMed.

Reference material

1Benyo Z, Gille A, Kero J, et al. GPR109A (PUMA-G/HM74A) mediates nicotinic acid-induced flushing. Journal of Clinical Investigation. 2005.Needs sourceNo link

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