Supplement Scholar
Compound

Isoquercetin

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Isoquercetin. Highly bioavailable quercetin glycoside.

How it works. Better absorbed than aglycone quercetin.

What the research supports. 1 graded claims. Strongest: Reduces VTE in cancer (moderate).

How much to take. Typical dose: 500–1000 mg.

Side effects and interactions. 1 medication interaction listed. No serious side effects listed at normal doses.

Stacking. Pairs well with Vitamin D3 + K2, Zinc, Omega-3.

Common forms. Available as Capsule or softgel, Powder, Sublingual or buccal, Liposomal liquid.

Key studies. 8 studies cited. The strongest are listed with links to PubMed.

Community. Experiences from people who have tried Isoquercetin. Anecdotes are not medical advice.

Isoquercetin. Highly bioavailable quercetin glycoside.

Molecular structureC21H20O12 · 464.4 g/mol

What it is

Highly bioavailable quercetin glycoside.

Food sources

Endogenously produced or biosynthesized moleculeStandardized pharmaceutical- or food-grade supplementCombined with cofactors that improve absorption or activity

Goals

Immune FunctionCardiovascular Health

How it works

Better absorbed than aglycone quercetin.

Pathways

  • Better absorbed than aglycone quercetin

Effects

  • ↓VTE in cancer decreases

What the research supports

Reduces VTE in cancermoderate

Strong: consistent results across large trials or meta-analyses. Moderate: several trials, mostly positive. Limited: small or mixed studies. Preclinical: animal or cell research only.

Typical dose
500–1000 mg
TimingConsistent daily timing recommended; split larger doses if GI tolerance is a concern.
With foodWith a meal containing fat for fat-soluble compounds; otherwise either.
Best formMost evidence is based on the capsule or softgel form.
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Side effects & interactions

Common side effects

  • GI upset

Medication interactions

Prescription medications (general)minor

Always disclose Isoquercetin use to your prescriber — additive, antagonistic, or pharmacokinetic interactions are possible.

Check any supplement–medication combination with your pharmacist before starting.

Combines with

Pairs well

  • Vitamin D3 + K2Foundational immune modulation.
  • ZincRequired cofactor for innate and adaptive immune function.
  • Omega-3Anti-inflammatory cardiovascular synergy.

Common forms

  • Capsule or softgel
  • Powder
  • Sublingual or buccal
  • Liposomal liquid

Key studies

8 studies cited in total.

PubMed: Isoquercetin — Reduces VTE in cancer ↗
Systematic review · PubMed (NLM) · 2026

Opens current human and preclinical literature matching Isoquercetin and "Reduces VTE in cancer". Filter by RCT, meta-analysis, or year on the results page.

PubMed: Isoquercetin — randomized controlled trial ↗
Systematic review · PubMed (NLM) · 2026

Opens current human and preclinical literature matching Isoquercetin and "randomized controlled trial". Filter by RCT, meta-analysis, or year on the results page.

PubMed: Isoquercetin — meta-analysis ↗
Systematic review · PubMed (NLM) · 2026

Opens current human and preclinical literature matching Isoquercetin and "meta-analysis". Filter by RCT, meta-analysis, or year on the results page.

Discussion

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