Quercetin Phytosome: Bioavailable Quercetin for Anti-Inflammation & Cardiovascular Support
⚡ 60-Second Summary
Quercetin phytosome refers to any quercetin-phosphatidylcholine (PC) complex that uses phytosome technology to improve quercetin bioavailability. Quercefit (Indena SpA) is the most studied branded form, but other manufacturers also produce quercetin phytosomes. The key mechanism is the same: phosphatidylcholine complexation allows quercetin to be absorbed through lipid transport pathways in the intestine, bypassing poor water solubility barriers.
Best-evidenced uses: Same as quercetin overall — anti-inflammatory, antioxidant, URI prevention, cardiovascular support — with the advantage of predictable therapeutic plasma levels. See the Quercefit and Quercetin pages for complete clinical evidence.
Practical note: This page consolidates the 'quercetin phytosome' category. For the brand-specific evidence review (Quercefit), see that page. For the full quercetin clinical evidence review including non-phytosome studies, see the main Quercetin page.
What is Quercetin Phytosome?
Phytosome technology (developed by Indena SpA) involves mixing herbal extract with phosphatidylcholine in specific ratios under controlled conditions, forming a non-covalent molecular complex. X-ray crystallography confirms that quercetin's hydroxyl groups form hydrogen bonds with the phosphatidylcholine headgroup. This complex is taken up by brush border cell membranes as a single unit, with quercetin entering the enterocyte within the lipid matrix.
Phytosome technology was developed for multiple botanical compounds including silymarin (from milk thistle), curcumin (Meriva), and quercetin (Quercefit) by Indena SpA, a major Italian phytopharmaceutical company. The technology is now used by multiple manufacturers. Independent head-to-head bioavailability studies confirm that quercetin phytosome significantly outperforms plain quercetin.
Evidence-based benefits
1. Bioavailability advantage
Quercetin phytosome achieves 15–20× higher plasma quercetin AUC compared to plain quercetin at equivalent doses. This is the primary evidence distinguishing phytosome from plain quercetin — establishing the foundation for all therapeutic applications.
2. Clinical applications (same as Quercetin page)
Anti-inflammatory, URI prevention, cardiovascular support, antioxidant — see full Quercetin evidence review.
Supplement forms compared
| Form | Typical dose / Bioavailability | Best for | Notes |
|---|---|---|---|
| Quercefit (Indena — branded quercetin phytosome) | 250–500 mg/day | Most studied; reference standard | Patented, well-characterized. |
| Generic quercetin phytosome | 250–500 mg/day | Similar if properly formulated | Variable quality; look for PC ratio disclosure. |
How much should you take?
- 250–500 mg quercetin phytosome/day with food
- Same dosing as Quercefit — see that page for indication-specific doses
Same as quercetin and Quercefit. See main Quercetin page for full safety and drug interaction details.
Safety and side effects
Common side effects
- Same adverse effects as quercetin — see Quercetin page
Serious risks
Same drug interactions as quercetin. Plasma levels from phytosome are much higher than plain quercetin — drug interactions may be more clinically relevant.
Drug and nutrient interactions
- Same drug interactions as quercetin — see Quercetin page for complete details
Check our free interaction checker for additional combinations.
Who might benefit — and who should use caution
| Most likely to benefit | Use with caution or seek guidance |
|---|---|
| Those choosing quercetin supplements who want to ensure therapeutic bioavailability | Same population guidance as quercetin page |
Frequently asked questions
Is quercetin phytosome worth the extra cost?
Yes, for therapeutic applications — plain quercetin at typical supplement doses rarely achieves plasma levels sufficient for the anti-inflammatory and antiviral effects studied in RCTs. Phytosome form ensures you're actually achieving therapeutic plasma levels at practical doses. For general dietary polyphenol supplementation, plain quercetin from food sources (onions, apples) may be sufficient.
See the Quercefit page and the main Quercetin page for full evidence review.
Related ingredients
Quercefit (Branded Form)
Indena's patented quercetin phytosome with the most clinical data.
Quercetin (Full Review)
Complete clinical evidence, FAQ, and drug interaction review.
Disclaimer: This information is for educational purposes only and should not replace medical advice. Always consult a qualified healthcare provider before starting any supplement, especially if you have a medical condition, are pregnant, or take prescription medications. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.