Morin (Flavonol · Xanthine Oxidase Inhibitor · Uric Acid Modulator)

CAS No.	480-16-0
Class	Polyphenol · Flavonol · Flavonoid
Source	Psidium guajava (Guava) leaves and fruit; Morus alba/nigra (Mulberry) wood; Maclura pomifera (Osage orange)
Claim strength	Moderate
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Name and structural position: Morin is named from Morus (mulberry), the genus from which it was originally isolated. Structurally it is the 2′-hydroxy isomer of quercetin — with the B-ring hydroxyl at the 2′ rather than the 3′ position — a shift that substantially changes its receptor binding profile and gives it unusually high metal chelation capacity. Xanthine oxidase inhibition: Morin inhibits xanthine oxidase — the enzyme responsible for uric acid production that pharmaceutical gout treatments (allopurinol, febuxostat) also target — making it one of the few dietary flavonols with a direct mechanistic basis for uric acid management. Neuroprotective interest: Morin's exceptional aluminium and iron chelation capacity has attracted interest in Alzheimer's disease research, where transition metal accumulation in neural tissue is a documented feature of pathology. Traditional use: Guava leaf extract (containing morin alongside quercetin and rutin) has been used in traditional Ayurvedic and Southeast Asian folk medicine for blood glucose management for centuries, supported by modern clinical trial evidence.

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Evidence for Uric Acid Management, Neuroprotection & Antioxidant Activity

Xanthine oxidase inhibition and uric acid: Morin inhibits xanthine oxidase in vitro, reducing enzymatic conversion of hypoxanthine and xanthine to uric acid. Animal models of hyperuricaemia show significant uric acid reductions. Human clinical evidence for isolated morin is limited. Claim strength: Moderate (preclinical strong; limited human data for morin isolate).

Neuroprotection via metal chelation: Chelates aluminium and iron with unusually high affinity; inhibits amyloid-β aggregation in vitro. Multiple rodent studies demonstrate cognitive performance improvements and neuroprotection in Alzheimer's disease models. Claim strength: Emerging.

Antioxidant and anti-inflammatory: Pentahydroxy structure provides strong radical-scavenging capacity. Inhibits COX enzymes, reduces pro-inflammatory cytokines, and activates Nrf2. Claim strength: Moderate.

Blood glucose support — guava context: Guava leaf extract (morin + quercetin + rutin) has been studied in human trials for postprandial blood glucose reduction. Morin's α-glucosidase inhibitory activity contributes to the mechanism. Claim strength: Moderate (guava extract); Emerging (isolated morin).

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Dosage & Formulator Notes

Dose range: No established human clinical dose for isolated morin. Animal studies use 50–200 mg/kg. Guava leaf extract trials (containing morin among other polyphenols) have used 400–800 mg extract/day. Proposed supplement dose: 100–300 mg/day of morin isolate.

Natural source approach: Most conveniently incorporated via guava leaf extract or mulberry extract. For formulations specifically targeting xanthine oxidase inhibition, a combination approach using guava/mulberry extract plus isolated quercetin or morin covers both morin-specific and quercetin-mediated xanthine oxidase inhibition.

Synergistic pairs: Guava leaf extract (natural source with clinical glucose trial evidence), mulberry leaf extract (complementary uric acid + glucose management; DNJ for α-glucosidase inhibition), tart cherry extract (anthocyanins + flavonols for comprehensive uric acid support), celery seed extract (comprehensive gout support formula).

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Frequently Asked Questions — Morin

How does morin compare to allopurinol for uric acid management?
Allopurinol is a pharmaceutical xanthine oxidase inhibitor for treating diagnosed gout. Morin also inhibits xanthine oxidase but at much lower potency. Morin is not a pharmaceutical alternative. Appropriate positioning is as a dietary supplement supporting healthy uric acid levels as part of a healthy lifestyle, combined with other natural xanthine oxidase-modulating compounds (quercetin, cherry extract) for comprehensive support.

What makes morin's metal-chelating properties notable?
Morin has exceptionally high affinity for aluminium and iron ions — higher than most dietary flavonols. The aluminium chelation is of interest in Alzheimer's disease research, where aluminium accumulation in brain tissue is a documented feature. By chelating and mobilising aluminium, morin may reduce aluminium-induced neurotoxicity alongside its amyloid-β inhibition and anti-neuroinflammatory mechanisms.

Which is the better source of morin — guava or mulberry?
Guava leaf extract (morin + quercetin + rutin) is extensively studied in human trials for blood glucose management and is the more commonly used clinical source. Mulberry wood and bark contain morin alongside 1-deoxynojirimycin (DNJ) — a potent α-glucosidase inhibitor. Choice depends on formulation intent: guava leaf for the established glucose management evidence; mulberry for the combined glucose and alpha-glucosidase inhibition approach.

Is morin structurally related to quercetin?
Yes — morin is the 2′-hydroxy isomer of quercetin. Both are pentahydroxy flavonols with five hydroxyl groups. The positional difference of a single hydroxyl group (2′ vs 3′ on the B-ring) substantially changes receptor binding profile and produces morin's distinctive xanthine oxidase inhibition and metal-chelation characteristics.

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Claim-strength scale – High = multiple human RCTs; Moderate = limited trials or strong preclinical convergence; Emerging = early-stage lab or animal data.

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