About Guava Leaf
Psidium guajava leaf is rich in flavonoids/quercetin and studied mainly for post-prandial glucose. A handful of small, mostly short-term or animal/in-vitro studies suggest a mild reduction in post-meal blood sugar, but human RCT evidence is thin and low quality. Guava fruit is separately a vitamin C source. Treat as low-evidence.
What Guava Leaf supports
- Flavonoid-rich leaf; preliminary interest in post-meal glucose
How much Guava Leaf to take
The RDA prevents deficiency. The effective range is what clinical trials used to actually move the outcome.
Effective
100–500
mg
No established therapeutic dose; small post-meal glucose studies used leaf tea/extract. Nominal range for a blend component.
Clinical evidence
Limited clinical evidence. Small, low-quality human studies on post-meal glucose; mostly preclinical.
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