How Much Oxalate Is in Guava?
mg oxalate
per serving
Serving: 1 medium (120 g)
Verdict: 🟡 Caution
Per 100g: 70 mg
Data: Harvard T.H. Chan SPH (2024)
Here's the takeaway: Guava falls in the Caution band (🟡) at 83 mg oxalate per serving. Not off-limits, but not free — moderate portions, a few times a week at most, and preferably with dairy or another calcium source at the same meal.
Putting Guava in context: it lands well above the category average of 21 mg. In the database, 89% of fruits (101 of 113) fall in the 🟢 Safe group (under 25 mg oxalate/serving). The typical fruits here averages 21 mg oxalate per serving, so Guava runs 291% above that baseline. That places it on the higher end for oxalate in its category. Why this matters: the gap between two Safe foods can be wide — one may hold 5 mg oxalate while another sits at 24 mg. The lower one leaves more room in your day. See all fruits rated Caution for a full side-by-side.
Why does oxalate per 100g matter?
The per-100g number lets you compare foods on an equal-weight basis, regardless of serving size. It's useful when two foods have very different typical serving sizes, or when you eat more or less than a standard serving. For Guava, the measured oxalate value is 83 mg per 1 medium (Caution).
How accurate is the oxalate measurement?
These values come from Harvard's 2024 ion-chromatography analysis — the gold-standard method for oxalate. Real measured data rather than estimates. Sample-to-sample variation exists, but no published source is more dependable for food oxalate. Guava comes in at 83 mg oxalate per 1 medium (Caution) in the measured database.
How does this compare to other foods?
The ratings split at 25 mg (Safe) and 100 mg (Avoid), with 25-99 mg in the Caution band. For context against similar foods, the category pages on OxalateWatch rank every item in that group by oxalate. Applied to Guava: 83 mg oxalate per 1 medium — Caution per Harvard (2024).