How Much Oxalate Is in Purslane?
mg oxalate
per serving
Serving: 1 cup (40 g)
Verdict: 🔴 Avoid
Per 100g: 621 mg
Data: Harvard T.H. Chan SPH (2024)
Here's the takeaway: Purslane is a Avoid food (🔴) at 248 mg oxalate per serving — past the 100 mg line. The safest approach is choosing a lower-oxalate alternative instead. If it shows up occasionally in a meal, keep the portion minimal and boost fluids.
Putting Purslane in context: it lands well above the category average of 27 mg. In the database, 80% of vegetables (219 of 271) fall in the 🟢 Safe group (under 25 mg oxalate/serving). The typical vegetables here averages 27 mg oxalate per serving, so Purslane runs 818% 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 vegetables rated Avoid for a full side-by-side.
Why does oxalate per 100g matter?
Per-100g values put every food on the same scale, which is handy when serving sizes differ a lot between foods — or when your portion doesn't match the standard serving. It lets you compare apples to apples on oxalate density. For Purslane, the measured oxalate value is 248 mg per 1 cup (Avoid).
How accurate is the oxalate measurement?
The measurements use ion chromatography, the accepted reference method for oxalate. That means real lab values for each food rather than inferred numbers. Some natural variation exists between samples, but this is the strongest published data set. Applied to Purslane: 248 mg oxalate per 1 cup — Avoid per Harvard (2024).
How does this compare to other foods?
Foods under 25 mg per serving are rated Safe. Foods between 25-99 mg are Caution. 100+ mg is Avoid. Check the food's category page on OxalateWatch to see how it compares to similar foods. Purslane comes in at 248 mg oxalate per 1 cup (Avoid) in the measured database.