[retrac]

> Oxalic acid has an oral LDLo (lowest published lethal dose) of 600 mg/kg.[62] It has been reported that the lethal oral dose is 15 to 30 grams.

and

> Frozen commercially available spinach in New Zealand contains 736.6 ± 20.4 mg/100g wet matter (WM) soluble oxalate

while the USDA says about 900 mg per 100 g for American spinach on average.

So roughly 1% of the wet spinach by weight. 1 kilo of high-oxalate spinach probably has 10 - 20 grams of oxalic acid. That's a lot of spinach, but probably chuggable in one day in smoothie format. Far too close to the LD50 estimate for my comfort!

For one large salad, it's unlikely to exceed a couple grams. I'm unsure about the effects of chronic lower dose exposure.

[hombre_fatal]

This is what I mean, though. How many people regurgitating "Be sure to watch out for oxalates!" know that we're talking about thousands of grams of spinach?

Looking it up, people generally eat 50-200mg of oxalates per day with 1000mg being the outlier high end.

Eat your spinach. If you're worried, then cook it.

[DennisP]

Well there's the dose that kills you, but there's also the dose that over time gives you kidney stones, if you're prone to that.