> Oxalic acid occurs in many plants and is toxic in very large amounts. Some
> of the plants that contain a significant amount of oxalic acid are
spinach,
> collards, and rhubarb. Because oxalic acid binds with calcium and iron, it
> inhibits their absorption by the body and is not well-assimilated.
>
> If a person is having difficulty with his, symptoms can occur like kidney
> stones and vulvar pain in women.
Here are a couple of links to info you might find useful:
http://www.branwen.com/rowan/oxalate.htmhttp://www.ixion-biotech.com/home.htm
Norm