What Are Oxalates

Oxalates are acids found in nature, usually in plants and nuts and seeds.  Oxalate-rich plants include fat hen, sorrel, and several Oxalis species. The root and/or leaves of rhubarb and buckwheat are high in oxalic acid.

Other edible plants that contain significant concentrations of oxalate include, in decreasing order…

• Star Fruit
• Black pepper
• Parsley
• Poppy seed
• Amaranth
• Spinach
• Chard
• Beets
• Cocoa
• Chocolate
• Nuts
• Berries
• Fishtail palms
• New Zealand spinach
• Beans
• Leaves of the tea plant

…contain among the greatest measured concentrations of oxalic acid relative to other plants.