Rooibos tea hasn’t yet gained the popularity that green tea and mate tea have, but it turns out that Rooibos may have just as many benefits, if not more, than these well-known teas. It is important to note that Rooibos is technically an herbal tea and not
"In Defense of Oxalic Acid". An article describing its benefits and risks relating to the formation of kidney stones and the absorbtion of calcium. Includes a food chart with oxalic acid levels. A common source is rhubarb. A very good read!