and this is DEFINITELY not good...

Effect of megadoses of ascorbic acid on serum and urinary oxalate.

Hatch M, Mulgrew S, Bourke E, Keogh B, Costello J.

Serum and urinary oxalate was determined in 9 normal subjects, ingesting 8 g of ascorbic acid daily. Serum oxalate levels increased to 310% of control values during supplementation. Plasma ascrobate levels reached a mean value of 3.6 mg% far exceeding the previously reported plateau level of 1.8 mg%. Urinary oxalate gradually increased during ascorbate intake and 7 days post cessation of ascorbate, rose unexpectedly for all subjects into the hyperoxaluric range.

in case you dont know what oxalate is...(i didnt, until i researched it )

"Oxalate is an organic acid with the chemical formula of C204. At physiological pH levels, it forms a soluble salt with sodium and potassium; however, when combined with calcium, it produces an insoluble product termed calcium oxalate, which is the most common chemical compound found in kidney stones. If oxalate did not have a high affinity for calcium and if the calcium oxalate product was not of low solubility, there would be little interest in oxalate or oxalate metabolism. Urinary oxalate is the single strongest chemical promotor of kidney stone formation. Ounce for ounce, it is roughly 15-20 times more potent than excess urinary calcium"