Can Vitamin C cause blood in urine?
Blood in the urine is the symptom of a rare genetic deficiency called G6PD
How much vitamin C were you taking and have you been diagnosed with this condition?
The problem is caused by too little glutathione in red blood cells (as a result of this genetic anomaly) and if this is what you are experiencing (rather than a bladder injury or bladder cancer See someone! ) the fix is to take liposomal glutathione.