If one is watching over oxalate intake from the food source, remember vitamin c, an innocent antioxidant that is vital for the immune system function etc , is metabolized to final state in oxalate. Any excessive vitamin-c becomes oxalate in your body that will accelerate forming oxalate stones in your kidney.
I was taking vitamin-c tablets daily intentionally in the hope to boost my immune system so that I can avoid getting colds etc. Instead I got another episode of kidney stone. now I know why i got the stone. stay away from excessive vitamin-c, take only necessary and sufficient amount of vitamin-c.