Unfortunately human studies done to date don't appear to be as favorable as the above work which was done on rats.
Vasc Med. 2009 Aug;14(3):239-48.
The effect of L-arginine and creatine on vascular function and homocysteine metabolism.
Kidney Int. 2004 Dec;66(6):2422-8.
Creatine supplementation does not decrease total plasma homocysteine in chronic hemodialysis patients.