Oral administration of both tetrahydrobiopterin and L-arginine prevents endothelial dysfunction in rats with chronic renal failure.
Yamamizu K, Shinozaki K, Ayajiki K, Gemba M, Okamura T.
J Cardiovasc Pharmacol. 2007 Mar;49(3):131-9.
PMID: 17414224
doi: 10.1097/FJC.0b013e31802f9923