McLeod W R, Horne D J
J Neurol Neurosurg Psychiatry. 1972 Aug;35(4):510-3. doi: 10.1136/jnnp.35.4.510.
Daily use of 7 g l-tryptophan and 70 mg pyridoxine for 14 days led to no deterioration of objectively measured manual motor skills in a small group of patients with Huntington's chorea.