Nutritional hyperhomocysteinaemia

This editorial by Mohan and Stansby (12 June, pp 1569-70) contained an error in the dose given for folic acid supplementation. The third sentence of the fifth paragraph should have read: “The effective dose of supplementation has not yet been determined, but maximal therapeutic effect is seen with doses over 400 μg [not 400 mg] and after four to six weeks.”