In a study of over 100 adults living in North Carolina, those taking a daily multivitamin reported less infection, such as respiratory and urinary tract infections, flu and gastro-intestinal infections, and a lower rate of illness-related work absenteeism, than those receiving a placebo. The most striking results were seen among those subjects with diabetes.

A group of adults aged over 45 years old took a multivitamin and mineral supplement or placebo daily for one year. The researchers report that more participants receiving placebo reported an infectious illness over the study year than did participants receiving multivitamin and mineral supplements (73% versus 43% of those receiving vitamins). Infection-related absenteeism was also higher (57%) in the placebo group than in the treatment group (21%). There were 51 subjects involved in the study with type 2 diabetes. In this group, 93% taking the placebo reported an infection compared with only 17% of those receiving supplements.

The researchers said that the results on diabetes patients were likely due to the correction of micronutrient deficiencies.

Source: Annals of Internal Medicine 2003;138:365–371