Study co-author Dr. William Christen at Harvard-affiliated Brigham and Women's Hospital in Boston gave 21,000 male doctors 50 milligrams of beta carotene every other day or a placebo, the doctors not knowing which they received. The progress was monitored over an average 12 year period.

According to MSNBC.com, ?Roughly the same number of doctors in both groups developed the eye condition, suggesting beta carotene didn't help or hurt. After 12 years, there were 162 cases of macular disease in the beta carotene group and 170 cases in the group taking the dummy pills. The difference in the numbers was not statistically significant, meaning it could have occurred by chance.?

Dr. Stewart find from the University of Pennsylvania commented, ?This study at least suggests that beta carotene might not be an important component of that (vitamin) formulation.?

This could be good news for smokers. Taking beta carotene while smoking is said to increase smokers chances of contracting lung cancer. Doctors have suggested that smokers concerned about macular degeneration find a vitamin regiment substituting other vitamins in place of beta carotene.

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