OneSource is a multivitamin that can be used to treat vitamin deficiencies or to supplement diet during pregnancy or certain diseases, states WebMD. In 2013, both Time magazine and CBS News reported that a series of recent studies revealed multivitamins are not making people healthier, and doctors are advising people to stop taking multivitamins such as OneSource.
OneSource is a brand of multivitamins with tailored formulas to meet the needs of different populations. It is available online and at Walmart stores. The authors of a study published in the Annals of Internal Medicine in 2013 concluded that multivitamins containing vitamin B, vitamin E and possibly high doses of vitamin A are harmful. They further indicated that multivitamins such as OneSource are ineffective in preventing diseases. The researchers concluded that multivitamins should not be used for chronic disease prevention because they have no clear benefit for well-nourished adults and may even be harmful.
Dr. Edgar Miller, a co-author of the study, told CBS News that people should focus instead on eating a balanced diet rich in fruits, vegetables, nuts and low-fat dairy instead of wasting their money on multivitamins. Time magazine reported that a panel of experts convened by the United States Preventive Services Task Force concluded that there was insufficient evidence to support that multivitamin pills can ward off heart disease or cancer, and in fact, beta carotene use contributed to an increased risk of lung cancer in smokers.