New research suggests that extra vitamin D could make a major difference in heart disease risk among people who have low levels of the nutrient.

The new report found that just 32 percent of the 328 drug studies reviewed involved comparisons of medicines that were currently available.

The new PET scanning technology allows researchers to look for the plaques, known as amyloid-beta deposits, in the brains of living people.

Long-term use of marijuana can lead to increased risk of developing hallucinations, delusions and psychosis, a new study shows.The researchers found there was an association between length of marijuana use and mental health.

A medication used to treat type 2 diabetes appears to help overweight teenagers lose weight when combined with a program designed to help them change their lifestyle habits.

Along with preventing pregnancy, hormonal contraceptives also treat menstruation-related disorders such as severe menstrual pain and heavy menstrual bleeding.