One trial found it to have an effect above placebo.
A single trial of vitamin D did not find benefit.
On May 3, 2005 the last trial ended with no one found guilty of the bombing.
For example, a 1982 trial of 175 patients found tumor size had increased in all but one patient.
However, two large clinical trials found no benefits at all.
A smaller trial from Canada with 318 women found similar results.
The trial also found a high incidence of side effects, including nausea and back pain.
A similar trial with elderly humans also found significant cognitive improvement.
A "special trial" conducted in May 2012 found the ship fit for the deployment.