There's new hope for people who suffer Obsessive-Compulsive Disorder as Australian researchers begin trials of a promising new treatment based in Brisbane.

Scientists hope a simple vitamin could ease the suffering of almost 500,000 Australians living with OCD and will investigate the effectiveness of an amino acid supplement known as NAC.

Clinical Research Fellow, Professor Jerome Sarris, hopes the trial may lead to an alternative treatment option for people with the debilitating condition.