The popular herbal supplement, St John's wort, is an ineffective treatment for depression, a major study has found.
The use of herbs has grown massively in recent years as more people opt for so-called natural medicines.
Researchers have conducted the largest ever clinical trial into the impact of the herb on major depression - a moderately severe form of the condition.
The researchers, from Duke University Medical Center in North Carolina, found it had no more impact than a dummy medicine.
Source BBC News