Some research suggests evening primrose oil may have a positive effect on menopause-related hot flashes, but other studies suggest no effect. Speak with your doctor before trying it for their advice.

It is the active component in Amgen's blockbuster drug Epogen, US sales of which rose 21% to $1.8 billion in 1999. Amgen accused TKT of infringing five US patents, which claim EPO and its ...