Hi Joan have no fear, you heart and every cell in your body use coq10 for energy, people with angina take about 150 to 200mg a day, and it relieves the symtoms, and makes the heart work a lot stronger. There is also research into giving large doses to people suffering from heart attacks and strokes, results being far less damge to heart and brain. There are some fantastic results coming through with treating cancer patients with it aswell, they are given a dose of 400mg a day. The only symtom you should get from this large dose is more energy, more efficent heart and circulation, a super charged immune system, and hopefully no more critters. So good luck
PS the trials above also showed another strange side effect, some people had marked improvement in there eyesight and hearing, odd. :)