Carnitine is a useful nutrient to supplement for 60 days if you have low energy. Carnitine helps cells in the body use fatty acids for fuel. In my medical practice I use the form acetylcarnitine as it may be particularly helpful for lowering blood pressure and for re-building unhealthy heart muscle. The reason I say might is because many nutrients have not been fully studied enough to have conclusive knowledge of their benefits. The safety to risk ratio is very favorable, however for most nutrients, and so I use them as currently used.