Im using an isotonic drink before hard training(iso plus).it has l-carnitine and l glutamine.does it harm my liver or my health in general?

Probably fine to use: Sports drinks are usually not needed (water does fine). If a person drinks >16oz bottle, he'll be getting more sugar than he might want. On websites, iso plus has 24g, gatorade g has 28g, and powerade has 28g of sugar per 16oz. All have some potassium (k) and sodium (na). Small amounts of Amino Acids are put into various drinks, but may be for marketing strategy, rather than the human body's need.

Iso-plus ingredients: L-carnitine & l-glutamine are generally safe in most people. In those who already have liver disease, glutamine can exacerbate the condition. If you are sensitive/allergic to msg (monosodium glutamate) you may also react to glutamine supplements.

No: In general no however any supplements should only be taken in the context of a full health assessment.