It looks as if some are hoping for the eureka effect which is unlikely to occur as the compound is only an amino acid and for a single amino acid to be effective it requires to be taken on an empty stomach otherwise the body utilises it for other purposes. The late Dr Hans Nieper and his colleagues found that l-carnitine supported the heart by releasing more energy to it; apparently it helps at preventing heart degeneration. Dr Nieper also combined this with magnesium orotate and vitamin B1 (brewer's yeast may be better) on treating his patients. It is also known to dramatically reduce cholesterol deposits and to clean fatty acid deposits from the heart (see p78-79 The Curious Man). CO-Q10, serrapeptase, and hawthorn extract, act similarly. Anyone suffering from cardiac problems should ramp-down on vegetable oils in their diet which are potent immune suppressors and return to saturated fats which, contrary to the hype, are a buffer against ill health.
Anyone on a diet and tempted, during the first few days to indulge in something to eat, should take l-carnitine which has a beneficial effect on the brain chemistry and quells the desire (Dr Atkin). It worked for me.
I usually have a tub of l-carnitine at home and now in the process of replenishing the supply.