L-Carnitine is a naturally occurring amino acid found in animal tissue (meat products) and milk to a degree, it is also a constituent of human breast milk.
L-Carnitine has many mechanisms by which it can theoretically increase the rate of fat loss, yet it doesn't seem to actually induce or augment fat loss when supplemented. The exception to this is in a deficiency state, in which L-carnitine supplementation will restore hindered fat burning potential.
Insulin sensitivity can be increased with Carnitine supplementation in obese persons and those with impaired glucose tolerance, such as pre-diabetes and those with metabolic syndrome.
Improvements in sensitivity have been noted as quickly as 10 days with 2 g of Carnitine supplementation, although this particular study required a hypocaloric diet in conjunction with Carnitine supplementation.
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