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Theyre not replacing the need to train and eat right
It remains to be seen how practical and cost effective daily supplementation of carnitine with carbohydrate is Carnitine and endurance exercise The belief that carnitine is an ergogenic aid for endurance exercise is based on assumptions similar to the weight-loss assumptions: Carnitine concentration in muscle becomes too low to allow the transport of carnitine into the mitochondria to function at a high velocity Oral ingestion of carnitine increases the total carnitine concentration in muscle Any increase in muscle carnitine increases the oxidation rate of plasma FAs and intramuscular triacylglycerols during exercise Any increase in fatty acids will reduce muscle glycogen breakdown and postponing fatigue
doi: 10.1016/S0140-6736(17)31472-1 5 CarubbiFAlunnoAGerliRGiacomelliR
The third is duration and safety : short controlled studies in animals say almost nothing about what months or years of exposure would do in a human, which is precisely why the cycling section defaults to scheduled off periods rather than open-ended use
