Carnitine can be found in dosages varying from around 200mg to over 1,000mg. There isn’t really an upper limit to how much you can take since it is an amino acid, but taking over 5,000mg per day does not seem to have any added benefit. (24) A typical dose in a carnitine supplement is generally 500mg or 1,000mg, which can be adjusted up or down depending on goals and needs.