You can get recommended amounts of vitamin B12 by eating a variety of foods including the following: Beef liver and clams, which are the best sources of vitamin B12 Fish, meat, poultry, eggs, milk, and other dairy products, which also contain vitamin B12 Some breakfast cereals, nutritional yeasts, and other food products that are fortified with vitamin B12
Fecal excretion of total carnitine was less than 1% of the administered dose.10 After attainment of steady-state following 4 days of oral administration of levocarnitine tablets (1980 mg q12h) or oral solution (2000 mg q12h) to 15 healthy male volunteers, the mean urinary excretion of levocarnitine during a single dosing interval (12h) was about 9% of the orally administered dose (uncorrected for endogenous urinary excretion)
However, some people may have difficulty absorbing or obtaining enough vitamin B12 from their diet, leading to a deficiency diagnosed by a simple blood test to measure your levels
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Mild nausea has also been reported in subjects who are administered doses in excess of 1mg
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