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You may have health issues that interfere with your bodys ability to absorb the nutrient, you might not be getting enough in your diet, or you could be taking drugs that lower the levels of B12 in your body
Anecdotal users mention microgram to milligram ranges, but no standardized or safe dosing exists
There is no established tolerable upper intake level (UL), so even high-dose injections are safe because your system simply eliminates what it cannot use
4.4 Pharmacokinetic parameters in beagle dogs after intravenous and intramuscular administration In this part of the experiment, three male and three female beagles were examined for four cycles
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