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That is the reason it is considered relatively safe even at high doses
16 B12 has a half-life of approximately six days in the blood, which usually means that it takes around six days before half of the injected amount is eliminated from the body
Some patients on NHS maintenance feel symptoms return before the next dose, which is a conversation for your GP, not a reason to add private top-ups unannounced
Intramuscular B12 injections bypass the digestive system for faster, more complete absorption than oral supplements, making them highly effective in treating deficiency and preventing complications like anemia, weakness, and neurological symptoms
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