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These products differ in how they are made, how much vitamin B12 they contain, and how often they should be given
Sometimes preparation gets expired before time and it can be identified easily like color change, cloudiness or foreign particle in formulation proves its expiration
Some people need monthly injections, while others may space them further apart once levels normalize
[3] The speed of response depends on multiple factors including the severity and duration of deficiency, the presence of neurological complications, and individual metabolic differences
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