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Deficiency causes multiple problems, but adequate or excess B12 provides nothing but benefits to your energy, strength, and mental sharpness
If you have persistent tiredness, its a good idea to talk to a healthcare provider to find the root cause
Intravenous administration might be better in some cases
Now, if you follow these tips, is it okay to take expired vitamin B12 injections
The NHS notes that taking up to 2,000 micrograms daily is unlikely to cause harm in most people, though there is generally no benefit to such excessive amounts without confirmed deficiency
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