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This is because the most abundant source of B12 for most humans is consuming animal products
The 50 mg setup is far easier to draw accurately (20 units is a clean, mid-barrel mark) because the higher concentration and larger per-dose amount land on a bigger, more forgiving volume
Long-term deficiency could potentially lead to nerve damage
FAQ Anyone experiencing fatigue, B12 absorption issues, or seeking to improve their energy and metabolism could benefit from B12 Injections
As to the pain "going in" it may be that the needle caught a nerve or vein plus the fact that you were probably a little tense and nervous
Mostly I seem to feel good for 2 weeks then bad for 3 weeks, on, off and the cycle repeats
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