do b12 injections have side effects of Vitamin Injection Understanding the B12 Vitamin Shot:

High expression of nicotinamide N-methyltransferase in patients with obesity and insulin resistance

This can lead to a feeling of exhaustion even after adequate rest

Its deficiency can lead to fatigue and lethargy

Intramuscular injections are generally inconvenient due to pain and require healthcare professionals for administration, thus increasing the economic burden on patients which ultimately leads to discontinuation of the treatment

Tests for pernicious anaemia are not always conclusive, but can often give your GP a good idea of whether you have the condition

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