Proper injection technique and site rotation significantly reduce these
Adenosylcobalamin (energy production) works well with patients with low energy, often given in combination with hydroxocobalamin

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Methylcobalamin is the most expensive form of B12 however is favoured by Dr Knight due to its effectiveness with patients remotely and in clinic
However, it is a scientifically valid concern, raised repeatedly by researchers with nothing commercially at stake in either direction, and it is exactly the kind of signal that drowns in the noise of a forum full of people who currently feel fantastic