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If the needle is too short for the person, or the angle is wrong, the dose can end up in subcutaneous fat, where absorption is slower and less predictable
If you are unsure whether B12 injections are right for you in the first place, that starts with your GP and a blood test, as set out in the NHS treatment pathway
This is also the period where non-responders become apparent
Different absorption methods used for these B12 forms lead to delayed testing outcomes
Use exactly as advised by your physician
The one real argument for injecting is bypassing first-pass metabolism, and the strength of that argument depends entirely on which bioavailability study you believe (3.5% in mice versus 38.4% in rats)
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