size needle for b12 injection best syringes injections best syringe for b12 for B12 Injection: 5 Must-Know Tips gauge needle for b12 injection
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Vitamin B12, in its natural form, is safe during pregnancy and breastfeeding
Once the needle is in the muscle, the plunger is pulled back slightly to ensure the needle is not in a blood vessel

It is worth noting that unlicensed medicines can be lawfully supplied in limited circumstances for example, as 'specials' manufactured to meet the specific clinical needs of an individual patient under a prescriber's direction
Most people tolerate the injections very well, and side effects typically resolve quickly