Because 10 to 30 percent of older people may be unable to effectively absorb vitamin B 12 naturally occurring in foods, those older than 50 years should meet their RDA mainly by consuming foods fortified with vitamin B 12 or a supplement containing vitamin B 12
It is recommended that you gently tap the plunger of the syringe to release any air bubbles
Good hygiene, a fresh single-use needle and safe disposal remove most of that risk
However, it is not FDA-approved for human use and cannot legally be marketed as a drug, supplement, or for human consumption
Because methylcobalamin is classed as a nutritional supplement and is not a licensed prescription only medicine in the UK, it is not available via the NHS and is being offered more and more by non-healthcare and non-prescribing practitioners as a treatment for wellness, fatigue, and to boost energy, without making any medical claims around deficiency, and is rarely combined with a supplement of adenosylcobalamin