The injection is their only source of B12
However, in very rare cases, some people can experience side effects caused by allergic reactions or sensitivity ( If you experience any side effects, speak with your doctor
[10] Many older adults benefit from supplementation or consumption of fortified foods, as crystalline B12 in supplements and fortified products doesn't require stomach acid for absorption
Injectable is systemic and reported as faster in user diaries
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MRI results showed mainly reversible brain atrophy with delayed myelin formation, although some patients had normal MRI findings [94,95,96]