vitamin b12 injections for autism in Autism: What the Research Says Injected methyl B12 may improve

Certain populations face higher deficiency risk: vegetarians and vegans (B12 is primarily found in animal products), adults over 50 (decreased stomach acid reduces B12 absorption), individuals with digestive disorders like Crohn's disease or celiac disease, and those taking medications like metformin or proton pump inhibitors

When you take pills or oral medicines, it takes time for them to work through your system and into your blood

Common Mistakes and Cautions The avoidable errors cluster in a few places

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If in doubt, one should consult the pharmacy or manufacturer for guidance or replace the vial with a fresh supply