While theres some regulation on how theyre produced, the FDA isnt really reviewing them to make sure that theyre safe or effective before they go to market, Haggerty says
Intramuscular injection bypasses the digestive system entirely, which may be particularly relevant for patients with gastrointestinal conditions, medication interactions, or nutrient-specific absorption challenges
You can buy B12 injections online for self-administration but make sure to follow your providers direction
Concomitant deficiencies (iron, folate), chronic illness, or drug interactions may blunt clinical response and warrant further evaluation
We recommend consulting your OB-GYN along with our providers
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