can b12 injections stop your period Why Do I Feel Worse After My Injection? Causes & Management – Bolt Pharmacy Period Delay: Frequently Asked Questions
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Periorificial dermatitis (small, red, inflamed bumps around the nose, mouth, or eyes) can be one of the first signs of deficiency, developing within three weeks of low intake

Nausea Nausea is another rare but reported side effect

SAM Metabolism and Epigenetics Ulanovskaya et al
The liver stores significant amounts of B12, providing a reserve that can last several months to years, depending on the individual's metabolic needs and the severity of prior deficiency
Notably, these neurotoxic effects are rarely seen at doses below 100 mg/day in adults
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