b12 injections im or subq Best Vitamin Injection Site: Administering B12 Shots are vitamin b12 injections given
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Many women find this gives quick relief during particularly heavy days
Summary: Feeling worse after a B12 injection typically reflects your body adjusting to replenished vitamin levels, triggering metabolic processes that may temporarily cause fatigue, headaches, or injection site discomfort
M.et al (2009)
