should b12 be injected subcutaneously or intramuscularly How to Inject Vitamin B-12 Intramuscular vs. Subcutaneous Injection

ATGL-catalyzed lipolysis regulates SIRT1 to control PGC-1/PPAR- signaling

Structural basis for activation of fatty acid-binding protein 4

Slowly inject the vitamin B12 solution

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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