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Description
Aspirin blocks COX, antihistamines block histamine receptors, and so on

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

Cells were then incubated for 30 minutes at RT

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That scientific context supports documentation review, not product-use guidance
