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Vitamin B12 injections can go into your muscle, under your skin, or through a vein
PubMed 11
Improved Mood and Mental Clarity: B12 helps regulate serotonin production, a neurotransmitter that influences mood, memory, and focus
Pediatric to premature neonates [see Warnings and Precautions (5.1)]
Rotate injection sites consistently, never using the same spot twice in a row
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