Some UK product information leaflets (SmPCs) for B12 preparations do mention skin reactions as potential side effects, though not all specifically list acne
Position the medication away from direct contact with ice packs and monitor temperature with a portable thermometer
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Methylcobalamin helps maintain nerves, shields the myelin sheath, and stimulates the production of red blood cells
The benzyl alcohol suppresses the small number of bacteria that might ride in on a needle, which keeps a minor contamination from blooming into a real problem across repeated draws
In rarer cases, vitamin B12 can cause more serious side effects such as an irregular heartbeat or heart palpitations, hives, and anaphylaxis