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Can a vitamin B12 (cobalamin) injection cause cardiac problems such as hypertension, tachycardia, or arrhythmias?

[6] [25] At levels only slightly below normal, deficiency can result in fatigue, headaches, feeling faint, rapid breathing, pale skin, numbness or tingling, poor appetite, heartburn, poor balance, difficulty walking, poor reflexes, blurred vision, memory problems, depression, irritability, inattention, cognitive decline, dementia, and even psychosis

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Building on these findings, tolerability has also proven favorable, with side effects limited to mild gastrointestinal symptoms