Vitamin B12 and Heart Palpitations Explained Qaly What Causes B12 Side Effects? Do others experience side effects from vitamin B12 supplements? Caffeine can boost alertness, but too much can increase anxiety and disrupt sleep. Our fact sheet breaks down how and why.
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vitamin b12 injection side effects jittery anxiety palpitations Can B12 Cause Anxiety? Evidence and UK Guidance – Bolt Pharmacy