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. What is the cause of a panic attack and derealization the day after a Vitamin B12 (B12) injection? Taking Vitamin B12? Read this first. While B12 is often hailed as a safe energy and brain booster, many real users are reporting unexpected side effects including anxiety, insomnia,
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vitamin b12 injection side effects jittery anxiety palpitations Can B12 Cause Anxiety? Evidence and UK Guidance – Bolt Pharmacy