Vitamin B12 Injections Southern Surgical Arts Did you know that 85% of the UK population are low on Vitamin B12? This can cause extreme tiredness, lack of energy, breathlessness, feeling faint, headaches, pale skin, heart palpitations, noise in Vitamin B12 deficiency can cause symptoms like headaches, fatigue, depressive mood, gastrointestinal issues, and more. While vegetarians are at a higher risk of vitamin B12 deficiency, it can affect non vegetarians too. Check Vitamin B12 Injection Side Effects and Safety Vitamin B12 Side Effects, What They Mean and More Dr. Axe