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 B12 Injections for Energy: Benefits and How It Works AZ IV Medics 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 Too Much B12 Symptoms: Overdose Signs & Safe Dosage Bolt Pharmacy