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A significant sign that the injections are working is a reduction in symptoms of vitamin B12 deficiency, such as weakness, rapid heart rate, easy bruising or bleeding, and pale skin

UK practice can vary by hospital

Common deficiency symptoms that can affect sexual function include: Persistent fatigue and weakness that reduce sexual stamina Nerve issues causing tingling or numbness that may affect sensation Mood changes and depression that decrease libido Muscle weakness that limits physical performance Cognitive fog that interferes with arousal and focus These symptoms can develop gradually, making them easy to attribute to stress or other factors