The implications of this effect are not well understood
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In addition to fatigue, a deficiency of B12 can lead to other symptoms like pale skin, headaches, depression, gastrointestinal problems, difficulty concentrating, decreased mental function, mouth and tongue pain or inflammation, and paresthesia in your hands and feet
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Injection technique Subcutaneous injection is straightforward: Clean injection site with alcohol swab Pinch skin to create a fold Insert needle at 45-90 degree angle Inject slowly Remove needle and apply gentle pressure Common injection sites: abdomen (2 inches from navel), thighs, love handles