lump under skin after b12 injection Site Reactions: Symptoms, Treatment, and Prevention Hard Lump Under Injection Site:

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Anyone can be affected, but some groups are more at risk: Vegetarians and vegans, since B12 mainly comes from animal products Older adults, as absorption gets harder with age People with digestive issues like Crohns or coeliac disease Those taking certain medications, such as long-term metformin or stomach acid reducers People with pernicious anaemia, an autoimmune condition that stops you from absorbing B12 If you fit into one of these categories and notice symptoms, its worth getting your levels checked

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The absorption of this vitamin is a complex process that involves the stomach, pancreas, small intestine, and liver, so if any one of those organs isnt functioning well, less B12 gets absorbed