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Cellular: How well your cells create energy, repair damage, and maintain function
Concentration and cognitive function may also be affected
Other Possible Effects : Oral versions may cause mild digestive issues
Wellness 27 May 2026 8 min read B12 injections: who actually needs them and how often
Some people also report cravings for sugary or carbohydrate-heavy foods because low B12 causes fatigue, and the body seeks quick energy sources to compensate
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