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B12 deficiency specifically causes neuropathy that reverses with supplementation

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"Cobalamin metabolism and its clinical aspects" (PDF)

Self-prescribing high-dose B12 without medical indication is inadvisable, particularly for individuals with underlying health conditions

It can also cause rashes, anxiety, nerve twitching, or heart palpitations

This reduced activity, combined with a potentially slower metabolism that can occur with persistent nutrient deficiencies, could indirectly contribute to weight gain over time