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Vegetarians, vegans, and people who eat little animal protein may fall short

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The signs you may need B12 supplementation include persistent fatigue, neurological changes, and blood-related abnormalities

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In summary, the key interactions to consider are pyridoxines reduction of levodopa and anticonvulsant efficacy, niacinamides additive effects on blood pressure, blood sugar, and gout management, and the potential need for B-vitamin repletion in patients on certain medications (diuretics, isoniazid, etc.)