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At first, they get 1,000 mcg injections every week for 4-8 weeks
Some GI adjustment (mild nausea, fullness) is normal and passes within 2-4 weeks
The improvement in energy is often noticeable because the body is able to quickly absorb the vitamin directly into the bloodstream, bypassing any digestive absorption issues
True B12 toxicity symptoms are rare but may include skin reactions, mild gastrointestinal disturbances, and headaches, particularly with injections
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