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here, the main result is Theorem 3, which was independently proved by the author and Furdzik The 2017 paper has not been cited

Splitting the dose morning and evening may provide more consistent levels given the ~4 hour half-life

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If youre genuinely deficient or have an absorption issue which is common with vegetarians, older adults, GI conditions, and people on metformin or PPIs yes, B12 injections often produce meaningful improvements in energy, mental clarity, and mood within days to weeks

However, allergic reactions to preservatives or other ingredients in b12 formulations occur occasionally

Separate vials let the TB-4 or TB-500 dose rise without multiplying the other three