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Kochman U, Sitka H, Kuniar J et al (2026) Targeted nanoparticles for drug delivery across the bloodbrain barrier in early and late stages of Alzheimers disease: a review

A deficiency in this essential vitamin can cause serious health problems such as anemia, fatigue, memory issues, and even long-term neurological decline

Serum holoTC is a better biomarker of recent B12 intake than serum B12 (or methymalonic acid or tHcy) because serum holoTC concentrations increase much faster after ingestion of B12 from a meal (i.e., 6 hours) or crystalline B12 from supplements

If bubbles form, let the vial rest refrigerated until the solution clears

Injections also eliminate the risk of gastrointestinal discomfort that some individuals may experience with oral supplements

Rotating injection sites can help minimize local reactions