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PMID 27138887

[5] Administering 100,000 IU intramuscularly establishes a high-capacity depot that may correct deficiency more predictably than oral dosing in malabsorption syndromes and maintains adequate circulating vitamin D over two to three months, an approach often referred to as Stoss therapy in endocrinology

At the time, I used lozenges to address this and literally used an entire bottle in one day

Parker, et al

Biological repair and adaptation rarely depend on a single signaling molecule, and many modern studies increasingly focus on network-level interactions rather than isolated mechanisms

More information, precautions and interactions can be found under the "About B Vitamins tab." Before taking any new medication, either prescription or over-the-counter, check with your doctor or pharmacist