The new vitamin received the letter K because the initial discoveries were reported in a German journal, in which it was designated as Koagulationsvitamin
A safe, compliant pathway is to use licensed telehealth or in-person clinics that can evaluate your symptoms, confirm deficiency when appropriate, and prescribe an approved product
For most researchers, 2 mL is the sweet spot
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Sand IK, Benn EK, Fabian M, Fitzgerald KC, Digga E, Deshpande R, et al