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At 10 mg/mL, that is exactly 25 units on an insulin syringe
Choosing between oral supplements and injections depends entirely on your individual health status, the severity of your deficiency, and your ability to absorb the vitamin
Menon SG, Sarsour EH, Spitz DR, Higashikubo R, Sturm M, et al
The body requires enough time to absorb sufficient supplement levels from oral sources, particularly when the deficiency reaches severe levels
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