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what happens if you inject b12 into a blood vessel Vitamin Injection Dose for Adults: 7 Dosage Facts can you inject b12 into
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The strongest data comes from Harshini Neelakantan, Stan Watowich, and colleagues at the University of Texas Medical Branch (UTMB)

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High-Dose Oral Supplements For individuals without issues absorbing B12 from their gut, high-dose oral supplements can be surprisingly effective
Patients with a history of kidney stones or renal impairment should use with caution