b12 1000mcg injection Out of Stock - VITAMIN (Generic) Injectable Solution, 1000-mcg/mL, 100-mL vial - Easy Refills 12 per dose Contains a sterile vitamin B Amazon Pharmacy: Vitamin B12 (Injectable

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While the NIH does not specify a tolerable upper intake level for vitamin B12, a study published in the JAMA Network Open found that high intakes of vitamin B12, such as from daily supplementation of 25 micrograms or higher, increased the risk of bone fracture [3] [4]

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High concentrations of vitamin B12 may be due to underreporting supplement use, autoimmune disorders interfering with the B12 assay, or underlying renal or liver diseases

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