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Renal impairment reduces B12 excretion, leading to accumulation
Bacteriostatic water shelf life and the 28-day rule Unopened: the Pfizer/Hospira label gives no shelf-life figure only store at 20 to 25 C. Expiry is the lot-specific printed date
A.KisemboM
A 2025 meta-analysis of 16 studies involving 6,098 participants found no statistically significant difference between intramuscular, oral, and sublingual B12 supplementation routes
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