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Volkow ND, Wang GJ, Fowler JS, Hitzemann R, Angrist B, Gatley SJ, et al
Sometimes, injecting it into a muscle can help increase the supplements effectiveness
The 28-day rule United States Pharmacopeia (USP) general guidelines indicate multi-dose vials containing preservatives such as benzyl alcohol may be used for up to 28 days after the initial puncture, provided they are stored properly and free from visible contamination
However, there are certain conditions in which vitamin B12 cannot be absorbed, for example, due to dietary insufficiency, malabsorption, or lack of intrinsic factor, hepatic stores are depleted, and deficiency ensues
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