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IM Injection Protocols for Pernicious Anemia Intramuscular (IM) shots are a common way to give vitamin B12 to those with pernicious anemia

However, many of Metformins potential longevity-related benefits, like cellular repair, improved metabolic markers, or disease prevention, happen silently and build over months or years

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The good news is that B12 is one of the safest vitamins, but there are a few things to know about high-dose supplements and when theyre actually necessary

Optimal timing enhances effectiveness while poor timing can waste a significant portion of each dose

Olasupo Odunsi, MD, Medical Director Reviewed July 5, 2026 If you're constantly tired and your metabolism feels stuck, low B12 could be part of the problem