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Injections deliver the vitamin directly into your bloodstream for faster absorption and immediate benefits, while supplements offer a convenient daily option for long-term maintenance
Storing the punctured bottle at room temperature, or in a frequently-opened fridge with temperature swings, accelerates preservative degradation
The preservative prevents new growth but cannot eliminate bacteria already introduced through puncture events
Older adults often produce less stomach acid, which is necessary to release B12 from food
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