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Physical activity increases blood flow to the working muscles, which can accelerate absorption of subcutaneously injected medication in ways that are unpredictable
But how long do the benefits of a vitamin B12 injection last
A recent systematic review (Vasireddi et al., Am J Sports Med 2025) confirms the potential in sports medicine
It is shallow, so the needle only travels a short distance, and it has fewer pain-sensitive nerves than deeper tissue, so most people feel a small pinch rather than a deep ache
"Stable gastric pentadecapeptide BPC 157: Novel therapy in gastrointestinal tract." Current Pharmaceutical Design , 24(18), 1990-2001
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