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Most evidence is from animal studies, but the consistency of results across 100+ studies and multiple tendon types is significant
The preservation of nicotinamide substrate drastically increases the efficiency of the NAD+ salvage pathway
PMC 9559827
While the effects of a vitamin B12 injected will become noticeable around 24 hours after administration, they will start to take effect almost immediately and will stay in your system for around 1 week, but may vary depending on the metabolic rate of the patient
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