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If you have certain digestive disorders, including pernicious anemia, or have had gastric bypass surgery, oral B12 will simply not work because you can't absorb it correctly
Subsequent elevations in NAD+ levels activate sirtuin 1 (SIRT1), a cellular regulatory enzyme dependent on NAD+ availability
It also seems to act as an antioxidant, limiting the oxidative stress that typically slows tissue recovery
A needle length of 1 to 1.5 inches is generally recommended for adults
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