Helmlinger, G., Netti, P
They can be used intermittently and are a popular therapy for exhaustion, burn out, migraines and of course post-party nausea
Unopened vials exposed to room temperature for short periods (under 6 hours) can be returned to refrigeration, but repeated temperature cycling progressively degrades preservative effectiveness even before the vial is punctured
However, it would appear that a small amount of cobalamin can be synthesized by the intestinal flora present in an area unable to absorb it [2], therefore making the vitamin unavailable
Thankfully, appropriate levels of Glutathione can be produced through physical activity, avoiding beverages high in alcohol, ensuring a balanced diet, and consistent sleep
Results vary and are not permanent without maintenance