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Within 48 hours after injection of 100 or 1000 mcg of vitamin B12, 50 to 98% of the injected dose may appear in the urine
The intracellular concentration of gamma-glutamylcysteine (GGC) is extremely low (~ 5 uM) when GS is present, thus GCL is considered the rate-limiting enzyme [6]
They want something targeted, evidence-informed, and medically supervised
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