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Conclusions Ultimately, the current maintenance dose of 1,000 mcg B12 every 3 months may confer long term harm, therefore it seems that once B12 levels are stabilised well within acceptable range, then the standard B12 intervention of 1000 mcg should be administered annually, and monitored with pre-injection annual testing of levels
Stronger Immune System Vitamin C and B12 are known for strengthening the immune response, reducing your chances of illness and improving recovery times after workouts or stress
The most reliable indicator is reduced or absent effects at your expected dose
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