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The two approaches answer different research questions and use different dosing conventions
Obviously, intracellular acidification happened under methionine semi-starvation
This makes hair testing valuable for detecting patterns of use rather than recent impairment
Elevated serum B12 values in serious conditions Maybe the concern for a possible overdose is caused by the knowledge that some life-threatening diseases can be accompanied by a strong increase in the B12 blood value, in some cases to even 30 times the upper reference value
ConsumerLab explores the topic of proper vitamin C supplement usage, and why taking too much can be harmful
