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B12 is important to keep your nervous system working properly
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Overall, Collins says the twice-weekly injections have helped him feel more physically active (he does 100 pushups every morning and another 100 at night before bed), socially engaged, and optimistic about this stage of his life
Biological passport evolution The Athlete Biological Passport tracks biomarkers over time rather than testing for specific substances
This shows that care must be taken in interpreting blood measurements, and that ideally one would like to conduct experiments in which both intracellular and extracellular concentrations are measured
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