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How to Improve Your VO2 Max VO2 max is improved through structured cardiovascular training: Zone 2 training (aerobic exercise at 60% to 70% max heart rate) builds mitochondrial density and fat oxidation capacity

For vitamin B12 to be absorbed from the gut, it must bind to a protein called intrinsic factor, which limits how much B12 the gut can take in at one time

J Clin Endocrinol Metab (1997) 82(2):5859

However, current evidence does not fully imply this recommendation

Padayatty SJ, Katz A, Wang Y, Eck P, Kwon O, Lee JH, Chen S, Corpe C, Dutta A, Dutta SK, Levine M (2003) Vitamin C as an antioxidant: evaluation of its role in disease prevention