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danb
hippy
You're likely hampering your training gains with Vit C (there's also evidence against the other common antioxidants).
http://ajcn.nutrition.org/content/87/1/142.full
"The administration of vitamin C significantly (P = 0.014) hampered endurance capacity. The adverse effects of vitamin C may result from its capacity to reduce the exercise-induced expression of key transcription factors involved in mitochondrial biogenesis."