How do you know you have vitamin deficiency?

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Another serious consequence of severe vitamin C deficiency is scurvy, which depresses the immune system, weakens muscles and bones and makes people feel fatigued and lethargic (24). Other common signs of vitamin C deficiency include easy bruising, slow wound healing, dry scaly skin and frequent nosebleeds (22, 24).

http://www.jrhealthblog.com/6-signs-that-you-have-a-deficiency-of-v...