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5 Habits That Are Making You Lose Hair HuffPost . Obesity often requires taking larger doses of vitamin d supplements to reach and maintain normal levels. For people with lung diseases, a doctor should determine the optimal levels. NKF KDOQI Guidelines from kidneyfoundation.cachefly.net Vitamin b 12 deficiency symptoms. Given the array of symptoms a vitamin b 12 deficiency can cause, the condition can be overlooked or confused with something else. Either form of vitamin d ( d 2 or d 3 ) benefits the body, but very few foods naturally contain the nutrient or are fortified with it.