Vitamins may be. Fat soluble (vitamins A, D, E, and K) Water soluble (B vitamins and vitamin C) The B vitamins include biotin, folate, niacin, pantothenic acid, riboflavin (B2), thiamin (B1), B6 (eg, pyridoxine ), and B12 (cobalamins). For dietary requirements, sources, functions, effects of deficiencies and toxicities, blood levels, and usual Signs of deficiency can include dry skin and poor wound healing, although symptoms may not always be apparent. Learn all about the four types of fat-soluble vitamins: A, D, E, and K. Scurvy. Folate. Folate Folate and vitamin B12 are 2 of the most clinically important water-soluble vitamins. Deficiencies can present with megaloblastic anemia, GI symptoms, neuropsychiatric symptoms, and adverse pregnancy complications, including neural tube defects. Folate and Vitamin B12. and vitamin B 12. 2.1. Luminal Phase. The luminal phase primarily affects the digestion of some macronutrients (fats and proteins) and also of micronutrients whose absorption depends on their adequate assimilation, especially fat-soluble vitamins (vitamins A, D, K, and E), as well as minerals such as calcium, dependent on the correct absorption of fats, and others such as vitamin B12, dependent on adequate Classification, Functions, Requirements, Deficiency symptoms, and Food sources of Carbohydrate, Protein, Fat/Lipids, Water, Vitamin and Minerals Fat soluble vitamins (persist in liver, renal In general, the requirements for these vitamins have been more carefully researched than the water-soluble vitamins. Fat-soluble vitamins are stored in the body which can result in toxicity issues with excess consumption. Water-soluble vitamins: The water-soluble vitamins include: Vitamin B1 (Thiamin) Vitamin B2 (Riboflavin) Vitamin B3 (Niacin) kXwdyP.