<P> A popular way of increasing one's vitamin B intake is through the use of dietary supplements . B vitamins are commonly added to energy drinks, many of which have been marketed with large amounts of B vitamins with claims that this will cause the consumer to "sail through your day without feeling jittery or tense ." Some nutritionists have been critical of these claims, pointing out for instance that while B vitamins do "help unlock the energy in foods," most Americans acquire the necessary amounts easily in their diets . </P> <P> Because they are soluble in water, excess B vitamins are generally readily excreted, although individual absorption, use and metabolism may vary ..." The elderly and athletes may need to supplement their intake of B and other B vitamins due to problems in absorption and increased needs for energy production . In cases of severe deficiency, B vitamins, especially B, may also be delivered by injection to reverse deficiencies . Both type 1 and type 2 diabetics may also be advised to supplement thiamine based on high prevalence of low plasma thiamine concentration and increased thiamine clearance associated with diabetes . Also, Vitamin B (folic acid) deficiency in early embryo development has been linked to neural tube defects . Thus, women planning to become pregnant are usually encouraged to increase daily dietary folic acid intake and / or take a supplement . </P> <Table> <Tr> <Th> B number </Th> <Th> Name </Th> <Th> Thumbnail description </Th> </Tr> <Tr> <Td> Vitamin B </Td> <Td> thiamine </Td> <Td> Casimir Funk discovered thiamine in 1912 . </Td> </Tr> <Tr> <Td> Vitamin B </Td> <Td> riboflavin </Td> <Td> D.T. Smith and E.G. Hendrick discovered riboflavin in 1926 . Max Tishler invented methods for synthesizing it . </Td> </Tr> <Tr> <Td> Vitamin B </Td> <Td> niacin or nicotinic acid </Td> <Td> Conrad Elvehjem discovered niacin in 1937 . </Td> </Tr> <Tr> <Td> Vitamin B </Td> <Td> pantothenic acid </Td> <Td> Roger J. Williams discovered pantothenic acid in 1933 . </Td> </Tr> <Tr> <Td> Vitamin B </Td> <Td> pyridoxine, pyridoxal, pyridoxamine </Td> <Td> Paul Gyorgy discovered vitamin B in 1934 . </Td> </Tr> <Tr> <Td> Vitamin B </Td> <Td> biotin </Td> <Td> Dean Burk was a codiscoverer of biotin . </Td> </Tr> <Tr> <Td> Vitamin B </Td> <Td> folic acid </Td> <Td> Lucy Wills discovered folic acid in 1933 . </Td> </Tr> <Tr> <Td> Vitamin B </Td> <Td> various cobalamins; commonly cyanocobalamin or methylcobalamin in vitamin supplements </Td> <Td> Various scientists over several decades developed our knowledge of vitamin B . </Td> </Tr> </Table> <Tr> <Th> B number </Th> <Th> Name </Th> <Th> Thumbnail description </Th> </Tr>

B-complex vitamins are found mostly in which group of foods