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{| class="wikitable"
!Vitamin!! Name !! Deficiency effects
|-
! Vitamin B1
| [[Thiamine]] || [[Thiamine deficiency]] causes [[thiamine deficiency#Beriberi|beriberi]]. Symptoms of this disease of the [[nervous system]] include weight loss, emotional disturbances, [[Wernicke encephalopathy]] (impaired sensory perception), weakness and pain in the limbs, periods of [[Heart arrhythmia|irregular heartbeat]], and [[edema]] (swelling of bodily tissues). [[Heart failure]] and [[death]] may occur in advanced cases. Chronic thiamine deficiency can also cause [[alcoholic Korsakoff syndrome]], an irreversible [[dementia]] characterized by [[amnesia]] and compensatory [[confabulation]].
|-
! Vitamin B2
| [[Riboflavin]] || [[Riboflavin deficiency]] can cause [[ariboflavinosis]], which may result in [[Angular cheilitis|cheilosis]] (cracks in the lips), high sensitivity to sunlight, [[angular cheilitis]], [[glossitis]] (inflammation of the tongue), [[seborrheic dermatitis]] or pseudo-[[syphilis]] (particularly affecting the [[scrotum]] or [[labia majora]] and the [[nasolabial folds|mouth]]), [[sore throat|pharyngitis]] (sore throat), [[hyperemia]], and edema of the [[Pharynx|pharyngeal]] and [[Wiktionary:oral|oral]] [[mucous membrane|mucosa]].
|-
! Vitamin B3
| [[Niacin (nutrient)|Niacin]] || [[Niacin deficiency]], along with a deficiency of [[tryptophan]], causes [[pellagra]]. Symptoms include aggression, [[dermatitis]], [[insomnia]], [[weakness]], mental confusion, and [[diarrhea]]. In advanced cases, pellagra may lead to [[dementia]] and death (the 3(+1) D's: dermatitis, diarrhea, dementia, and death).
|-
! Vitamin B5
| [[Pantothenic acid]] || [[Pantothenic acid deficiency]] can result in [[acne]] and [[paresthesia]], although it is uncommon.
|-
! Vitamin B6
| [[Pyridoxine]], [[pyridoxal]], [[pyridoxamine]] || [[Vitamin B6#Deficiency|Vitamin B6 deficiency]] causes seborrhoeic dermatitis-like eruptions, pink eye and neurological symptoms (e.g. [[epilepsy]]).
|-
! Vitamin B7
| [[Biotin]] || [[Biotin deficiency]] does not typically cause symptoms in adults, other than cosmetic issues such as decreased hair and nail growth, but may lead to impaired growth and neurological disorders in infants. [[Multiple carboxylase deficiency]], an inborn error of metabolism, can lead to biotin deficiency even when dietary biotin intake is normal.
|-
! Folate
| [[Folic acid]] || [[Folic acid deficiency]] results in a [[macrocytic anemia]], and elevated levels of [[homocysteine]]. Deficiency in pregnant women can lead to birth defects, particularly [[neural tube defect]]s such as [[spina bifida]] and [[anencephaly]].
|-
!Vitamin B12
| [[Cobalamin]]s || [[Vitamin B12 deficiency|Vitamin B12 deficiency]] results in a [[megaloblastic anemia|macrocytic anemia]], elevated [[methylmalonic acid]] and [[homocysteine]], [[peripheral neuropathy]], sense loss, change in mobility, memory loss and other cognitive deficits. It is most likely to occur among elderly people, as absorption through the gut declines with age; the autoimmune disease [[pernicious anemia]] is another common cause. It can also cause symptoms of [[mania]] and [[psychosis]]. Untreated, it is possible to cause irreversible damage to the brain and nerve system — In rare extreme cases, paralysis can result.
|}

Translations:B vitamins/13/en - Revision history

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