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{| class="wikitable"
! Vitamin !! Tolerable Upper Intake Level (UL) !! Harmful effects
|-
! Vitamin B1
| None || No known toxicity from oral intake. There are some reports of [[anaphylaxis]] caused by high-dose thiamin injections into the vein or muscle. However, the doses were greater than the quantity humans can physically absorb from oral intake.
|-
! Vitamin B2
| None || No evidence of toxicity based on limited human and animal studies. The only evidence of adverse effects associated with riboflavin comes from ''[[in vitro]]'' studies showing the production of [[reactive oxygen species]] ([[free radicals]]) when riboflavin was exposed to intense visible and UV light.
|-
!Vitamin B3
| US UL = 35 mg as a dietary supplement || Intake of 3000 mg/day of nicotinamide and 1500 mg/day of nicotinic acid are associated with nausea, vomiting, and signs and symptoms of liver toxicity. Other effects may include glucose intolerance, and (reversible) ocular effects. Additionally, the nicotinic acid form may cause vasodilatory effects, also known as [[Flushing (physiology)|flushing]], including redness of the skin, often accompanied by an itching, tingling, or mild burning sensation, which is also often accompanied by [[pruritus]], headaches, and increased intracranial blood flow, and occasionally accompanied by pain. Medical practitioners prescribe recommended doses up to 2000 mg per day of niacin in either immediate-release or slow-release formats, to lower plasma triglycerides and low-density lipiprotein cholesterol.
|-
! Vitamin B5
| None || No toxicity known.
|-
! Vitamin B6
| US UL = 100 mg/day; EU UL = 25 mg/day || See [[Megavitamin-B6 syndrome|Megavitamin-B6 syndrome]] for more information.
|-
! Vitamin B7
| None || No toxicity known.
|-
! Folate
| 1 mg/day || Masks B12 deficiency, which can lead to permanent [[neurological]] damage.
|-
! Vitamin B12
| None established || Skin and spinal lesions. Acne-like rash [causality is not conclusively established].
|}

Translations:B vitamins/16/en - Revision history

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