Vitamin B12 is suspected of causing asthma. This list is a compilation of various sources including those that "may cause sensitization by inhalation" and includes some agents that are identified according to the Association of Occupational and Environmental Clinics (AOEC) as asthmagens or chemicals of concern for their potential to cause asthma.
Vitamin B12 is suspected of causing cancer, according to official classification designated under an EU regulation known as EU - CLP (1272/2008) as well as those designated by the International Agency for the Research on Cance (IARC) as IARC Group 2B (Possibly Carcinogenic to Humans) substances.
It is not on any of GoodGuide’s lists of toxic chemicals which cause suspected or recognized health effects.
It has not been detected in human tissue or urine.