vitamin B1 vitamin B1 PMID:28859374 vitamin B1 thiamines vitamin B1 vitamers Any member of the group of 1,3-thiazolium cations that exhibit biological activity against vitamin B1 deficiency in animals. Symptoms of vitamin B1 deficiency include constipation, loss of apetite, fatigue, nausea, delirium, blurry vision and muscle weakness. Severe vitamin B1 deficiency can also lead to a disease known as beriberi. Vitamin B1 consists of the vitamer thiamin and its acid, aldehyde and phosphorylated derivatives (and their corresponding ionized, salt and hydrate forms). vitamins B1 thiamine PMID:32554808 chebi_ontology thiamins vitamin B1 vitamer CHEBI:26948 vitamin b1 aminopyrimidine 1,3-thiazolium cation B vitamin