Awọn iwọn nla ti aflatoxins yori si majele nla (aflatoxicosis) ti o le jẹ idẹruba igbesi aye, nigbagbogbo nipasẹ ibajẹ si ẹdọ.
Aflatoxin B1 jẹ aflatoxin ti a ṣe nipasẹ Aspergillus flavus ati A. parasiticus.O jẹ carcinogen ti o lagbara pupọ.Agbara carcinogenic yii yatọ si awọn eya pẹlu diẹ ninu, gẹgẹbi awọn eku ati awọn obo, ti o dabi ẹnipe o ni ifaragba ju awọn miiran lọ.Aflatoxin B1 jẹ idoti ti o wọpọ ni ọpọlọpọ awọn ounjẹ pẹlu ẹpa, ounjẹ owu, agbado, ati awọn irugbin miiran;bakannaa awọn ifunni ẹran.Aflatoxin B1 ni a gba aflatoxin ti o majele julọ ati pe o ni ipa pupọ ninu carcinoma hepatocellular (HCC) ninu eniyan.Ọpọlọpọ awọn iṣapẹẹrẹ ati awọn ọna itupalẹ pẹlu chromatography tinrin-Layer (TLC), chromatography olomi-giga (HPLC), spectrometry pupọ, ati imunosorbent immunosorbent ti sopọ mọ enzymu (ELISA), laarin awọn miiran, ni a ti lo lati ṣe idanwo fun aflatoxin B1 kontaminesonu ninu awọn ounjẹ. .Gẹgẹbi Ajo Ounje ati Iṣẹ-ogbin (FAO), awọn ipele ifarada ti o pọju agbaye ti aflatoxin B1 ni a royin pe o wa ni iwọn 1–20 μg/kg ninu ounjẹ, ati 5–50 μg/kg ninu ifunni ẹran-ọsin ni ọdun 2003.