The Mice & Rat Acute Toxicity Studies were performed in China by Institute of Materia Medica CAMS & PUMC, Beijing, by Professor Guifang CHENG, Dept. of Pharmacology.

No LD50 could be reached, however they tested up to the equivalent of 10 kg Yeast Cell Wall per complete tonne of feed with no adverse effects. The typical dosage range established for Yeast Cell Wall is 20-350 grams / Complete feed tonne.