Amygdalin is hydrolysed by two enzymes (amygdalin hydrolase and prunasin hydrolase) most proficiently in crushed, moistened kernels, resulting in the formation of HCN and glucose A number of dietary deficiencies may well increase the threat of deleterious cyanide effects. Iodine deficiency is involved with the etiology of these thyroid disorders https://cyanolab.net/potassium-cyanide/