4. Toxicology
 
 
There is practically no observable acute toxicity of humid acids on warm-blooded animals in oral applications (LD50 11500 mg/kg body weight). Therefore they are classified as non-toxic in the sense of the hierarchy of dangerous substances. There are no evident side-effects, allergies or resistance when given in permanent oral applications. Finally, because of their basic chemical structure, they are neither teratogenic nor mutagenic. They also do not possess any evident carcinogenic or embryotoxic properties.
 
Because of the lack of high self-resorption from the gastrointestinal tract, macromolecular humic acids do not form residues in the organisms of warm-blooded animals.