Essential hormones as carcinogenic hazards.

The OSHA (Occupational Safety and Health Administration) considers certain substances to be carcinogenic including such hazardous chemicals as benzo(a)pyrene asbestos bis(chloromethyl) ether 2-naphthylamine and aflatchines B2 and G1 as well as natural substances such as estradiol estriol estrone progesterone tannic acid maltose and lactose. The results of the carcinogenic effects of these natural substances is in question because of administered dosage levels chemical structure of the substances the route the hormones entered the biological system and testing done in animals and in vitro. Citing lactose found in milk and nitrite found in saliva as carcinogenics shows a lack of discrimination between authentic carcinogenic hazards and evolved natural chemicals endogenously produced which are essential to survival. It is suggested that OSHA reappraise the substances to indicate the conditions under which substances may be considered a human health hazard including dosages and routes of entry.