Are any pesticides used on the sheep’s wool that the vitamin D (cholecalciferol) is extracted from?
In modern sheep farming, pesticides have to be employed to protect sheep from ectoparasite infestations. Hence there is a potential for pesticides to be present in wool grease which is a by-product of the wool scouring industry.
Cholesterol is manufactured via extraction from wool grease. Using extensive testing using modern analytical instrumentation over a number of years it has been shown that all the pesticides that are currently used in sheep farming are removed during the manufacturing processes applied; hydrolysis during the saponification of the wool grease or by removal or degradation of pesticides during the purification process.
Fortunately today removal is aided by the fact that modern pesticides are designed to degrade quickly after use in the environment. Modern pesticides are therefore easily broken down during the manufacturing steps employed.