Updated: Nov 15, 2018
Supplements with the designation of all-natural are not always all-natural. Manufacturers will sometimes spike their products with chemicals to produce the desired effect as stated in their advertisement and not list the substance on the label. For example, some manufacturers advertise all-natural weight loss pills but then spike it with sibutramine, a prohibited substance.
Some companies advertise herbal sex-enhancement pills, but these pills frequently contain Viagra-like drugs.