Enlarge / Contains belladonna, aka deadly nightshade. (credit: Homeolab) The Food and Drug Administration sent a sharp letter this month to a Canadian-based homeopathic pharmaceutical manufacturer named Homeolab USA. The letter warned of “significant violations” the agency found during a recent inspection and poor quality control of the company’s infant teething products that contain the deadly poison belladonna, aka deadly nightshade. The letter, dated August 2 and posted on the agency’s website Wednesday, includes a lengthy list of quality and manufacturing process failures that render Homeolab’s products “adulterated,” the agency concluded.