Before buying the horse paste, I did an internet search for the excipients. For example, among the results for a search for "Bimectin excipients" I found this: https://www.bimeda.co.uk/media/k2/attachments/1BIM105_Data_Sheet.pdf A search for "Noromectin excipients" produced this: https://imedi.co.uk/noromectin-paste-for-horses/summary Most brands have three or four ingredients in addition to Ivermectin. Find the list of excipients and do a search for each one to find out what they consist of. For example: Silica Colloidal Anhydrous is one of the excipients in Bimectin: https://www.wubmed.org/blog/silica-colloidal-anhydrous-colloidal-silicium-dioxide/ Titanium Dioxide (E171) is listed among the excipients in Noromectin: https://www.efsa.europa.eu/en/news/...onger-considered-safe-when-used-food-additive I have read that it's important that Ivermectin is the only active ingredient. Pastes or injectables with an additional active ingredient often have "plus" or "extra" in the name. I'll say a prayer for your full and speedy recovery.