Source: https://www.amazon.com/Beef-Gelatin-Powder-Grass-Fed/dp/B01M2A5BL2/ref=as_li_ss_tl?s=grocery&ie=UTF8&qid=1497636573&sr=1-5&keywords=grass+fed+gelatin&linkCode=sl1&tag=detoxinista-20&linkId=f4e1610a588d62af5541ae38c333a212