I was skeptical but I was at my wits end. One of my best girls had a severely impacted crop to the point I thought surgery was necessary. Then I watched a video about treating impacted crops with mineral oil. I figured it was worth a try. Everyday for the past week I gave her 1 ml twice daily and massaged her crop. I could not get her to vomit it up so this was my only option. Finally today I went out to give her her medicine to find her crop had completely emptied! Just thought Id share this for others. The UK product is known as liquid paraffin but here in the US its known as Mineral Oil USP. The best part is it only costs about 6 bucks