Ichthammol is not a trade name, it is a generic name. The product is available from many manufacturers in different formulations.
I wonder if anyone has tested various brands to see if one works better than the others, or if most brands come from the same factory?
I had purchased the one that was the “overall best pick” from Amazon but IMO it did not work like the old one my mother had. I think Big Pharma made them in some way dilute it, at the very least.