I remember Doc mentioning how he used Turmeric to support a young dog with chronic weight loss, and that he had good success with it.
Is your goat eating well? Have you ruled out parasites with it yet? Parasites can greatly affect a goat’s weight, so that might be an area you may want to look into. There are also couple of health conditions that can cause weight loss, so if your goat is getting plenty to eat, and isn’t dealing with a heavy parasite load, you might want to consider talking to a vet.