I recently switched from the brand of Melatonin I have used for years to Natrol. I did not change doses (.75mg daily), just brands. By the end of the first week of giving it, I noticed loose stools in some of the ferrets. Not putting the two and two together, I continued for another 2 or 3 days. When the stools continued to worsen a little every day, I got suspicious. I quit adding the melatonin to their soup and in 48 hours the symptoms lessened. We stopped using it, but too late I fear. In less than a month from the time I started the Natrol, I have lost two ferrets from internal bleeding, a week apart. Neither of these People had gastro-intestinal symptoms prior to this. I don't believe in coincidence. I have contacted the company requesting a list of ingredients and processing information. If I get it and our vet and I are able to learn anything definitive, I will pass it on. Meanwhile, please, don't use this brand of supplements for anything. Van and Ty, Momma loves you. [Posted in FML issue 4359]