I'm sorry to say I have no idea about the supplements or pumpkin seeds, but I thought someone should answer your post. I don't think we are ignoring you, but maybe no one knows or has any advice about this. At least I don't. I have had dogs all my life, and it seems to me that this is something that I just learned to put up with when they were older. But I don't remember any of them having the problem at 13 1/2 years of age. More like 15 or 16. (I know I have to get up more often in the middle of the night, now that I am older LOL!!!!)