Is your vet sure that his weepy eyes are something that will go away on their own? I'd probably get a second opinion, especially since you said the discharge is smelly. I wouldn't use any chemicals or anything around his eyes, especially with the eye issues he's already got going on. You don't want to risk irritating him more.
Vitamins and supplements really aren't necessary as long as you are feeding him a proper diet. They get all the vitamins and minerals they need out of their food and pellets have added vitamins/minerals in them. Vitamins don't cause animals to gain weight anyways - calories do. Unless he has some kind of a digestion issue where he's not getting vitamins from his food, but in that case he probably wouldn't be able to process the vitamins in a supplement either.
I have a fully grown male Lionhead who is only 2 lbs. Healthy rabbits usually look lean, are you sure he's underweight? If he's really very skinny/bony and is not gaining weight despite a healthy diet, I'd talk with a vet about that. I had a rabbit in the past who was very skinny and wouldn't gain weight and it turned out to be caused by a medical condition.
I don't know much about the foods in the pellet mixture you described. Pellets should just be plain boring old pellets, no added berries or nuts or anything like that. If you're really trying to get him to gain weight, you could try using plain alfalfa pellets.
Rather than trying to fatten him up by feeding him fattening food and junk, I'd just concentrate on feeding him a healthy diet. If he's an older rabbit, you can try giving him alfalfa pellets and hay to help maintain his weight. Other than that, if he is really underweight, I'd talk to a vet about it. He may have something going on medically that's causing him to not maintain a healthy weight, or it could be because he's an older rabbit. Either way, a good rabbit vet should be able to help you out.
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