Huge fan here of probiotics! I started taking them when I was combating a systemic candida infection. We now take them regularly, even our 2 year old son. With the probiotics, vitamin C, and vitamin D3, we are rarely sick.
Huge fan as well. Even make sure my dogs get a tablespoon of organic yogurt on their food twice a day. It really helped get my girl dog back to normal after a very bad reaction to medicine from the vet. It wrecked her intestinal track and she suffered from severe diarrhea, then small, cat like poo for weeks. Once I introduced the yogurt, she was back to normal in a few days. They love it and think its some special icing. LOL.