The best way to give l-lysine is to order a 1 pound jar of pure powder from Amazon. It is the NOW brand. It is $16, and contains 822 doses. A quarter-teaspoon gives 500mg of L-lysine and is tasteless, odorless and can be sprinkled on top of their wet food. Give half the dose every 12 hours. They metabolize it in that time.
I don't know about the S.Boulardii, I have never had to use it.
I don't know about the S.Boulardii, I have never had to use it.