the MSM dosage for
treating Giardia to be 500 mg - 3 times a day for
two weeks, then continue with 1000 mg a day to help prevent Giardia re-infestation. Once an animal/human has Giardia infestation, they may have a reoccurrence of it throughout out their life."
So keep that in mind. According to the Vita-Flex label you can double this dose under stress. The following instructions from the container are for Canine use of MSM. 1/4 teaspoon = 1000 mg or 1 gram
1- 45 lb.