I thank Chris for asking the sensitive question. It has come up before. With the reality that doctors do not check for internal parasites, it's a good idea to use food grade diatomaceous earth on a daily basis whether you know or don't know if you have internal parasites. If you know you have internal parasites, then you may want to consider the aggressive approach I had in an update a month or so ago. Following is the protocol:

Use the following schedule for Monday thru Friday--take nothing on Saturday and Sunday
First week: One teaspoon a day
Second Week: one teaspoon twice a day
Third Week: one and a half teaspoons twice a day
Fourth week: one tablespoon twice a day
Fifth week: one and a half tablespoons twice a day
Sixth week:; Start over from the first week, i.e. back to one teaspoon a day.

And, of course, enemas are always a good idea and can be boosted by adding NG concentrate to the solution.