Here's one tincture that will work against ANY protozoa - amoebias, giardias, and cryptosporidium.
The Mexican use it traditionnally against amoebias. Their protocol is as follow:
30drops first thing in AM and 30drops before dinner for 7 days; stop for 7 days; do again for 7 days.
Just spoke to the company that sells it in L.A. - the lady's daughter took it for three months against giardiasis and got better. This herb also has antifungal properties.
In Mexican it is called Chaparro Amargo (Crucifixion Thorn in English and Castella Emoryi in Latin). This place sells a tincture made with glycerrhin, so not to disgusting to taste I guess.
Five bucks or so for a little bottle. I guess we need more than one.