MSM has seemed to help with my infestation, however I may have not been taking enough. I came across this on msm-info.com
One of the most amazing discoveries on MSM is its anti-parasitic action against Giardia, Trichomonas, roundworms, nematodes, Enterobius and other intestinal worms (5). Animal studies include laboratory mice, determined to have pin worms (Enterobius) by fecal cast examination. They were given commercial food and drinking water, both containing 2% MSM by weight. After 17 days, fecal examination indicated the feces were free of worms and eggs. The blood level of MSM in one animal examined exceeded 30 ppm or mg/kg (3). Human studies include a man with confirmed Giardia lamblia, apparently contacted from contaminated water in a primitive area. He was given 500 mg MSM three times a day for 14 days. By the eighth day he was free of symptoms, and two stool specimens collected one week later were free of the organism (3). In another study, Trichomonas vaginalis was successfully treated by oral dosage of 1 gram MSM a day, and a daily topical application of 5% aqueous MSM for one week (3).
The major antiparasitic property of MSM is probably caused by its ability to bind to the mucosa and present a natural blocking interface between hosts and parasites. It's as though MSM puts down a coating on the mucosa, which parasites find impenetrable and can't cling to. Unable to stick, the parasites are simply flushed out of the body (5, 9). In vitro research has shown the antiparasitic, antifungal and antibacterial action of MSM concentrations. MSM concentrations of 1 mg/mL and less demonstrated no significant inhibition of Giardia lamblia. However, at 20 mg/mL concentrations it was strongly inhibitory, and concentrations above 40 mg/mL promptly killed the organism. According to Dr. Herschler, one can safely administer up to 1-2 gram MSM per kg body weight on a daily basis. One therefore builds a safely tolerated blood level up to 4000 ppm (mg/kg), which level is highly toxic to many infective organisms yet is harmless to the host (3).
A growing number of natural physicians are expressing concerns about parasites. It is becoming increasingly clear that they can be a continuous source of poisoning which can spread throughout the body and affect the immune system. It is an intriguing thought thatDOSAGES AND USAGE
The optimal dosage depends on the nature and intensity of the complaints. In most cases, it is sufficient to take an initial dose of three 1-gram tablets twice daily (children ten and under take a tablet twice daily, older than ten, take two tablets twice daily). After several months this dosage can be reduced to two tablets twice daily. People with serious ailments have been shown to benefit from higher dosages, up to four 1-gram tablets three times daily. Such a high dosage may be advised to fight parasital infections. Case studies have been reported in which patients did not show noticeable improvement until they received a daily dosage of 30 grams (6). Such extreme dosage is not generally recommended for most people, although no negative effects were reported (3,6).
It is recommended to gradually increase the dosage from two tablets twice daily, and not to increase the dose as long as detoxification symptoms persist. Although uncommon, these symptoms may include nausea and headaches (see below). MSM is best taken with a glass of water one half hour prior to taking a meal. As it tends to stimulate one's energy level, it is generally advisable not to take it prior to retiring for the night.
MSM maybe nature's original means of protecting us against parasites.