Hello - the regular HUMAWORM is potent enough for all parasite infections. More info about it can be found here: http://www.humaworm.com (go to the formula page) The extra strength is custom mixed to fight resistant parasites on a case by case basis. When folks have resistant parasites, the parasites have to be treated differently in order to be removed.
I have seen HUMAWORM remove OLD OLD OLD parasites from folks - especially from military veterans. If you decide to use HUMAWORM, please be rest assured that it is probably the strongest, freshest herbal parasite cleanse on the market. Thank you!