I believe R.G. has said that the customized rounds of Humaworm, which he prepared himself, in the past, are not so much extra-strength as they are targeting YOUR specific types of parasites, if you know which those are.
I know he has prepared customized rounds for those who wish to avoid certain ingredients, as well.
In my experience Humaworm is both gentle AND powerful, which sounded rather odd until I realized that only one third of the herbals actually kill parasites, while another third helps eliminate their bodies and toxins, and the remaining third helps rebuild strengths in our organs.
For me, it seems as though my immunity increased, and is now working hand-in-hand with the formula...to show improvements faster and faster.
When I realized also that the body can handle only so much die-off of parasites at one time...I am quite glad to wait...making better choices elsewhere, in the meantime.
I hope this helps.