Hulda clarks ozonised olive-oil and cysteine treatment is a mop-up cleanse do after your regular parasite cleanse. The mop-up is done for three weeks. I would'nt say that it is for severe cases, but rather for all parasite cases! :)
The mop-up programme will eliminate any remaining eggs and larvae of tapeworm and ascaris that was "accidently" left from the parasite cleanse.
Ozonotaed olive oil is very strong therapy.
I have been in contact with very nice man selling high quality oxonated olive oil to a reasonable price. I have spoken with him myself and he is extremely helpful and kind. He is also here in curezone at oxygen forum.
This oil he recomended for me for the specific mop-up cleanse (he is well aware of the mop-up cleanse) and is designed specifically for it. Your friend will need about 600-700 ml of the oil.