Nicacin?

[Burnt Toast]

The role of niacin in detoxification

Is that site the best you can come up with? How about some independant corroboration? Personally I place credence on sources with much more legitimacy than a site with obvious leanings toward Scientology. The site makes no specific addressing to THC metabolites anyway. You are wrongly assuming that THC metabolites are among the "toxins" being referred to. THC is non-toxic, so it is incorrect to call THC a "toxin".

Bottom line is that your link provides nothing of evidentiary value. But keep trying.