7. Drug Screens
Some chemicals taken orally supposedly will mask traces of drugs in urine. Advertisers like to present their diuretic as a masking agent to make the sale. Consequently, diuretics are often mistaken for drug screens. Most herbal products claim to do a lot more than they actually do. Don't be fooled by herbal potions that claim to flush or absorb toxins.
7.1 Drug Screens That Work
There is testing industry data that taking four aspirin a few hours prior to the test might help you. Aspirin interferes with the EMIT assay. It seems that aspirin absorbs at the same wavelength that NAD does, which is how it interferes with the assay. Two reliable sources have tested aspirin and found it to interfere with the EMIT. In the future, they will try to find a way to circumvent this test flaw. Until then, I certainly recommend taking advantage of the situation and using aspirin.
7.2 Drug Screens That Do Not Work
Goldenseal has shown to work on occasion. However, some labs are reportedly testing for Goldenseal. Goldenseal is very unreliable, and California NORML advises against using it. Goldenseal, as a screen, only works on the thin layer chromatography (TLC) test, which is not used anymore.
Niacin has been shown to work on occasion, but this is purely a coincidence. Byrd Labs tests conclude that niacin doesn't work at all. In other words, something else probably caused a negative, not the niacin.
7.2.3 Zinc Sulfate
Zinc sulfate is claimed to bond with THC metabolites, and because it's a solid, it gets passed as stool rather than urine. Jeff Nightbyrd says it does nothing. Anne Watters Pearson said that "zinc sulfate is no miracle drug for pissing. Forget it."
7.3 Untested Drug Screens
Puri-Blend is claimed to "block" metabolites from entering the bloodstream and to "neutralize" all drugs in the urine. I don't believe it myself. It can be found in GNC stores.
7.3.2 The Stuff
The Stuff is claimed to absorb toxins in the body and block detection of true and false positives. Sold by J&J Enterprises.