How do you take niacin to pass a drug test?

Niacin has the effect called the niacin flush, which is an opening of the small blood vessels, the capillaries, so that more blood flows through them. In this way the toxins which are stored in these fatty tissues can be removed into the bloodstream and processed out of the body. But it does not help in the short term.

Also large dosages cause skin reactions and health problems and many companies are testing for abnormal levels.