Sorry, but you can't do that anymore. You used to be able to do this, but now, virtually all the vitamins available will turn your pee a weird shade of blue or green if you take enough of them to change the color. Everybody's pretty much caught onto this old trick.
I guess it wouldn't hurt to ask at one of those weird health food stores, but I don't think they are much more credible than the guys at the head shop.
The only fool-proof way to do this, in my opinion (never seemed worth it to me) is that fake weiner rig some places sell online, and to use someone else's clean pee. Super expensive, lol. And I've talked to a lawyer about this, if they catch you using this or anything else that you shouldn't have on you, you could be brought up on charges for possessing criminal tools. Good luck.
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