Niacin. A more safe bet is to purchase a masker. Check health food/vitamin shops. StripNC is the brand I use and it's fail safe. Taking niacin without knowing how much could lead to bloating/water intoxication. Find a masker brand that's got a diuretic(pom or cranberry juice concentrate) and b12(naturally found in urine. If you ain't got none, they'll no you faked).
Secondly, you going to a clinic? Where they let you close the door? Someone clean's piss under the balls works pretty decently usually.
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