Science, Tech, Math › Science Is It Safe to Drink Urine? Under Differing Circumstances, Yes and No Share Flipboard Email Print Getty Images / MAURO FERMARIELLO Science Chemistry Basics Chemical Laws Molecules Periodic Table Projects & Experiments Scientific Method Biochemistry Physical Chemistry Medical Chemistry Chemistry In Everyday Life Famous Chemists Activities for Kids Abbreviations & Acronyms Biology Physics Geology Astronomy Weather & Climate By Anne Marie Helmenstine, Ph.D. Chemistry Expert Ph.D., Biomedical Sciences, University of Tennessee at Knoxville B.A., Physics and Mathematics, Hastings College Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. She has taught science courses at the high school, college, and graduate levels. our editorial process Facebook Facebook Twitter Twitter Anne Marie Helmenstine, Ph.D. Updated July 08, 2019 You might be surprised by all the reasons that someone would drink their own or another person's urine. But is it safe? That depends on a few factors. Reasons People Drink Urine Ingesting urine, or urophagia, is a practice dating back to ancient man. Reasons for drinking urine include attempted survival, ceremonial purposes, sexual practices, and alternative medicine. Medical reasons include teeth whitening, fertility treatments, hormone therapy, and prevention or treatment of cancer, arthritis, allergies, and other diseases. Is Drinking Urine Safe? Drinking a small amount of urine, particularly your own, isn't likely to be significantly hazardous to your health, but there are risks associated with drinking urine: Bacterial Contamination While it's unlikely you could catch a disease you didn't already have from your own urine, pathogens in urine or from the lining of the urethra could pose a health risk to others. High Mineral Content Urine is excreted from the body, so it makes sense that the salt and minerals aren't something you need to put right back into your system. Urine is high in urea, sodium, potassium, and creatinine. If you are hydrated, these minerals won't harm you, but they can put stress on your kidneys if you don't have enough water in your blood to filter out the excess. Potential Drug Exposure Some drugs and their metabolites are excreted in urine, so drinking the urine from someone on medication could purposely or inadvertently dose the recipient. In some cultures, drinking the urine of a person who has ingested a drug is a way for others to experience the effects. Otherwise, urophagia could medicate a person who does not want or possibly cannot tolerate the drug or metabolite. In addition to drugs, trace amounts of hormones also are found in urine. Is Urine Sterile? Many people, including doctors and nurses, erroneously believe urine is sterile. This is because the "negative" test for bacteria in urine, developed by Edward Cass in the 1950s, sets a limit of allowable bacteria to help health professionals distinguish between normal flora and an infection. The test involves capturing midstream urine, or urine collected after a small amount of urination has flushed the urethra. A negative bacteria test for urine is any number less than 100,000 colony-forming bacteria per milliliter of urine, which is far from sterile. While all urine contains bacteria, the number and types of bacteria are different in a person with an infection. One argument against drinking urine is that bacteria from a healthy person may be fine in the urinary tract, yet infectious if ingested. Don't Drink Urine If You're Dehydrated So, if you were dying of thirst, would it be OK to drink your own urine? Unfortunately, the answer is no. Drinking any liquid, including urine, may relieve the immediate sensation of thirst, but the sodium and other minerals in urine would make you more dehydrated, in much the same way as drinking sea water would. Some people drank their own urine in extreme survival situations and lived to tell the tale, but even the U.S. military advises personnel against it. In a survival situation, you can use your urine as a source of water by distilling it. The same technique can be used to purify water from perspiration or sea water.