Asparagus and Urine Odor

This is part of our Fun With Pee series. Funny, curious, and even startling facts and stories about the pee our bodies make.

Will Eating Asparagus Give Your Pee a Strong Urine Odor?

Perhaps you’ve heard it claimed many times before. Asparagus makes your urine smell bad, but is that claim true? In a word… Yes. Well, bad is a subjective term. It makes your urine odor a lot stronger at the very least. Asparagus can also cause dark yellow urine. Why does this happen? When you eat asparagus the vegetable breaks down. The vitamins and minerals enter your urine and eventually exit your body in your pee. There are some sulfuric elements in asparagus that may be causing the the strong urine odor and darker urine color. After eating asparagus, your pee will smell pretty quickly, usually within 30 minutes of eating the green stalks. The effect doesn’t last too long, and usually goes away after your first or second urination post munching on asparagus.

Does Cooking the Asparagus Make the Urine Odor Strong?

People enjoy eating asparagus prepared in many different ways, but whether your asparagus is fresh or cooked, it will still cause the strong odor. There are, perhaps, some ways to prepare asparagus that could create a stronger or milder urine odor depending on the other foods, spices, etc you may use. Which foods or spices?

Well, that’s harder to determine. Part of the challenge here is the evidence is mostly anecdotal. Do you have a way to measure how strong you urine smells after eating asparagus prepared in different ways? Now, it could be possible to conduct a urine test using samples taken after eating the raw and cooked asparagus, but most urine tests are not designed today to test specifically for the differences in minerals and chemicals that accompany asparagus in urine. Perhaps more importantly, the conditions that would be required for an unbiased urine sample would need to be very strict to rule out any other factors that may introduce similar chemicals in your urine. But, if you have some experience with asparagus preparation that either intensifies or decreases the strength of the urine odor, please let us know.

Not Everyone Thinks that Asparagus Makes Your Pee Smell. The really interesting thing is many people can’t physically smell the odor that asparagus causes. Actually, only about 40% of people have the genes to smell this odor! That’s why some people think you’re crazy when you tell them that asparagus will make your pee smell funny. There’s another theory as well, and that is that certain people don’t have the same physical reaction with asparagus as those who experience a strong urine odor. So, why hasn’t science nailed this down? Some scientists may find it difficult to receive research grants for stinky pee, especially when there’s is no known danger from eating asparagus other than a pungent odor. That’s why you will usually hear theories rather than case studies. But if you want to run your own tests and let us know, we would be happy to hear the results. Just to don’t expect your friends to be too excited when you offer to cook asparagus for them and then smell each other’s urine.


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Red Urine

Clear Urine

Orange Urine

Blue Urine

Black Urine

Green Urine

Light Yellow Urine

Dark Yellow Urine