Composed by Ariane Lang, BSc, MBA on December 23, 2019-- Clinically examined by Jillian Kubala, MS, RD, Nourishment

You might have seen that after consuming asparagus, your pee has a rather undesirable aroma.

This generally occurs because of the metabolic rate of asparagusic acid, and also the idea is described as asparagus pee.

Nevertheless, this specific adverse effects of consuming asparagus does not take place to everybody, as well as some might have never ever scented something.

This short article clarifies why consuming asparagus makes pee scent, as well as why just some individuals can scent it.

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Asparagusic acid is a sulfur-containing substance that appears to be located solely in asparagus.

It's a safe compound that creates a sulfurous smell, which some state resembles rotten cabbage.

Considering that a poignant as well as solid odor defines several sulfur-containing elements, such as rotten eggs, gas, or skunk spray, researchers think that asparagusic acid might be the root cause of your pee's amusing fragrance after consuming the veggie (1, 2).


Asparagusic acid is a harmless, sulfur-containing substance that might create your pee to have an unique smell after consuming asparagus.

Exactly how does it influence pee scent?

As soon as your body metabolizes asparagusic acid, it generates a number of sulfurous by-products that are very unpredictable-- significance that they evaporate conveniently (3 ).

When you pee, these substances vaporize nearly quickly, which allows them to take a trip from the pee approximately your nose, permitting you to scent them.

Though researchers have actually not had the ability to identify whether one substance is in charge of the odor or if it is because of the mix of every one of them, a substance called methanethiol is extensively discussed in the literary works.

Methanethiol, likewise called methyl mercaptan, is identified by a undesirable as well as solid fragrance that's frequently connected with fecal smell as well as foul-smelling breath-- and also it occurs to be one of the most typical odorant discovered in pee after consuming asparagus (4, 5, 6).

For how long does the scent last?

Some individuals see the rotten-like scent as very early as 15-- thirty minutes after consuming asparagus, as well as research studies have actually established that within 25 mins, fifty percent of the asparagusic acid taken in has actually currently been taken in (7 ).

The quick absorption price recommends that the impact of asparagus on pee scent can show up rather swiftly, as well as current research studies likewise concur that it can last for greater than a couple of hrs.

One research in 87 individuals that consumed 3-- 9 spears of asparagus discovered that the half-life of the asparagus scent was 4-- 5 hrs (3 ).

The half-life of a compound informs you the length of time it considers it to decrease to fifty percent of its first quantity. Consequently, if the half-life of the asparagus scent was approximated at 4-- 5 hrs, it indicates that the overall result might last approximately 8-- 10 hrs.

Yet, one more research study in 139 individuals that likewise taken in 3-- 9 asparagus spears reported the half-life of the odor to be 7 hrs, implying that the result might also last as much as 14 hrs (7 ).

In any case, you can anticipate your pee to scent for a long time.


When your body metabolizes asparagusic acid, it creates many stinky, sulfur-based substances that provide your pee a rotten-like scent that can last 8-- 14 hrs.

The result of asparagus on pee fragrance is not global, and also a variety of theories attempt to clarify this sensation.

One theory-- called the manufacturing theory-- recommends that just some people can creating the sulfurous substances in charge of the scent, while others are non-producers.

This theory insists that non-producers do not have a crucial enzyme that assists metabolize asparagusic acid and also are therefore not able to create the stinky results (4 ).

As an example, a tiny research in 38 grownups figured out that concerning 8% of them either really did not generate the odor or created it at focus that were also reduced to be spotted (4 ).

The various other theory-- called the assumption theory-- states that everybody generates the odor, yet some are not able to find or regard it (4 ).

In this instance, scientists located a genetic engineering that modifies several of the olfactory receptors that must reply to the asparagus odor, creating what is referred to as asparagus anosmia, or the lack of ability to scent asparagus pee (8 ).

Actually, research study recommends that a huge percent of individuals can not scent asparagus pee.

One research in 6,909 grownups kept in mind that 58% of males and also 62% of ladies had asparagus anosmia, recommending that this details genetic engineering is fairly typical (8 ).


Not every person recognizes with asparagus pee, and also scientists think that it's due to the fact that some individuals either do not generate the odor or are incapable to view it.