Asparagus

Studies in people

• Benefit

  Sleep quality in shift workers⁵

  Nurses on shift work who took asparagus extract regularly reported better sleep and less fatigue.

• Benefit

  Stress and sleep⁷

  In men, asparagus extract seemed to steady stress hormones and may help sleep, but studies were small and short.

Animal and lab studies only

• Open question

  Gut bacteria health⁹

  Asparagus polysaccharides may feed gut bacteria, but most studies so far are in animals or lab dishes.

• Benefit

  Cancer-fighting compounds¹⁰

  In lab and animal studies, asparagus saponins had anti-cancer effects, but the authors say more research is needed.

• Benefit

  Gut inflammation¹¹

  In lab studies, asparagus powder helped gut bacteria release antioxidants that protected cells from damage and inflammation.

Found in some samples or products

These come from where it was grown, how it was processed or cooked, or what it was made into. They are not about the ingredient itself, so the signal does not count them.

• Eating contaminated vegetables⁸

  Asparagus can carry heavy metals like lead and arsenic, and eating it often may pose a health risk.

Single cases of misuse or overdose

One person or one incident, such as an accidental overdose or a mistake in a kitchen or factory. They are real, but a single case does not show what happens at normal amounts, so the signal does not count them.

• Food poisoning from home preserves⁶

  A man got botulism after eating home-preserved asparagus, and needed a machine to help him breathe.

How it’s made and used

• Urine smell after eating²

  Asparagus contains asparagusic acid, which may be why your pee smells odd after eating it.

• Smelly pee after eating³

  In people who ate asparagus, two compounds appeared in their urine and seemed to cause the smell.

• Smelly urine after eating⁴

  In some people, eating asparagus makes pee smell strong because of sulphur compounds.

The signal at the top counts the findings in people and in animal and lab studies. A concern in studies of people outranks animal and lab studies, and “No concerns” needs at least one finding in people. When most findings in people point one way, the page leans that way (“Mostly”), and every finding is still shown. Findings whose study type is not stated are shown but not counted. This page is a reference, not medical advice. It describes what regulators and published research say. Talk to a doctor or dietitian about your own diet.