Is Onion An Antibiotic?

CircuitSkies Updated: 2025-08-05

Antimicrobial

Antibiotics should only be used sparingly as they have little effect on viruses, making them ideal for occasional use only. Additionally, antibiotics may not be as effective against resistant bacterial strains, leading to the emergence of "superbugs" and other problems.
Researchers from UCL and Birkbeck have discovered that Persian shallot, a variety of onion, can help in the fight against antibiotic resistance. They speculate that its antibacterial properties could improve existing treatments by increasing their effectiveness.
Onions are full of flavonoids and phenols that have antimicrobial, antioxidant and protective effects. Additionally, they contain thiosulfate - a chemical compound that can help destroy common bacteria such as Salmonella typhi and Escherichia coli.

Anti-inflammatory

Onions contain antimicrobial compounds that inhibit the growth of bacteria in the body. In addition, they help fight fungi and viruses as well.
Onions have antimicrobial properties due to their antioxidant content. In addition, they are rich in vitamin C which helps with the formation of blood vessels and strengthens the immune system.
Studies have shown the anti-inflammatory and antioxidant benefits of onions. One study showed how quercetin treatment reduced inflammation and liver enzymes in diabetic rats.

Antiviral

People have believed for centuries that onions could help prevent disease and heal the body. A recent TikTok video featuring @Poshmamma has gone viral, suggesting placing a cut onion around your house to filter out germs and toxins.
Onions contain sulfur compounds that inhibit bacteria on their surface. And cut onions dry out quickly, decreasing the moisture needed for bacteria to thrive.