Onions are high in vitamin C, which may help regulate your immune health, collagen production, and iron absorption. It’s also a powerful antioxidant that could help protect your cells from unstable, damaging molecules called free radicals. Onions are rich in B vitamins, including folate and vitamin B6.
Onions contain many antioxidants and sulfur-containing compounds. They have been linked to a reduced risk of cancer, lower blood sugar levels, and improved bone health. Onions (Allium cepa) are bulb-shaped vegetables that grow underground.
When an onion is sliced or diced, the onion’s cells release these compounds into the air. When this occurs, “enzyme” works to alter the amino acids into lachrymator compounds. This form of sulfuric acid irritates the nerves around the eyes making them tear.