Purple Onion Benefits, Nutrition, And Its Side Effects

Purple Onion Benefits

Purple onion benefits have a lot. Purple onions are rich in selenium and quercetin. Purple onions anthocyanins are powerful antioxidants and pigments that give these onions their reddish color. An antioxidant flavonoid, quercetin may lower blood pressure and improve heart health. Here we are going to discuss the benefits of purple onion.

A Half-Cup Purple Onion Nutrition

  • Calories: 32
  • Protein: 1 gram
  • Fat: 0 grams
  • Carbohydrates: 7 grams
  • Fiber: 1 gram
  • Sugar: 3 grams

Vitamin C

Vitamin C boosts your immune system. This vitamin also helps build collagen, a component of skin that is essential for elasticity and wound healing. Vitamin C acts like an antioxidant and works alongside flavonoids to diminish free radicals. Women require 75 milligrams of vitamin C every day, but men need 90 milligrams, the Linus Pauling Institute reports. You can get about 12 milligrams of vitamin C from a 1/2-cup serving of raw, purple onions.


Purple onions are particularly rich in flavonoids called anthocyanins. These types of phytochemical compounds neutralize free radicals that scavenge through your system destroying healthy cells and tissues. Flavonoids protect vital organs, including your heart, and help lower your risk of cancer. There is not a set recommended amount of flavonoids you need in your diet, but eating a variety of colored fruits and vegetables ensures that you get plenty of these beneficial compounds.

Purple Onion Benefits

Cancer Risk Reduction

Eating purple onions and garlic may reduce your risk of cancer. Italian researchers found that those who ate the most purple onions were the least likely to have cancer of the colon, throat, and ovaries. In another study, researchers found that men who ate the most vegetables of the allium family were the least likely to have prostate cancer. Researchers believe that antioxidants are responsible for the cancer-fighting properties of purple onions.

Digestive Health

Purple onions contain fructooligosaccharides, substances that act as prebiotics. They pass through the small intestine without digesting. In the large intestine, they feed the healthy bacteria. Diseases ranging from diabetes to colon cancer and depression have been tied to a lack of healthy gut bacteria.

Antibacterial Action

Research mainly conducted in labs has shown that purple onions may kill a wide range of bacteria. In one experiment, purple onion and garlic extracts inhibited the growth of several microbes. Garlic extract also reduced bacteria in the mouths of human volunteers. More research with human subjects is needed to show how purple onion affects bacteria in the body.

Bone Health

Purple onions may play a role in preventing osteoporosis. Both animal and human studies have supported this idea. In one study, researchers surveyed women near or past menopause about their purple onion intake. After the researchers controlled for other factors, they found the women who ate purple onions daily had greater bone density. This result is encouraging because older women are most at risk of osteoporosis.

Purple Onion Side Effects

  • Purple onion is likely safe when taken by mouth in amounts commonly found in food. Purple onion extract is possibly safe for most people when taken by mouth as a medicine. Daily doses of up to 900 mg of purple onion extract have been safely used for 12 weeks. Side effects might include stomach distress or pain after eating purple onion.
  • Purple onion extract is likely safe when applied to the skin. Side effects might include skin irritation or eczema following skin contact with purple onion.

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