The onion is a vegetable, whose scientific name is Allium cepa, serves to be used in cooking for its diverse gastronomic qualities , on the other hand, brings incredible health benefits, such as in controlling weight in the treatment of arterial hypertension, in the circulatory system, and even aesthetically, for skin and hair care.

Its crops are widely distributed throughout the world, in countries such as China, India, USA, Turkey, Russia, Argentina, Spain, Mexico, Venezuela, among others. It is a long-lasting, low-cost vegetable and can be harvested throughout the year, in spring, winter and summer.

What are the benefits of onion?

The qualities of onion have been known for many years, even centuries, it is recognized to be used therapeutically, to treat various health ailments and even its contribution to aesthetics and beauty.

Onion when Consumed Raw

Consuming raw onion can promote digestion and the functions of the pancreas, liver and gallbladder. In addition, it can also help us fight infectious diseases by being highly antiseptic, its usefulness is recognized to prevent urinary tract infections and tuberculosis.

Using onion on the face

The onion represents a great benefit for skin care, because it is extremely rich in vitamin C (antioxidant), responsible for the reconstruction of collagen.

Its application on the skin can help fight cases of acne, dermatitis, warts and bites. As well as helping to maintain the cleanliness of it.

What is onion used for in hair?

The onion helps in hair care, especially in cases of dandruff, hair loss and irritation of the scalp. As already mentioned, its action on collagen gives it these properties.

Onion in Sexuality

The aphrodisiac properties of onion have been known for a long time, especially in its usefulness to increase desire, both in women and in men, in addition to influencing the increase in sexual performance.

Onion for cancer treatment

The onion, due to its multiple qualities, represents a great benefit to human health, especially in diseases such as cancer.

The organo-sulfur components that this vegetable has, favor the prevention and growth of tumors, especially in the stomach, esophagus, colon and prostate.

For depression consume onion

The onion also has components that can influence people’s mood, sleep and appetite, such as folate, which is known to contribute to the prevention of depression.

Onion promotes circulation

Thanks to the fact that it has a very important antioxidant flavonoid, quercetin, it favors blood circulation and can help lower blood cholesterol levels, preventing coronary thrombosis.

Onion helps prevent anemia

The onion helps the regeneration of red blood cells and prevents blood loss. In addition, it has significant concentrations of vitamin E, iron and phosphorus, which favor the prevention of this disease.

Proven that the onion favors the control of hypertension and fluid retention

It reduces the risk of suffering from hypertension, it also improves the work of the prostate and kidneys. Due to its properties as a diuretic, it prevents the formation of stones. It has high concentrations of potassium, but low sodium, improving the work of the prostate and kidneys.

Onion helps in weight control

This vegetable can increase the feeling of satiety so it is very useful when losing weight. In addition, it is rich in fiber and has a low caloric concentration, ideal for most diets.

What are the healing properties of onion?

90% of the onion’s composition is water, which is surprising that in only the remaining 10% there are so many nutrients and beneficial properties:

  • It has amino acids and fiber.
  • Minerals such as potassium, magnesium, sodium, sulfur, calcium, phosphorus, among others.
  • Vitamins C, E and complex B.
  • Essential oils.

All these compounds achieve the contribution of their properties, among these:


Due to the presence of quercentin and vitamin C, the onion has antioxidant properties. It also has concentrations of Vitamin A, sulfur and anthocyanin, which contribute in the same way to this property.


It serves as a natural treatment for patients with gout, kidney failure, kidney stones, edema.


Its use is useful in processes of colds, bronchitis, asthma, pharyngitis, allergies and other respiratory conditions.

Bactericidal and fungicidal

Its use is recommended to alleviate mild infectious processes, since it can attack certain types of bacteria and germs.


Its use is useful to lower cholesterol and triglyceride levels, it is highly recommended for hypertensive patients.

Types of Onions

There are different varieties of onion, these have different qualities and can be used in different ways.

Very few people know about this diversity, here are some of the existing types of onion:

Spring onion

These are long and thin, white in color and the bulb has a slight thickening. Its flavor is milder and sweeter than that of the common onion and its green stem can also be used in cooking.

Spring onions

It is very similar to chives in appearance, but with an even milder taste. They can be white, yellow, or red. However, when eaten raw they can taste spicy.

Yellow onion

This is the onion with the most use in the kitchen because of its particular flavor, which is not so strong. It has a not very large sphere shape (about the size of a baseball), a yellow color with a skin-colored cover and with a paper appearance.

White onion

It is usually confused with the yellow onion due to its similar appearance, however, its flavor is much sweeter and the color of its skin is bright white.

Red onion

Its flavor is spicier and has a harsher texture. It is also known as purple onion, its shades vary from purple to dark red, its size is similar to that of white and yellow onions.


The shallot has a small and elongated shape, however, different sizes and shapes can be found. This type of onion has a white color with shades of purple, a pleasant aroma, a slightly strong flavor, but not as strong as that of the red onion and is widely used in French and Asian cuisine.


Leeks are often confused with chives, but they have a very fibrous texture and a very sweet taste. Leeks are long, elongated and white in color.

Disadvantages of onion

Despite the fact that onion has various benefits and qualities, it can also have some disadvantages or side effects:

  • Blood sugar reduction: This vegetable can cause a drastic drop in blood sugar levels, which can lead to serious problems for diabetics.
  • Skin irritation: when applying the various recipes that exist with onion on the skin or scalp, certain types of allergies, irritations or rashes can be generated.
  • Acidity: excessive consumption of onion can generate acidity.
  • Bad breath: as the onion has a high concentration of sulfur, it can generate bad breath in people when consumed.
  • Upset stomach: can cause negative effects on the digestion process, either due to excessive consumption or due to people’s conditions.
  • Reduction of the coagulation process: by having anticoagulant properties, the onion can generate excess bleeding or the appearance of bruises.

How to consume the Onion?

There are a variety of ways to consume onion, where the creativity of each person will help to combine it and develop new recipes.

  • It can be consumed in salads, where it is generally used raw.
  • In soups: using meat broth as a base, with croutons of bread and bathed with cheese, put to gratin, it is a true delight.
  • Used in dressings and sauces.
  • Making them caramelized is a very common way to consume them, which adds a sweet touch. These caramelized onions can be added to hamburgers, sandwiches, and more.
  • In rings, breaded generally used as an aperitif or a side dish.

Homemade uses of onion

Knowing the benefits and properties, there are some recipes or home remedies with onion that can take advantage of its advantages, among these we have:

  • To lose weight: There is an easy-to-prepare broth useful in this regard, which can be taken before each meal. In this broth, two onions, celery, two cloves of garlic and three leeks are boiled, then left to cool and strain.
  • For hair and skin: An onion can be liquefied and then applied to affected areas of the skin or hair. This can be done several times a week. Also to stimulate hair growth, you can put a chopped onion in the shampoo and let it rest for a day in the fridge, then you can use this product on a regular basis.
  • To promote blood circulation: it is recommended to include raw onion regularly in the diet.
  • As an antibiotic: You can mix two chopped onions, several tablespoons of honey and lemon juice, then let it rest in the fridge for a day. Every two hours you can ingest two tablespoons of this mixture.

Some facts about onion

The onion is a bulb, this structure has its growth under the ground. The bulbs serve to accumulate reserve substances. It does so through its leaves, which are called cataphiles.

The onion has its origin in Asia, today it is cultivated worldwide. In ancient times, due to its rounded shape, it was associated with eternal life.

Have you ever wondered why we cry when we cut onions?

This annoying effect is due to the fact that inside the onion there are substances that have sulfur, when we cut them they react and spread in the air.

Upon reaching our eyes, they are transformed into sulfuric acid, even in very low concentrations, this gives us that burning sensation, to which our eyes react with the production of tears to minimize this reaction.


To conclude, it is important to remember that despite all its benefits, it should not be consumed in excess, for everything there must be a balance, even if it is a very beneficial natural product, its abuse can cause stomach or other conditions, such as those mentioned among its disadvantages.

The onion, like all other vegetables and greens, presents an ideal season for planting and harvesting. This season is during the summer, between the months of June and September.

Samantha Robson
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Dr. Samantha Robson ( CRN: 0510146-5) is a nutritionist and website content reviewer related to her area of ​​expertise. With a postgraduate degree in Nutrition from The University of Arizona, she is a specialist in Sports Nutrition from Oxford University and is also a member of the International Society of Sports Nutrition.

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