Last updated: August 9, 2021

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Welcome to our big grapefruit seed extract test 2022. Here we present all the grapefruit seed extracts that we have tested in detail. We would like to make your purchase decision easier and help you find the best grapefruit seed extract for you.

You will also find answers to frequently asked questions in our guide. Furthermore, you will also find some important information on this page that you should be aware of if you want to buy grapefruit seed extract.


  • Grapefruit seed extract is, as the name suggests, an extract obtained from the seeds of the grapefruit. The grapefruit seeds themselves are often considered waste products from the processing of the fruit.
  • The extract itself is used for numerous medicinal purposes. The reason for this is the assumption that the substance can be used against a variety of diseases. One example of this is candidiasis.
  • In addition, a large number of studies exist concerning the positive effect of the extract against certain diseases. In addition, these studies support numerous testimonials.

The Best Grapefruit Seed Extract: Our Picks

Guide: Questions you should ask yourself before buying grapefruit seed extract

What is grapefruit seed extract?

Grapefruit seed extract is an extract obtained from the seeds of the grapefruit, also called Adam's apple or paradise apple. The seeds are actually considered a kind of waste product during the processing of the fruit. The seeds themselves are extracted with the help of certain extracting agents and then ground.

Even though the seeds are understandably the main ingredient used in the production of grapefruit seed extract, the flesh of the fruit also offers many health benefits. (Image source: / Jill Wellington)

In addition, it is also extracted from the skin of the fruit.

What ingredients are contained in grapefruit seed extract?

The extract itself has a high content of vitamin C, as well as a number of secondary plant compounds, so-called flavonoids. Strictly speaking, grapefruit seed extract consists of three components; the bioflavonoids, the limonoids and the glycosides.

Bioflavonoids These are plant substances that used to be called vitamin P and have a healing effect. They are also able to form antibodies and effectively fight viruses, bacteria and fungi. For this reason, grapefruit seed extract is said to have an antibacterial effect.

  • Naringin
  • Limonin
  • Rutin
  • Kämpferol
  • Poncirin
  • Hesperidin
  • Quercetin

Limonoids These give the fruit a bitter taste and can also prevent parasites from feeding, reproducing and growing.

Glycosides Glycosides are a compound of flavonoids and various sugars found in the fruit. On the one hand, they contribute to a bitter aftertaste, while they also have a high concentration of vitamin C.

  • Dihydrokaempferol
  • Quercetin
  • Neohesperidin
  • Kaempferol
  • Isosacuranetin
  • Hesperidin
  • Naringin
  • Poncirin

What effect does grapefruit seed extract have on the body?

As already mentioned, the extract has an antibacterial and antimicrobial effect. The fungicidal effect is particularly noteworthy here. The fruit flesh alone is already considered particularly beneficial to health, which is due to the high vitamin C content, among other things.

However, the seeds are particularly interesting because they have a protective effect against bacteria, fungi and parasites.

Basically, the extract is used against numerous physical problems.

Grapefruit seed extract against pancreatiti

Grapefruit seed extract shows a protective effect in the case of pancreatitis. In a study published in the Journal of Physiology and Pharmacology, Polish researchers have made significant findings. According to the experts, the substance is able to effectively prevent inflammation-related changes in the pancreatic tissue.

The reason for this is said to be the flavonoid naringenin. This is an antioxidant plant substance that is responsible for the bitter taste of the fruit. It is also contained in the seeds and peel. The extract is also effective against a number of psychological problems, such as chronic fatigue. In addition, the immune system is stimulated. This in turn can help in the fight against diseases such as AIDS.

Grapefruit seed extract against warts

Warts are generally perceived as extremely ugly and are therefore detested by most people. However, they are not a disease in the classical sense, but rather a kind of growth on the surface of the skin. As a rule, they have a grey, brown or pink colour. Not only do they look ugly, but they also have the potential to spread quickly over the whole body.

They are also highly contagious. However, since warts are caused by viruses, they can also be fought with active substances that have antiviral properties. Grapefruit seed extract is one of these active ingredients. The substance is applied directly to the wart. In the case of undiluted application, the extract should be drizzled on the affected areas three times a day on a daily basis. An alternative is a foot or hand bath, in which the hands or feet are bathed for a few minutes. Then 15 drops of the extract are added to the bath water.

However, this alternative is only suitable for small-scale, light infestations. At the beginning, the application should be carried out on three consecutive days. Subsequently, an application every two to three days a week is recommended for a period of two to three weeks. If the feet are infested, it is also advisable to wash the socks with the extract.

Grapefruit seed extract against other diseases

Grapefruit seed extract can be used to combat numerous diseases. It is important to use the active ingredient correctly. The following are some diseases for which the extract can help.

  • Rhinitis: Grapefruit nasal spray is a good choice for rhinitis. This should be used three times a day. In addition, the conventional intake of grapefruit seed extract is recommended to achieve the maximum effect.
  • Dandruff and itchy scalp: In this case, five to ten drops of the extract should be added to the shampoo and then massaged onto the scalp. The process should take about two minutes. This is followed by rinsing.
  • Blemished skin and acne: First, the face should be moistened with water. Then a drop of the extract is spread into the hands and massaged evenly onto the face. Then the active ingredient should be given some time to take effect. Afterwards, the face should be dried again.
  • Nail and foot fungus: At the beginning, the nails should be treated about every three to four days. In the further course, it makes sense to treat them every three to four months. When washing socks and the like, it is advisable to add about 20 drops of the extract to the last rinse water. This can prevent a new infection.
  • Sweaty feet: For sweaty feet, between 30 and 50 drops can be added to a bowl of warm water. Make sure that the water reaches the ankles. The feet themselves should be bathed in the water for about five to ten minutes. It is also important to dry the feet properly after the foot bath.
  • Gastrointestinal diseases
  • Yeast infections
  • Bacterial infections
  • Respiratory diseases
  • Herpes
  • Vaginal infections

How should grapefruit seed extract be used?

As a newcomer, a low dose is advisable at the beginning. With the extract, for example, a dosage of one to three drops on a daily basis is worthwhile. These can either be taken directly on the tongue or added to any beverage.

The target is about three to 15 drops taken throughout the day. If side effects occur during the intake phase, it is advisable to lower the dose again.

In addition, plenty of water should be drunk so that the elimination of dying bacteria or fungi and their toxins is supported and accelerated. The dose itself should be kept for a few days and then increased. The highest dose, in turn, should be maintained until the respective symptoms subside. It should be noted that between 250 and 500 ml of water should be taken during the intake.

Important: In rare cases, a healing crisis can occur, which is also known as a Herxheimer reaction. By taking the substance, a large number of pathogens such as bacteria or fungi can die off in a short time. The result is a release of large amounts of toxins. These can burden the body and possibly overload it. Detoxification symptoms such as mild indisposition, digestive complaints, headaches and fatigue may occur.

Decision: What types of grapefruit seed extract are there and which is the right one for you?

Basically, you can distinguish between three different types / kinds of grapefruit seed extract:

  • Tablets
  • Capsules
  • Drops

What are grapefruit seed extract tablets and what are the advantages and disadvantages?

Grapefruit seed extract tablets are taken orally and are also suitable for on-the-go use. The products differ in dosage and additives such as corn syrup.

  • Suitable for on the go
  • Can also be taken in combination with drinks
  • Fast effect
  • Product variety is manageable
  • Individual dosage possible to a limited extent

What is grapefruit seed extract capsules and what are the advantages and disadvantages?

Grapefruit seed extract capsules must be taken in combination with liquid. The extract is inside the capsule shell. This consists of gelatine, so vegetarians and vegans should check its origin and composition before buying. Since the capsule shell only dissolves in the stomach, the effect is delayed.

  • Wide variety of products
  • many products contain no by-products
  • neutral taste
  • Individual dosage possible to a limited extent
  • delayed onset of effect

What is grapefruit seed extract drops and what are the advantages and disadvantages?

Grapefruit seed extract drops can be taken directly on the tongue. Alternatively, they can be taken in combination with a drink of your choice. In addition, the dosage can be individually adjusted. The variety of products offers the customer a wide choice.

  • Many products contain no by-products
  • individual dosage possible
  • Unsuitable for on the go

Buying criteria: You can use these factors to compare and evaluate grapefruit seed extracts

In the following we would like to show you which factors you can use to compare and evaluate grapefruit seed extracts. This will make it easier for you to decide whether a particular grapefruit seed extract is suitable for you or not. In summary, these are:

  • Dosage
  • Dosage form


The dosage provides information about how large the proportion of the extract is in relation to the quantity. In principle, the higher the dosage, the greater the effect. However, attention should also be paid to what dose is needed per day.

This is especially true for tablets and capsules, as they have a certain dose per capsule/tablet that cannot be changed. Therefore, as a rule of thumb, the sum of the dosages of the capsules/tablets per day should correspond to the recommended daily dose. Otherwise, the higher the dose, the fewer tablets/capsules are necessary.

Dosage form

A product that can be consumed quickly and easily is ideal for people on the go. For this reason, tablets are an excellent choice. They are usually put into a drink, which is then consumed. However, direct absorption via the tongue is also possible.

Capsules, on the other hand, are tasteless, so they are ideal for people who want to benefit from the effect of the substance, but otherwise want to do without the taste. In addition, they can be taken in one go in combination with a liquid, so that they are characterised by an extremely fast and uncomplicated intake.

Drops have the advantage that they can be dosed individually. This means that they can be taken very precisely and easily.

Especially for longer periods of time, for example a few months, where a gradual and precise dosage is important, drops can prove to be quite advantageous.

Facts worth knowing about grapefruit seed extract

What effect does grapefruit seed extract have on our blood vessels?

The already mentioned active ingredient naringenin might be able to protect against metabolic syndrome, according to some researchers. This syndrome includes the four most common complaints of civilisation; high blood lipid levels, high blood pressure, obesity and insulin resistance. The substance helps to seal vessel walls and at the same time maintain elasticity. It is also able to reduce micro-deposits.

Other positive aspects of naringenin include the promotion of the breakdown of red blood cells, as well as the normalisation of the haematocrit value. Another flavonoid found in the extract is called hesperidin and has a positive effect on the cardiovascular system.

The reason for this is, for example, an improvement in the function of the capillaries, which incidentally leads to a reduction in increased blood pressure. In addition, the substance has a positive effect on the veins, so that it can have a protective effect on vein problems.

Grapefruit seed extract and Helicobacter pylori

A Polish study from 2004 shows that grapefruit seed extract can help with inflammations of the stomach mucosa. The reason for this is the fact that the extract can act against the bacterium called Helicobacter pylori. This bacterium is considered to cause inflammation of the stomach lining (gastritis), but also duodenal and gastric ulcers.

It is also blamed for stomach cancer. An Italian study was also able to show that the growth of these stomach germs can be counteracted through the use of diluted grapefruit seed extract. In direct comparison to conventional antibiotics, which are only effective against bacteria, the extract is also able to fight fungal infections.

What are the advantages of grapefruit seed extract over antibiotics?

According to a study conducted by the University of Texas in 2002, grapefruit seed extract does not have any significant side effects, even when taken in high doses. Moreover, no irritations occur even with prolonged consumption. Consequently, the substance is tolerated by the body without any problems as long as one does not suffer from a citrus fruit allergy. Antibiotics, on the other hand, are known to damage the intestinal flora. However, this is extremely important for a strong immune system.

Consequently, a damaged intestinal flora favours fungal infections. The reason for this is the fact that a healthy intestinal flora also means a strong body's own defences. In summary, it can be said that a high dosage is not accompanied by significant side effects and also has a positive effect on the intestinal flora, which is known to play a decisive role for a strong immune system.

In addition, the flavonoids of the extract stimulate the immune defence, resulting in an increased production of antibodies. These in turn are an important factor in the fight against dangerous bacteria, fungi and viruses.

Image source: / Couleur