Grapefruit seed extract sounds a bit exotic, but it really isn't.This is a purely herbal active ingredient that is obtained from the seeds and sometimes also from the peel of the grapefruit.This extract is said to have numerous positive properties and effects.Of course, these promises made us curious.We wanted to know from our own experience what was behind it.Are the effects of the extract really that good, or are these just unfounded advertising promises from the manufacturers?Therefore, it was obvious to conduct a new test.For this test, we selected 10 different preparations with grapefruit extract from different manufacturers.We assessed and compared our test candidates based on selected criteria.In the following guide you will find all the important and interesting information about grapefruit extract and the detailed test results.And of course we will also show you which grapefruit seed extract is really worth the money.Rainbow Circle Grapefruit Seed Extract is a 100% natural antibiotic with a wide range of effects.And, this preparation is the clear test winner in our grapefruit seed extract test.The Rainbow Circle extract is obtained from seeds that come exclusively from controlled organic cultivation.This preparation is characterized by an exceptionally high flavonoid content.The manufacturer recommends its drops to treat fungi and parasites.Used internally, Rainbow Circle extract can strengthen the immune system.The gluten and lactose-free drops are 100% vegan.A maximum daily dose of 3 x 15 drops is recommended for the Rainbow Circle Grapefruit Seed Extract Drops.The drops should be taken with plenty of liquid. 15 drops correspond to 0.8 ml of extract.The manufacturer recommends taking a maximum of 5 drops per 10 kilograms of body weight.The rainbow circle drops are delivered in a glass bottle with a dropper attachment for easy dosing.The bottle content is 100 ml and lasts for about 40 days.During our research, we were only able to find positive reviews for the rainbow circle grapefruit seed extract drops, but no negative reviews or indications of side effects.Effective nature grapefruit seed extract contains an 83 percent extract of high-quality organic grapefruit peel and seeds.According to the manufacturer, the extract is rich in bioflavonoids and a rich source of vitamin C. The extract, which Effectiv nature describes as core power, can be used in a variety of ways.Thanks to the high vitamin C content, the daily requirement for this vitamin can be covered with just a few drops.In addition, this preparation is suitable for mouthwashes, for footbaths and even as a powerful and biodegradable household cleaner.For an adequate daily supply of vitamin C, Effectiv nature recommends taking 15 drops 3 times a day.The drops should be mixed in at least 100 ml of water and consumed.A bottle of Effectiv nature's grapefruit extract contains 50 ml, which is sufficient for around 12 days if the recommended daily dose is consumed.The grapefruit seed extract from Effectiv nature has so far been rated very positively by all users.During our extensive research on this test, we could not find a single negative customer rating.CitroPlus is a very pure and high-quality organic grapefruit seed extract with a high proportion of natural bioflavonoids.The vegan CitroPlus extract is made from 100% organically grown fruits.The most important ingredients of the extract include the secondary plant substances naringin, isonaringin, neohesperidin and many others.These bioflavonoids are dissolved in plant-based organic glycerine, ensuring that this extract is readily available and well tolerated.Overall, the flavonoid content of this extract is 800 mg per 100 ml. CitroPlus recommends the daily consumption of 3 x 15 drops with plenty of liquid.A bottle of extract contains 50 ml, so that a supply of about 12 days is ensured.For the CitroPlus grapefruit seed extract we have not been able to find any negative reviews regarding the effect or tolerability.As soon as we find corresponding customer reviews, we will publish them here.It is rare that we examine 2 preparations from one manufacturer in our tests.However, the second Effectiv nature extract from grapefruit differs from the preparation in second place in a few important points.This extract is 40 percent.In addition, the bottle has a pipette for easy dosing, which is missing with the other Effectiveiv nature extract.According to the manufacturer, this extract is only made from seeds and not additionally from the shells.It is suitable for mouthwashes, skin disinfection and as a biodegradable household cleaner.In addition, this extract contains 50 mg of vitamin C per daily dose. Preservatives or other unnecessary ingredients are not included.Effectiv nature recommends taking 15 drops of this grapefruit seed extract with plenty of liquid.The drops should be taken in 3 x 5 divided doses throughout the day.One bottle contains 50 ml of extract, which is enough for about 35 days.This grapefruit seed extract from Effective nature has only received positive reviews so far.We have not been able to find any reports of negative experiences or side effects.We know Biovita food supplements and remedies from numerous of our tests.The manufacturer regularly achieves good results with its products.In this test, the Biovita test candidate came in 5th place and also received a recommendation from us.The Biovita grapefruit seed extract is a very good and effective preparation in capsule form.The capsules contain a highly pure grapefruit extract in a ratio of 1:10.The gently obtained powder is filled into vegan HPMC capsules.Therefore, these Biovita capsules are perfect for vegans.Biovita recommends taking 1 capsule daily with plenty of liquid.1 capsule contains 400 mg grapefruit seed extract.One can contains 120 capsules and lasts for around 4 months if the recommended daily dose is consumed.These Biovita capsules with high-quality grapefruit extract have so far been rated very well by practically all users.Nature Love Organic Grapefruit Extract contains 1200 mg bioflavonoids per 100 ml.The manufacturer promises.The grapefruit seed extract is laboratory tested and certified organic.This means that the ingredients come from controlled organic cultivation.An extract from seeds and skin is used.Conveniently, the manufacturer has packed his preparation in a glass bottle with a pipette made of natural rubber.The pipette makes dosing much easier.Overall, the preparation is lactose-free, gluten-free and free of preservatives.Flavors, colorings and stabilizers are also not included.Nature Love recommends taking 20 drops 3 times a day.In this way, according to the manufacturer, the body is supplied with 30 mg of bioflavonoids per daily dose.One bottle contains 100 ml extract and lasts for about 30 days when consuming the recommended daily dose.With the Nature Love grapefruit seed extract, the buyer ratings are already somewhat different.Only about four out of five are really satisfied.One in five expressed doubts about the effectiveness and complained that the tolerability was not so good.If you order the Vita2You grapefruit seed extract, you will receive a can with 120 capsules.According to the manufacturer, each of these capsules contains 500 mg of a 45 percent grapefruit extract.This corresponds to 225 mg bioflavonoids per capsule.Vita2You says the capsules are made entirely without additives.For better storage and preservation of potency, the capsules are packaged in a Miron glass.This dark glass protects the contents of the can from harmful UV rays.It is recommended to take 1 capsule daily with plenty of liquid.The content of the can is sufficient for 120 days when consuming the recommended daily dose.The Vita2You capsules have only rarely been evaluated, although the preparation has been available for a good four years.Some of the reviews are also negative.BAFOXX Nutrition capsules contain a high-dose extract from grapefruit.The 120 capsules, supplied in a sturdy plastic box, last for 4 months.This extract is a natural product with 45% flavonoids from a pure grapefruit extract.The production takes place in Germany, without the use of superfluous and possibly harmful additives.According to the manufacturer, one capsule contains 300 mg of pure extract, which in turn contains 135 mg of flavonoids per capsule.Manufacturer also promises that its capsules are made without preservatives, magnesium stearate, flavorings and colorings.BAFOXX recommends taking 1 capsule unchewed as a daily dose with plenty of liquid.The content of 120 capsules is sufficient for 120 days or around 4 months.The BAFOXX Nutrition grapefruit seed extract capsules have been available for more than four years.Nevertheless, they have not often been evaluated and probably not bought either.After all, 3 out of 10 buyers are not satisfied with this preparation.The LifeWize organic grapefruit seed extract is highly dosed with 1200 mg of flavonoids per 100 ml.All ingredients are certified organic according to the manufacturer.The extract is produced in Germany without unwanted additives.According to their own statements, the manufacturer takes into account the quality standards according to ISO, HACCP & GMP as well as the strict hygiene guidelines that apply here.According to LifeWize, the vegan extract is free of aromas, colorings, flavor enhancers and preservatives.Also not included are lactose, gluten and genetically modified raw materials.LifeWize recommends taking 3 x 20ml of its Grapefruit Seed Extract daily with plenty of liquid.The extract should be consumed dissolved in water.A bottle with 100 ml content is delivered for about 30 days.Customer reviews for this grapefruit seed extract vary widely.About a quarter are not satisfied and would not recommend this preparation.Vihado grapefruit seed extract capsules contain a natural extract from selected fruits that are organically grown.The manufacturer promises that its capsules are suitable for vegans and are made without artificial additives.Each capsule contains 90 mg of flavonoids from 200 mg of grapefruit extract.The capsules are manufactured in Germany under the strict quality and hygiene regulations that apply here.It is recommended to take 1 capsule daily with plenty of liquid.The contents of the can with 90 capsules are sufficient for 90 days or around 3 months.The Vihado capsules have not been rated very often, but have been rated negatively by many buyers.A striking number of buyers report a lack of effect.Grapefruit seed extract is an all-natural remedy that can be used like an antibiotic.The extract is obtained from the dried and ground grapefruit seeds using a special extraction agent.Depending on the manufacturer, grapefruit peels can also be used.The valuable plant ingredients such as flavonoids and secondary plant substances get into the extract through the extraction.This natural remedy is used for flu infections, gastrointestinal infections, colds, but also eczema and diseases with a skin fungus.Grapefruit Seed Extract has no specific audience.The natural antibiotic is suitable for everyone, whether young or old, man or woman.With this extract, colds, infections and skin diseases can be treated in a completely natural way and quickly alleviated.As a rule, a small amount of extract is enough to achieve a good and quick effect.Our tests are based on carefully selected evaluation criteria that we determine in advance.In order to be able to determine our evaluation criteria, we first research all the information we can find about the test candidates and the active substance.Only when the test criteria have been determined can we begin the test.Below you will find a more detailed description of the evaluation criteria that we used as a basis for this test.In each of our tests with remedies, the effect is given special consideration when evaluating the preparations.In our opinion, the effect is the most important criterion for the selection of a preparation.The grapefruit seed extract works, it is known and proven.How it works in the various preparations, however, is very different.We weighted and considered whether and how a preparation works according to its importance for the overall result.Anyone who buys a preparation with grapefruit seed extract usually does not want a product with numerous other ingredients.Often these ingredients interfere more than they help.Sometimes, however, they can improve the overall effect and tolerability of a preparation.In our test, we analyzed the ingredients of each preparation and took them into account in the overall assessment.A high price does not make a good remedy.We were also able to determine this with the preparations with grapefruit seed extract.Sometimes it's actually the other way around.The cheap preparations sometimes perform significantly better than expensive preparations.The price and in particular the value for money are evaluation criteria that we use in practically all of our tests.We have experienced again and again that effective dietary supplements can also cause a large number of severe side effects.Therefore, in this test with grapefruit seed extract preparations, we also paid attention to which side effects users report and share with interested parties.We get information about side effects almost exclusively from customer reviews.Information about this is only provided in very rare cases on the manufacturer websites or in online shops.Since this point is very important, it was taken into account in the test results of our test subjects.What buyers and users say about a product is always important and interesting to us.From the customer reviews, we were also able to gain a lot of information about preparations with grapefruit seed extract that cannot be found anywhere else.For this reason, customer opinions are among the most important test and evaluation criteria in practically all of our tests.They are weighted and taken into account according to their importance for the overall result.When researching our tests, we always collect experiences that users have had with the products we tested.We have also found and evaluated numerous reports on grapefruit seed extract.Most of these experiences are positive and users would not hesitate to recommend the supplement you have purchased.Others are negative.Some field reports report a lack of effect or severe side effects.We think that it always depends on the respective preparation, its composition and the care taken in processing whether it works or not.Grapefruit seed extract has the same or at least very similar effect as an antibiotic.In fact, this extract can kill viruses, fungi and bacteria.The most important ingredients in this extract are so-called bioflavonoids, special secondary plant substances that can act against harmful germs.These ingredients of the extract attack, among other things, the cell walls of viruses and fungi, rendering them harmless.Depending on what you use the grapefruit seed extract for, the effect occurs after just a few minutes.For example, the itching of a skin fungus disappears very quickly.In the case of athlete's foot or nail fungus, an effect is also quickly apparent.However, to completely eliminate the fungal infestation, longer-term treatment is required.In the case of gastrointestinal complaints, the extract from grapefruit seeds can also have a good effect after just a few minutes.Nobody should really do without a bottle of grapefruit seed extract in the medicine cabinet.The extract has a very good effect, but unlike antibiotics, it does not lead to the formation of resistant bacterial strains.The application is very simple and the effect is lasting but gentle.The preparations are also suitable for children and during pregnancy and can be used externally and, as a rule, internally without any problems.In addition, these preparations are very inexpensive.One of the most common reasons why a remedy like grapefruit seed extract fails to work is that the manufacturer is trying to maximize profits with cheap ingredients.But sometimes it is also due to the combination of ingredients or the manufacturing method that the effect is lacking.Again and again we have to realize that improper storage leads to a reduction in quality and a lack of effect.Grapefruit seed extract is available in 2 dosage forms.You can purchase these supplements in capsule or drop form.In the following sections we will show you the advantages and disadvantages of both forms.Capsules are a very convenient form for a grapefruit seed extract supplement.The capsules are easy to swallow if they are large enough.Equally well, capsule preparations can be taken anywhere and taken when needed.The disadvantage, however, is that the capsules sometimes stick together at high temperatures on warm days.Another disadvantage is that the dosage of capsules can only be increased or decreased in large leaps.Drops have become a very popular form for more and more remedies in recent years.This is also the case with grapefruit seed extract.The liquid extract can be taken as needed.For example, the extract is dripped directly into the mouth or added to a drink and consumed.Another advantage is that with drops, the dosage can be increased in small steps over a longer period of time and can generally be adjusted very individually.In order to find and buy the product with grapefruit seed extract that suits your needs, you should pay attention to a few points when making your selection.We have listed and briefly described the most important selection criteria for you in the following sections.Before you buy a preparation with grapefruit seed extract, you should consider which dosage form - capsules or drops - is best for you.Drops offer you different ways of taking them.However, the strong taste of the preparations is sometimes disturbing.Capsules are very easy to take, they usually taste neutral, but have the disadvantage that you cannot use the preparation externally and fine adjustment of the dosage is not possible.The purity plays an important role in the quality and effect of a preparation with grapefruit seed extract.Therefore, read the package insert of the product you prefer very carefully.Also study the information that the manufacturer has published on its website.Do not reach for any product just because it seems very cheap at first glance.It is often worth spending a few euros more to buy a good and effective product.To assess the tolerability of a preparation with grapefruit seed extract, you must rely on the reviews of other buyers.As a rule, you will only find information about the tolerability of a preparation in the customer reviews either on the manufacturer's website, on Amazon or in an online shop.Take your time to study the customer opinions so that you buy a really good product.Where this preparation was manufactured plays a major role in the quality, effectiveness and tolerability of a preparation with grapefruit seed extract.From our experience, we can always recommend preparations that were made in Germany.The quality requirements and hygiene requirements during production are very high here.For this reason, these preparations are sometimes a bit more expensive than products that were produced in the Far East under questionable conditions.When taking and dosing grapefruit seed extract, you should definitely follow the manufacturer's specifications.In general, it is recommended to increase the dosage over several days.Start with a low dosage, for example with a liquid preparation with 3 x 5 drops daily.Then increase this dosage over the next few days up to the maximum dosage recommended by the manufacturer of, for example, 3 x 15 drops, as with our test winner, the grapefruit seed drops from Regenbogenkreis.A medical examination is usually not required before using grapefruit seed extract.The purely herbal extract is generally very well tolerated and only rarely causes side effects.It is important that the dosage is increased over several days.If you still experience side effects, you should stop taking the drug and if the side effects don't go away, talk to your doctor about it.Grapefruit seed extract can be a sensible alternative to classic antibiotics in many applications.For example, with a stomach flu.This natural antibiotic can also be used very sensibly in the external treatment of skin diseases.The big advantage is that the extract does not cause any resistance in bacteria or viruses and the intestinal flora is protected.Unfortunately, there has not yet been a test in which only preparations with grapefruit seed extract were examined by the testers of Stiftung Warentest.No such tests have been carried out by other test institutes either.However, since we regularly check whether there are new tests from Stiftung Warentest, we will inform you promptly if a test with grapefruit seed extract has been carried out.Since these preparations have become very popular in recent years, you can now buy products with grapefruit seed extract in practically every drugstore from dm or Rossmann.Of course you can also get these products in well-stocked health food stores, in pharmacies and online shops or at Amazon.From our experience, it is recommended to always buy these natural remedies directly from the manufacturer.Here you know what you are buying and the delivery is usually very fast.In addition, you usually enjoy a very generous and accommodating right of return directly from the manufacturer.Depending on the manufacturer, the price of a preparation with grapefruit seed extract can vary significantly.In our test, we found that with a good preparation like our test winner, you have to reckon with a price of around 0.30 euros to a maximum of around 1.60 euros per daily dose.You should be very careful with significantly cheaper offers.But often these are cheap productions from the Far East that don't have the effect you expect.In general, grapefruit seed extract is very well tolerated and has almost no side effects.Symptoms of poisoning can only occur in the case of a really extreme overdose, i.e. the consumption of more than 1 liter of extract.External use can occasionally cause skin redness and itching.If the preparation is washed off the treated area with water, the side effects quickly subside.Since grapefruit seed extract is usually very well tolerated when used externally and internally, there are only a few situations in which use is not recommended.You should refrain from taking the extract if you have to take other medications at the same time.The extract from the grapefruit can lead to unpredictable changes in the effect of the other medication.Sometimes the effect is amplified or even eliminated.Various tests on the effectiveness of grapefruit seed extract have been conducted since the late 1990s.For example, in 2005 it was proven that the extract can protect the gastrointestinal system of rats from damage caused by stress and alcohol.In 2007, the extract was used to protect grapes from fungal infestation.In general, the extract from the grapefruit seems to have an antibacterial and antifungal effect.There are various reasons why grapefruit seed extract is very popular among people.The most important reason is probably that these preparations work well without burdening the stomach and intestines like a pharmaceutical antibiotic.Another reason is the simple and individual dosage.You can.Depending on how you're feeling, you can increase or decrease the dosage as long as you stay within the manufacturer's recommendation.Last but not least, these preparations are very inexpensive compared to medicines.Like other natural remedies and supplements, grapefruit seed extract should be stored in a cool, dry place.It is best to keep it in a cupboard in the original packaging.Under no circumstances should these preparations be left on the windowsill in direct sunlight.Sunlight is never good for preparations of this type.Even if they are packaged in a can that protects them from light and, in particular, from UV radiation.However, storage in the refrigerator is not absolutely necessary.Temperatures that are too low can even damage the preparation.In principle, you can also make grapefruit seed extract yourself.However, the effort is not worth it.For the production of the extract, the seeds are first gently dried.For example in the oven with the door open and circulating air at around 40° Celsius.This process takes a few hours.It is best to dry the kernels overnight.They must be completely dry in order to be finely ground.When the seeds are completely dry, they can be ground.For this you need a special grinder.The powder of the kernels is then placed in glycerin from the pharmacy and has to steep for several days.Users and interested parties who want to learn as much as possible about a specific product keep asking very specific questions and publish these questions in forums or in customer reviews.We were able to find a total of five questions about grapefruit seed extract that are asked again and again.We have answered these questions in the following sections.Grapefruit seed extract is a natural antibiotic that can be used against fungi, viruses and bacteria.The extract can also render parasites in the intestine harmless.In addition, the extract usually contains a lot of vitamin C and is an important source of this vitamin.The extract supports the immune system.Grapefruit seed extract is generally not dangerous.When used correctly, there are no health hazards.Symptoms of poisoning can only occur if an extremely excessive dose is taken.Side effects of grapefruit seed extract are practically unknown.The extract is very well tolerated.When used externally, itching may occasionally occur, which will subside as soon as the preparation is washed off.Grapefruit seed extract is considered to be particularly healthy because it can fight infections with natural plant ingredients.The immune system is additionally strengthened and the gastrointestinal tract is not additionally burdened when used internally.For grapefruit seed extract in capsules, it is recommended to start with a dosage of one capsule per day.With a preparation in drop form, no more than 5 drops should be taken three times a day at the beginning.The dosage can then be increased over time.Grapefruit seed extract is one of the numerous remedies that nature has placed at our disposal.In our test, we found that these extracts can have a variety of effects and objective health benefits.We were also able to determine that the preparations have improved on average in terms of effect and tolerability over the past few years.We were able to give a recommendation for 5 out of 10 preparations in our test.But we were also able to determine a clear test winner in this test.The rainbow circle extract from organic grapefruit seeds is a really excellent preparation with a good effect and tolerability.Dosing is very easy and precise.Virtually all users would recommend this preparation.We can also recommend this Rainbow Circle preparation if you are looking for a reliable, natural antibiotic based on grapefruit seed extract.Grapefruit seed extract as a natural antimicrobial food: a reviewBen Lesser is one of the most sought-after experts in the field of health, fitness and medicine.His articles impress with their unique research work and proven skills.He is a freelance medical writer specializing in creating content to improve public awareness of health issues.We have the honor of Ben writing exclusively for Dualdiagnosis.org.Your email address 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