Last updated: 17/10/2022

Welcome to our large iodide test 2022. Here we present all the iodide supplements we have tested in detail. We have compiled detailed background information and added a summary of customer reviews on the internet.

We would like to make your purchase decision easier and help you find the best iodide for you. You can also find answers to frequently asked questions in our guide. If available, we also offer interesting test videos.

Furthermore, you will also find some important information on this page that you should definitely pay attention to if you want to buy iodide.


  • About 2 billion people worldwide suffer from iodine deficiency.
  • If your iodine needs are not met, your thyroid gland cannot produce enough hormones and thus cannot properly cotrol the vital functions of our body.
  • Iodide is available in various forms and can help you prevent iodine deficiency as well as treat an existing iodine deficiency.

Iodide test: Editors’ favourites

Guide: Questions you should ask yourself before buying iodide

What does my body need iodine for?

Iodine is a trace element and essential for the human body. Your body cannot produce iodine on its own. That’s why you have to make sure you get enough iodine from food and drinking water.

Iodide is found in certain table salts and is essential for our body’s function (Image source: / Edi Libedinsky)

Your thyroid gland can only produce the hormones thyroxine (T3) and triiodothyronine (T4) if you get enough iodine. With these two hormones it controls, for example, heart activity and blood pressure, mental well-being, digestion, muscle strength, and body and organ growth.

What are the signs of iodine deficiency?

Signs of iodine deficiency usually appear gradually. It can often take a long time before you notice the symptoms as such. Symptoms include

  • Persistent fatigue
  • Difficulty concentrating
  • Extreme sensitivity to cold
  • Sudden weight gain with no change in eating pattern
  • Tightness or pressure in the throat
  • Difficulty swallowing or breathing

If several of these signs apply to you, please see your GP, an internist or a thyroid expert as soon as possible.

What are the consequences of iodine deficiency?

First and foremost, an iodine deficiency causes your thyroid gland to produce too few hormones. Many basic bodily functions are thus reduced to a minimum; your body works on the back burner. At the same time, your body understands the decrease in your hormone balance as a signal to produce more hormones. To do this, it activates the cell growth of the thyroid gland.(1)

It thus grows continuously with the aim of compensating for the iodine deficiency and the resulting hormone deficiency. This enlargement is called a goitre (medical term: goiter). In severe cases, the goitre can be felt from the outside and can press on the trachea and oesophagus.

Consequently, the affected person suffers from breathing or swallowing difficulties. In addition, iodine deficiency can lead to hypothyroidism. In hypothyroidism, too few thyroid hormones are produced on a permanent basis.

This in turn causes your metabolism to slow down and is reflected in heavy weight gain, listlessness or dry skin. (2) To treat hypothyroidism, you usually have to take tablets for the rest of your life to replace the hormones that are missing in your body.

How can an iodine deficiency be detected?

The symptoms caused by an iodine deficiency are very unspecific. They can often be attributed to several diseases at the same time. So if you recognise certain signs, it makes sense to have your blood values checked in a laboratory.

If you suffer from persistent fatigue over a long period of time, you may be suffering from a mineral deficiency. Alternatively, you can take a urine sample at home and send it to a laboratory.

However, urinalysis only gives a tendency of the iodine balance and does not give an absolutely accurate measurement. If you want to be on the safe side, we advise you to take a blood sample from your family doctor. This way, your body’s iodine supply can be measured precisely.

What does iodide do?

Iodide ensures that your body’s iodine supply is replenished. Iodine supplements can be used prophylactically. This prevents a possible iodine deficiency and its deficiency symptoms from the outset.

Only with a full iodine store can your thyroid gland fulfil its vital function in the body. You feel mentally and physically fit and have a balanced energy metabolism. In addition, iodide is said to have an antioxidant effect in the head against free radicals. This has already been confirmed in studies.

Diseases include cardiovascular diseases, respiratory diseases, skin diseases and eye diseases. (3) On the other hand, you can take iodide therapeutically if you are diagnosed with an iodine deficiency. In such a case, you should work out a therapy together with your treating doctor, as hormone preparations are also used in addition to iodide.

For whom are iodine preparations suitable and for whom not?

In principle, iodide is suitable for everyone whose dietary intake of iodine is too low. Pregnant women in particular should make sure to cover their daily iodine requirement.

Too little iodine could not only pose a risk to the mother’s health, but also to the well-being of the child before and after birth. Possible consequences include impaired growth, bone maturation and brain development of the child.

Iodide is particularly suitable for pregnant and breastfeeding women, but also for children from infancy to adolescence. (Image source: / dolgachov)

Breastfeeding mothers should also ensure sufficient iodine intake, as a possible deficiency can be passed on to the infant via breast milk. Taking iodine supplements is also recommended for children and adolescents

An iodine deficiency in this phase of life not only hinders physical growth but also mental development and should therefore be avoided as far as possible. (4) In some cases, however, taking iodide is not advisable. These cases include

  • Suspicion of thyroid cancer
  • Hyperthyroidism (overactive thyroid gland)
  • Specific skin conditions

Anyone already suffering from a diagnosed thyroid disease should never take iodide negligently and on their own. As a general rule, we recommend that you always discuss iodine treatment with your GP so that you can weigh up the possible risks.

Do I really need iodide?

Whether you really need iodide or not depends primarily on your diet. If your daily iodine requirements are already covered by your diet, it is not necessary to take iodide. To give you an idea of how much iodine your body needs every day, we have prepared an overview for you.

This is based on the recommendations of the German Nutrition Society (Deutsche Gesellschaft für Ernährung e.V.) and gives the daily requirement in micrograms. (5)

Age group iodine requirement per day in micrograms
Infants 40 – 80 µg
Children, 1 – 9 years 100 – 140 µg
Children,10 – 12 years 180 µg
Adolescents and adults 200 µg
Adults over 50 years 180µg
Pregnant women 230 µg
Breastfeeding women 260 µg

What are the side effects of taking iodide?

Side effects after taking iodide include

  • Itching and burning of the eyes
  • Rhinitis
  • Irritated cough
  • Diarrhoea
  • Headache
  • Skin rash
  • Fever or similar symptoms

Generally, side effects occur only in very rare cases. However, if you are affected, we recommend that you discuss with your doctor what alternatives are available to you.

Iodide and iodate in foods such as salmon cannot cause an allergic reaction. (Image source: / Wow_Pho)

There is also the possibility of iodine intolerance. This means that high doses of iodine or the composition of certain medicines can cause an allergic reaction. But don’t worry: If you suffer from an intolerance, this does not mean that you cannot take any iodine at all. Iodised salt, sea fish or dairy products can of course still be part of your diet.

The forms of iodide and iodate found in these foods cannot cause an allergic reaction.

What should I pay attention to when taking iodine?

If you take a lot of iodine (more than 1 milligram of iodine per day), this can lead to an overdose. Signs of this are gastrointestinal complaints or skin rashes. A lot does not automatically help with iodine deficiency.

Just as you can give your body too little iodine, you can also give it too much. Both have negative consequences. There are also a number of medicines that contain iodine. These include iodine contrast agents, iodine tinctures and amiodarone.

If you take iodine preparations in addition to such medication, the daily iodine requirement may be exceeded. This will result in undesirable side effects of the treatment. We therefore advise you to talk to your family doctor first so that you can get an idea of your total iodine intake.

What alternatives are there to iodide?

The most natural way to take in iodine is through food. The most important source of iodine is iodised table salt. Since there is also a lot of iodine in seawater, sea fish and algae are ideal sources of iodine.

Food iodine content per 100g
Haddock 100 – 300 μg
Herring and tuna 100 – 250 µg
Cod and plaice 50 – 200 µg
Milk and dairy products 10 µg
Chicken egg 10 – 30 µg per egg yolk

The above-mentioned foods are ideal for balancing your iodide balance.

Decision: What types of iodide are there and which is right for you?

If you want to compare iodine supplements, you can basically distinguish between four different types

  • Iodine tablets
  • Iodine capsules
  • Iodine effervescent tablets
  • Iodine solutions

To make it easier for you to decide which type of iodine preparation is best for you, we have compiled important information and the advantages and disadvantages of all four.

What are the characteristics of iodine tablets and what are the advantages and disadvantages?

Iodine tablets (scientifically: potassium iodide tablets) contain the active ingredient potassium iodide as well as carriers, such as potato or maize starch, and separating agents, such as magnesium stearate. Many manufacturers’ tablets also contain lactose. So if you suffer from lactose intolerance, read the package leaflet before buying.

  • Inexpensive
  • Easy to dose
  • Suitable for all diet types
  • Controversial ingredients
  • Unsuitable if you have difficulty swallowing
  • May contain lactose

Iodine tablets are tasteless, handy and can be taken anywhere. They also have a break notch as standard so that the dosage can be adjusted. This means, for example, that an entire household can take the same iodine tablets.

However, some preparations contain synthetic substances and flavour enhancers such as silicon dioxide. It is unclear whether these substances could harm the body in the long term. You should therefore look at the ingredients before buying and, if necessary, find out more about them.

What are the characteristics of iodine capsules and what are the advantages and disadvantages?

Iodine capsules are usually 100% natural. The iodine contained in them is obtained from algae (kelp), for example. Although algae have a strong taste and smell of their own, iodine capsules are tasteless and odourless. In addition, they are usually free of gelatine or other animal ingredients, making them ideal for vegans or people with lactose intolerance.

  • Inexpensive
  • Free of unwanted additives
  • Suitable for all dietary types
  • Difficult to administer for children
  • Unsuitable if you have difficulty swallowing
  • Should be stored in a cool place

You can choose between capsules with different amounts of active ingredient from 100 µg to 300 µg iodine per capsule. Because of their smooth surface, iodine capsules are relatively easy to take. However, there is a possibility that the capsules cannot be swallowed by children because of their size.

Buying iodine capsules is a bit more expensive with a price of 10€ to 20€ per pack, but they are sufficient for 6 to 12 months if taken according to the product information.

What are the advantages and disadvantages of iodine tablets?

Effervescent iodine tablets are dissolved in water so that the ingredients are supplied in liquid form. This allows the iodine to be absorbed more quickly and, accordingly, to take effect more quickly. While there are hardly any pure iodine effervescent tablets on the market, you will find many multivitamin effervescent tablets that contain iodine as well as various vitamins and minerals.

  • Easy to take for children
  • Suitable for people who have difficulty swallowing
  • Additional vitamins and trace elements
  • Impractical for travelling
  • High sodium content
  • Should be stored in a dry place

However, effervescent tablets often contain high amounts of sodium carbonate. People with blood pressure in particular should be careful here and possibly resort to another form of iodine preparation.

The effervescent tablets usually taste fruity and are therefore especially suitable for children. Effervescent tablets are also suitable for people who have difficulty swallowing tablets and capsules.

What distinguishes iodine solutions and what are the advantages and disadvantages?

Iodine solutions are so-called Lugol’s solutions or potassium iodide solutions. They are characterised by the brown-red colour of the iodine. A 5% solution consists of a 1:2 ratio of iodine to potassium iodide in water.

(5% iodine, 10% potassium iodide, 85% water) Oral intake of iodine solutions is widespread, despite the unpleasant taste and smell of the solution. For this purpose, the solution is added drop by drop to water or other liquids and then drunk.

  • Inexpensive
  • Easy to take
  • Easy to dose
  • Rapid absorption of the active ingredients in the body
  • Unpleasant taste
  • Penetrating odour
  • High degree of cleanliness required
  • Should be stored in the dark

The solutions are available in bottle sizes from 30 ml to 100 ml. The vials are usually equipped with a pipette in the lid to simplify dosing. With a 5% solution, one drop corresponds to about 6.5 µg of iodine. The cost of a bottle ranges from €10 to €30, depending on the size and manufacturer. Although this price seems high, it takes a long time to use up a vial. With clean pipetting, you can use a solution for about 2 years.

Buying criteria: These are the factors you can use to compare and evaluate iodide

In the following, we will show you which aspects you can use to decide between the many possible iodine preparations. At a glance, these are:

  • Iodine content
  • Package size
  • Presentation
  • Ingredients
  • Vegan diet and intolerances
  • Taste

How to interpret and evaluate the individual purchase criteria can be found in the following sections.

Iodine content

Of course, before buying an iodine preparation you should think about the amount of active ingredient the preparation should contain. Last but not least, it is important to know who the iodine is intended for.

Pregnant women and breastfeeding mothers have an increased need for iodide.

If you want to give it to a small child, for example, a lower dose is sufficient than for pregnant and breastfeeding women.

Pregnant women and breastfeeding mothers need not only sufficient iodide but also a large amount of vitamins to meet their daily nutritional requirements during pregnancy. The iodine content of a preparation also determines how often it should be taken.

For example, if you only want to take a tablet once a week, a high-dose preparation is recommended. If you take it every day, a lower dose will be enough.

Package size

How long a package lasts depends mainly on the package size. As a rule, the larger the pack, the lower the price per unit. Therefore, the choice of pack size is often a purely economic decision.

However, you may find very large packs of up to 365 iodine capsules. Therefore, before you buy, ask yourself how regularly you want to take your preparation. This way you can decide in advance whether a large pack is worthwhile and whether you can use it up within the shelf life.


The preferred form of administration varies from person to person. For children or older people, it may be easier to use iodine dissolved in water. On the other hand, it is more practical and quicker to take it in capsule or tablet form.

The dosage form also has an influence on the speed with which the iodine is absorbed by the body: In liquid form, the active ingredient is already dissolved and can thus reach the organism particularly quickly.

Most iodide effervescent tablets have a delicious, fruity taste. (Image source: / stevebp)

However, when taking iodine – unlike with painkillers, for example – it is not important for the substance to unfold and take effect as quickly as possible. This aspect therefore plays a subordinate role, but you can of course still take it into account in your purchase decision.


As you may have already discovered above, there are many iodine supplements that contain other trace elements, vitamins or minerals in addition to iodine. It makes sense to make sure that pregnant or breastfeeding women get enough minerals.

Of course, you may not be interested in other active substances and simply want to take iodine. You can usually tell at first glance whether a product is a pure iodine preparation or not. If you are unsure about this, you should read the manufacturer’s description.

Intolerances and vegan diet

You will also find a suitable iodine preparation for intolerances and vegan diet. The important thing is that you know what to look for. Vegans should be careful when buying iodine tablets, but also iodine capsules: Iodine tablets often contain lactose, whereas iodine capsules sometimes contain a shell made of animal gelatine.

As a rule, manufacturers are very transparent here and it should not be a problem to find out whether animal ingredients have been used. The lactose contained in iodine tablets can also be an obstacle if you suffer from lactose intolerance.

For people who suffer from fructose intolerance, be careful with effervescent tablets. Fructose may be included as a sweetener to create a pleasant fruity taste. If any of the aspects described are relevant to you, be sure to read the package information. If you are still unsure, we recommend that you contact the manufacturer.


The taste of medicines can be a decisive criterion for taking them. Here, too, it is important to consider who the medicine is intended for. While most preparations are tasteless, you will find an artificially produced fruit flavour, especially in effervescent tablets.

This can make it easier to take the iodine. This contrasts with iodine solution: it has a very strong and rather unpleasant taste and for this reason cannot be taken orally by some people.

So if you are a little sensitive about taste, we advise you to find out what product tastes like before you buy it. This way you can avoid unpleasant surprises when taking the product.

References (6)

1. Praxisklinik Bornheim & MVZ Bonn. Jodmangel oder Jodüberversorgung?. 2015 Jan 7; Jodmangel.

2. Herter-Aeberli I, Cherkaoui M, El Ansari N, Rohner R et al. Iodine Supplementation Decreases Hypercholesterolemia in Iodine-Deficient, Overweight Women: A Randomized Controlled Trial. J Nutr. 2015 Sep;145(9):2067-75

3. Winkler R. Iodine―A Potential Antioxidant and the Role of Iodine/Iodide in Health and Disease. Natural Science. 2015 Nov 24; Vol.07 No.12(2015), Article ID:61430,10 pages

4. Scinicariello F, Buser MC. Association of Iodine Deficiency With Hearing Impairment in US Adolescents Aged 12 to 19 Years. JAMA Otolaryngol Head Neck Surg. 2018;144(7):644-645.

5. Deutsche Gesellschaft für Ernährung e. V. Jod. Deutsche Gesellschaft für Ernährung e. V. 2019

6. Robert Koch Institut. Das Jodmonitoring. Robert Koch-Institut. 2009 Dez 7; Epidemiologisches Bulletin Nr. 49, S. 509

Wissenschaftlicher Artikel
Praxisklinik Bornheim & MVZ Bonn. Jodmangel oder Jodüberversorgung?. 2015 Jan 7; Jodmangel.
Go to source
Wissenschaftliche Studie
Herter-Aeberli I, Cherkaoui M, El Ansari N, Rohner R et al. Iodine Supplementation Decreases Hypercholesterolemia in Iodine-Deficient, Overweight Women: A Randomized Controlled Trial. J Nutr. 2015 Sep;145(9):2067-75
Go to source
Wissenschaftliche Studie
Winkler R. Iodine―A Potential Antioxidant and the Role of Iodine/Iodide in Health and Disease. Natural Science. 2015 Nov 24; Vol.07 No.12(2015), Article ID:61430,10 pages
Go to source
Wissenschaftliche Studie
Scinicariello F, Buser MC. Association of Iodine Deficiency With Hearing Impairment in US Adolescents Aged 12 to 19 Years. JAMA Otolaryngol Head Neck Surg. 2018;144(7):644-645.
Go to source
Wissenschaftlicher Artikel
Deutsche Gesellschaft für Ernährung e. V. Jod. Deutsche Gesellschaft für Ernährung e. V. 2019
Go to source
Wissenschaftlicher Artikel
Robert Koch Institut. Das Jodmonitoring. Robert Koch-Institut. 2009 Dez 7; Epidemiologisches Bulletin Nr. 49, S. 509
Go to source