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Please note, we cannot prescribe or recommend dosages. Here is an excerpt from the book Folk Medicine by Dr. Jarvis (full text at lugols.com):

"In 1829 a French physician named Lugol originated a solution which contains iodine in a solution of potassium iodide. It has been used steadily ever since it was originated.

When used to maintain the iodine content of the body the dose is small and is taken only on certain days of the week. When the mineral content of the body is analyzed, only a trace of iodine is found. Ten drops of iodine represent more iodine than is found in the entire body. For this reason, the dose of Lugol's solution of iodine is one or two drops (In this article Dr. Jarvis is speaking about Lugol's Solution 5%. When using Lugol's Solution 2% use 2-3 single drops to get the equivalent), depending on your body weight. If you weigh 150 pounds or less, for example, your dose to maintain the normal iodine content of the body is one drop, taken at one meal on Tuesday and Friday of each week. If you weigh more than 150 pounds, the dose should be two drops instead of one. It is useful to remember that the human body works on the minimum of anything it needs. If there should be a rise in sickness in the area where you live, it would be well to take the Lugol's solution three times a week instead of two, on Monday, Wednesday, and Friday, for the purpose of storing up reserve.

How is the drop of the solution to be taken, on the directed days? In general, medical men prescribe iodine to be taken on an empty stomach, preferably 20 minutes before food is taken. During the passing years Vermont folk medicine has worked out a different plan and it is one I like to follow. It has been referred to in another connection elsewhere in this book. To repeat, adding one teaspoonful of apple cider vinegar to a glass of water to make the water acid in reaction, holding the medicine dropper horizontal in order to get a maximum drop, one drop of the Lugol's solution is added to the mixture. The contents are stirred with a spoon and sipped through the course of the meal, as one would drink a cup of coffee or tea."

An additional resource that might be helpful can be found here:

https://www.klinik-st-georg.de/en/lugols-solution/

For our 2% solution: Each drop (= 1/20 ml) is approximately 1.0 mg of iodine and 2.0 mg of potassium iodide. The Iodide portion of Potassium Iodide is about 75% so that is 1.5 mg. Therefore the total Iodine plus Iodide is 1.0 + 1.5 = 2.5 mg  and 2 drops is about 5.0 mg's of iodine/iodide (2.0 mg iodine, 3.0 mg iodide).  

For our 5% solution: Each drop (= 1/20 ml) is approximately 2.5 mg of iodine and 5 mg of potassium iodide. The Iodide portion of Potassium Iodide is about 75% so that is 3.75 mg. Therefore the total Iodine plus Iodide is 2.5 + 3.75 = 6.25 mg  and 2 drops is about 12.50 mg's of iodine/iodide (5.0 mg iodine, 7.50 mg iodide). 

The Lugol's Solution 2% is a straight distilled water dilution of our Lugol's Solution 5%. There is no other difference. To get the equivalent of the Lugol's Solution 5% when using the Lugol's Solution 2%, use 2-3 drops.

J.CROW'S® Lugol's Solution is made from Distilled Water (H2O), Potassium Iodide (KI), and Iodine (I). The product is a stable chemical mixture and does not “expire”. In technical applications a retest date of 3 years from date of purchase may be used to establish and re check specific parameters or guidelines. In case of evaporation add distilled water.

A variation in the color of Lugol's Solution of Iodine, both 2% and 5%, may be caused by storage conditions, extreme temperature in transit (hot or cold), or any number of other environmental variables. 

If you are concerned about color variation, you may return any bottle you like for an exchange or full refund.

While the % may vary, the contents are the same in all instances i.e. Lugol's Solution 2% contains 2% iodine, 4% potassium iodide, 94% distilled water. Lugol's Solution 5% contains 5% Iodine,10% potassium iodide and 85% distilled water.

Yes and please note the following: We use a natural rubber bulb with our dropper assembly; a material used for such purposes for over 100 years. Iodine is a disinfectant,highly corrosive and drying agent/halogen. If subjected to extreme temperatures, certain levels of humidity or dryness or not stored upright this corrosion and drying may occur and affect the rubber bulb. Most times it never happens. Nonetheless, J.CROW'S® guarantees customer satisfaction and guarantees every bottle sold for the life of the bottle. We will replace any dropper assembly or dropper bulb at any time at no charge for customers within the United States. International orders ship with an extra dropper top. With over 50 years of manufacturing experience, we have determined that a glass pipette dispensing assembly is far superior for accurate measurement than any other method available. Orifice reducer tops are not satisfactory since there is no control for dispensing accurately. Bottles with two tops mean you have to interchange and iodine gets all over the place. Any bulb and pipette assembly dispensing a halogen are potentially subject to corrosion, drying or evaporation through membrane leakage. We are aware of all these variables and stand by our product, the dispensing system, and its efficacy, in every instance.

Nascent Iodine is NOT the same as J.CROW'S® Lugol's Solution, the original Lugol's Solution. The term " iodine " actually describes a single atom of iodide bound to either another atom of iodide or to another compound. “Nascent iodine” was once used as simply another name for sodium iodide (an iodide atom bound to sodium). The term was then used by the American mysticist, Edgar Cayce, to describe a free form of iodine (i.e., a single atom of iodide unbound to any other atom) - apparently created by adding electromagnetic or another form of energy. However, when this free form of iodide is exposed to a positively charged ion, such as sodium or potassium, as it would be in a liquid supplement, it will bind with these to form sodium iodide or potassium iodide. Therefore, if you are buying a supplement promoted as “nascent iodine”, it is most likely sodium iodide or potassium iodide. Again, J.CROW'S® Lugol's Solution is the original Lugol's Solution containing iodine (I), potassium iodide (KI), and distilled water (H2O).

There do not appear to be any published, placebo-controlled studies on “nascent iodine” for thyroid support or any other use.

A talisman is something for good luck. We use the phrase "Talisman Only" as a disclaimer. We make no claims in order to avoid regulatory concerns which have not otherwise tested Lugol's solution for specific conditions or uses. Lugol's has been widely recognized as a traditional and metabolic disinfectant for almost 200 years.

J.CROW'S® Lugol's Solution is made from elemental iodine and potassium iodide in distilled water. It is equivalent to USP or higher and of the highest purity and the very same type and quality a doctor may recommend when prescribing iodine (which only a doctor may do). The iodine and potassium iodide used in J.CROW'S® Lugol's Solution is derived from natural salt brine deposits 2 miles beneath the surface, in the Western United States, one of the few places in the world where such deposits exist. It is compounded and manufactured in a registered EPA manufacturing facility which produces numerous USP certified bulk products according to the U.S. Food and Drug Administration Current Good Manufacturing Practices.

Lugol's has been in continuous use since 1829. As a unique chemical mixture it has a wide range of diverse applications, many of which are non medical or supplemental; water purification, general purpose disinfectant (within a number of different industries), chemical reagent, etc. to name a few.

While the history and usefulness of iodine is well known and while Dr. Jarvis understood the benefits of its many diverse applications (as few others do today), we make no claims with respect to its efficacy for any purpose whatsoever.