FDA Instructions for Making Lugol’s 5% Iodine

Source: https://www.fda.gov/food/laboratory-methods-food/bam-r40-lugols-iodine-solution

January 2001

Potassium iodide (KI)10 g
Iodine5 g
Distilled water100 ml

Dissolve KI in about 20-30 ml of distilled water. Add iodine and heat gently with constant mixing until iodine is dissolved. Dilute to 100 ml with distilled water. Store in amber glass-stoppered bottle in the dark.


Original Source: Bacteriological Analytical Manual, 8th Edition, Revision A, 1998.

But Jason, where do I get potassium iodide crystals, and iodine pellets?

I’m glad you asked. I usually buy them at amazon.com.

I look for “Potassium Iodide crystals” at amazon. 100 grams, 99.98% pure, for $19.94. The purity is as pure as things get. It’s both pharmaceutical grade, and food grade, the purest grade they make, the purest grade you can buy.

I have been able to find “iodin prills” at ebay, usually from Chinese sellers.

Or, you can search for the premade “lugol’s iodine” at amazon.

Or better values are found at buyiodine.com

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