Ethylenediamine Dihydriodide

Chemical producers manufacture this salt for feed mineral blends. One documented route reacts ethylenediamine with hydroiodic acid in water. Suppliers offer the resulting ingredient as dry crystals, powder or granules.^7,8

1. 01 // Source Chemical inputs Ethylenediamine and hydroiodic acid are the starting materials in a documented production route.
2. 02 // Process Reaction in water Aqueous solutions of the starting materials react to form the iodine salt.
3. 03 // Output Crystalline EDDI A supplier offers white or off-white crystals, powder or granules for use in pet food.

1. 01

   Supplies required iodine

   Manufacturers add EDDI to help a finished food meet its iodine target. Dogs need iodine to make thyroid hormones, but the ingredient list does not disclose the finished level.^3,5,9

2. 02

   Delivers a trace dose

   At about 80% iodine, a small amount contributes measurable iodine without adding meaningful protein, fat or starch. Other ingredients must be counted when setting that amount.^4,6

3. 03

   Fits bulk mineral blending

   A supplier sells dry EDDI for pet food and cattle feed. FDA also documents its use in mineral mixtures, a way to distribute a trace ingredient through production batches.^5,7

How much At 80% iodine, meeting the 1 mg/kg dry-food minimum would take about 1.25 mg EDDI/kg if no other ingredient supplied iodine.^4,6

1. Brands say

   EDDI supplies iodine dogs need

   Evidence

   1. Strong
   2. Some
   3. Thin
   4. None

   Feedtables lists 800,000 mg iodine per kg of dry EDDI, and FDA recognizes its nutritional use. It supplies iodine, but its place on the ingredient list does not reveal the finished food's iodine level.^4,5,9

2. Brands say

   EDDI prevents iodine deficiency hypothyroidism

   Outruns the evidence

   Evidence

   1. Strong
   2. Some
   3. Thin
   4. None

   Two single-dog reports describe recovery after dietary iodine was restored; one dog's thyroid tests normalized after 31 days. Neither report tested EDDI or showed that an already adequate diet needs extra iodine.^2,3,5

3. Vets say

   Too much dietary iodine disrupts thyroid function

   Evidence

   1. Strong
   2. Some
   3. Thin
   4. None

   In a controlled study of 18 puppies, iodine-rich diets raised TSH, lowered T4 and enlarged thyroids. The study used potassium iodide, so it supports a total iodine concern; it did not test EDDI at normal recipe amounts.¹

4. Owners say

   Extra iodine speeds a healthy dog's metabolism

   Outruns the evidence

   Evidence

   1. Strong
   2. Some
   3. Thin
   4. None

   The 18-puppy study found worse thyroid measures with high iodine intake. The case reports show improvement after correcting deficiency, not after raising iodine above an adequate intake. No metabolic boost was demonstrated.^1,2,3