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Potassium iodide

Potassium iodide suppliers and sourcing guide

Potassium iodide is the potassium salt of hydriodic acid, about 76% iodine by weight. It occurs in seawater and salt deposits but is made commercially by reacting iodine or hydriodic acid with a potassium base and crystallizing the salt. Because iodine is dosed in micrograms, most brands buy potassium iodide as a stabilized dilution or premix rather than as pure white crystals, and it is also the usual form used to iodize table salt.

See suppliersWhat to ask for on the COA
Also known as
KI · Iodide of potassium
Facts checked
November 2026

Forms and grades of potassium iodide

Suppliers sell different products under the same name. Specify the one you need.

  • USP and food-grade crystals

    Pure potassium iodide crystals or powder, used by premix makers and for salt iodization.

  • Triturations

    Potassium iodide diluted to a stated strength on a carrier such as dicalcium phosphate, maltodextrin or microcrystalline cellulose for even microgram dosing.

  • Stabilized grades

    Blends with stabilizers that slow oxidation to free iodine, used in iodized salt and premixes.

  • Mineral premixes

    Custom blends where potassium iodide is one of several trace minerals; the iodine level per gram belongs on the specification.

What to check on the COA

Compare each result with your own specification when the lot arrives.

Assay
Potassium iodide by titration for crystalline material; iodine content by titration or ICP-MS for triturations and premixes.
Iodate and free iodine
Limit tests for iodate and for free iodine formed by oxidation, which shows up as yellowing.
Loss on drying
Moisture, which speeds oxidation.
Alkalinity
A limit test for free alkali.
Heavy metals
Lead and other metals by ICP-MS.
Content uniformity
For triturations, multiple assays across the lot to confirm even distribution.

Storage, lots and expiry

Storage and shelf life

Potassium iodide oxidizes in light, air and moisture and turns yellow as free iodine forms, so keep it in tightly closed, light-resistant containers in a cool, dry area. Triturations and premixes need the same protection. Shelf life is set by the supplier's stability data and specification, and older lots are retested for iodine content.

Lots and expiry dates

Record the iodine assay and dilution strength for each lot, and check color on receipt; yellowed material should be retested. Keep pure crystals and dilutions on separate item codes to avoid dosing errors.

Regulatory status

Facts from regulators and standards bodies, each linked to its source.

  • 21 CFR 184.1634 affirms potassium iodide as GRAS as a nutrient supplement and for use in table salt as a source of dietary iodine at a maximum level of 0.01 percent.

    Source: ecfr.gov (opens in a new tab)

  • 21 CFR 172.375 permits potassium iodide as a food additive source of iodine, with limits on total daily iodine, including 225 micrograms for foods labeled without reference to age or physiological state.

    Source: ecfr.gov (opens in a new tab)

  • 7 CFR 205.605(a) lists potassium iodide among the nonsynthetic substances allowed in or on processed products labeled organic.

    Source: ecfr.gov (opens in a new tab)

  • Health Canada's Multi-Vitamin/Mineral Supplements monograph for natural health products lists potassium iodide among the source ingredients for iodine (Table 2).

    Source: webprod.hc-sc.gc.ca (opens in a new tab)

This is general information, not regulatory advice. Status differs by country and by how the ingredient is used, so check the rules for your product and market.

Potassium iodide suppliers

Manufacturers and distributors whose own websites say they sell it.

We are checking potassium iodide suppliers now

Every listing is checked against the supplier’s own website before it goes live, so this list fills in over the coming weeks. The specs and COA checklist above are ready today.

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Frequently asked questions

What forms of potassium iodide can brands buy?

Common forms include uSP and food-grade crystals, triturations, stabilized grades and mineral premixes. Ask each supplier for the specification sheet of the exact grade they quote.

What should the COA for potassium iodide include?

Expect assay, iodate and free iodine, loss on drying, alkalinity, heavy metals and content uniformity, each with its method, specification and result for that lot.

How should potassium iodide be stored?

Potassium iodide oxidizes in light, air and moisture and turns yellow as free iodine forms, so keep it in tightly closed, light-resistant containers in a cool, dry area. Triturations and premixes need the same protection. Shelf life is set by the supplier's stability data and specification, and older lots are retested for iodine content.

What is the regulatory status of potassium iodide?

21 CFR 184.1634 affirms potassium iodide as GRAS as a nutrient supplement and for use in table salt as a source of dietary iodine at a maximum level of 0.01 percent. 21 CFR 172.375 permits potassium iodide as a food additive source of iodine, with limits on total daily iodine, including 225 micrograms for foods labeled without reference to age or physiological state. 7 CFR 205.605(a) lists potassium iodide among the nonsynthetic substances allowed in or on processed products labeled organic. Health Canada's Multi-Vitamin/Mineral Supplements monograph for natural health products lists potassium iodide among the source ingredients for iodine (Table 2).

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