Potassium iodide
7681-11-0 · Antistrumin · Asmofug E · Bestmade Natural Products Kali Iodatum · Bestmade Natural Products Potassium Iodide (Kali Iod) · Caswell No. 694 · CCRIS 8168 · Dipotassium diiodide · EPA Pesticide Chemical Code 075701 · Gold etchant, standard · HSDB 5040 · Iodide, Potassium · Iodine (as potassium iodide) · Iodine (as potassium) · Iodure de potassium · Iosat · Jodetten depot · Jodid ratiopharm · Joptone · Kali iodatum · Kali Iodatum 1X · Kali iodide · Kalii iodidum · Kalium iodatum · Kaliumiodid · Kaliumjodid · Kisol · Knollide · Mono Jod · Pima · Pot iodide ammoniat · potasium iodide · Potassium diiodide · potassium iodid · Potassium iodide · Potassium iodide (K(I2)) · Potassium iodide (K2I2) · Potassium iodide (K3I3) · Potassium iodide (KI) · Potassium iodide ,meet Ch.P · Potassium iodide ACS grade · Potassium Iodide Oral Solution · Potassium Iodide Tablet · Potassium iodide, 99.5% · Potassium iodide, ultra dry · Potassium monoiodide · Potassium salt of hydriodic acid · potassiumiodide · Potide · Radiban · SSKI · Thyro Block · Thyro-Block · Thyroblock · Thyroblock (TN) · Thyroprotect · Thyrosafe · Thyroshield · Tripotassium triiodide · WLN: KA I · Potassium;iodide · Potassium iodideCAS 7681-11-0
Listed as a nutrient supplement by the US.
Listed as nutrient supplements (US)
- United States: Nutrient supplement — FDA, Substances Added to Food: POTASSIUM IODIDE
- United States: Nutrient supplements — 21 CFR 184.1634, citing 21 CFR 170.3(o)(20)
Potassium iodide is used to iodise table salt, supplying iodine to the diet.
Where it is and isn’t permitted
| Jurisdiction | Status | Scope and limits | Citation |
|---|---|---|---|
| Australia and New Zealand | No listed food uses foundThis site has not matched this substance to any food use on this jurisdiction’s list of authorised food additives. A food additive may be used only in foods that list names. Flavourings, enzymes, processing aids and added nutrients are regulated separately and do not appear on it. | ||
| Canada | No listing matchedHealth Canada’s lists name additives without E or INS numbers, so this site matches them by exact name. A substance listed there under a name this site does not recognise has no row here. | ||
| European Union | No listed food uses foundThis site has not matched this substance to any food use on this jurisdiction’s list of authorised food additives. A food additive may be used only in foods that list names. Flavourings, enzymes, processing aids and added nutrients are regulated separately and do not appear on it. | ||
| Great Britain | No listed food uses foundThis site has not matched this substance to any food use on this jurisdiction’s list of authorised food additives. A food additive may be used only in foods that list names. Flavourings, enzymes, processing aids and added nutrients are regulated separately and do not appear on it. | ||
| Japan | No listing matchedThis site imports only Japan’s list of designated additives (Appended Table 1 to the Regulations for Enforcement of the Food Sanitation Act), matched by English name. Existing additives, natural flavouring agents and ordinary foods used as additives are permitted outside that list and are not imported, so an empty row does not show that Japan does not permit the substance. | ||
| South Korea | Permitted, with conditions | Designated food additive: Standards and Specifications for Food Additives, Part III, 1. …Designated food additive: Standards and Specifications for Food Additives, Part III, 1. 일반식품첨가물 (general food additives), 요오드칼륨 (“Potassium Iodide”, the English the Code prints beside it); the Code marks it as also usable as a nutrient fortifier; 3. 영양강화제 (nutrient fortifiers), 요오드칼륨; nutrient: 요오드(I); the Code marks it as also usable as a general food additive. Main use (주용도) of 요오드칼륨: 밀가루개량제. Standard for use (사용기준) of 요오드칼륨: (1) [to be used under the general standard for use in II. 2. 1), the minimum amount that achieves the technical effect, with no limit set for this additive in particular] “II. 2. 1)의 규정에 따라 사용하여야 한다.” The Korean is the standard as published. There is no official English translation of the current Code (the English version on MFDS’s website is the 2020 edition and has no legal effect); the English in square brackets is this site’s description of what each sentence does, not a translation of the foods or the levels. Compositional specifications (Part IV) are not imported, nor are the general standards in Part II, which apply to every additive. | Standards and Specifications for Food Additives (식품첨가물의 기준 및 규격), MFDS Notification, Part III (Standards for use, by item)retrieved 2026-10-18 |
| United States | Permitted, with conditions | 21 CFR 172.375and 1 further provisionretrieved 2026-10-17 | |
| Codex Alimentarius | Not listedDoes not appear on this jurisdiction’s permitted list. That is not the same as being prohibited. |
How much is permitted
A listing usually limits the quantity as well as the food. Only one of the forms that takes is a figure: quantum satis and good manufacturing practice permit the amount the technological effect requires and no more, which is a limit rather than the absence of one. Figures below are the range across every food category this page is listed in, and categories differ between regulators — see how much is permitted.
| South Korea | — | 1 no quantity stated |
|---|---|---|
| United States | — | 2 no quantity stated |
No regulator sets a figure for Potassium iodide. That is not an absence of control: where the listing says quantum satis or good manufacturing practice, the quantity is limited to what the effect requires.
What it is made from
Produced by reacting iodine with potassium hydroxide. It oxidises and is slowly lost from salt in warm, humid conditions, which is why iodate is preferred in some climates.
- Vegan
- Vegetarian
Compare other additives on the dietary indexes.
- CAS registry number
- 7681-11-0
- InChIKey
- NLKNQRATVPKPDG-UHFFFAOYSA-M
- PubChem
- CID 4875
Every name it appears under
62 recorded names. A label may use any of them.
CAS registry number
- 7681-11-0
As it appears in regulation
- Potassium iodide
Other names
- Antistrumin
- Asmofug E
- Bestmade Natural Products Kali Iodatum
- Bestmade Natural Products Potassium Iodide (Kali Iod)
- Caswell No. 694
- CCRIS 8168
- Dipotassium diiodide
- EPA Pesticide Chemical Code 075701
- Gold etchant, standard
- HSDB 5040
- Iodide, Potassium
- Iodine (as potassium iodide)
- Iodine (as potassium)
- Iodure de potassium
- Iosat
- Jodetten depot
- Jodid ratiopharm
- Joptone
- Kali iodatum
- Kali Iodatum 1X
- Kali iodide
- Kalii iodidum
- Kalium iodatum
- Kaliumiodid
- Kaliumjodid
- Kisol
- Knollide
- Mono Jod
- Pima
- Pot iodide ammoniat
- potasium iodide
- Potassium diiodide
- potassium iodid
- Potassium iodide
- Potassium iodide (K(I2))
- Potassium iodide (K2I2)
- Potassium iodide (K3I3)
- Potassium iodide (KI)
- Potassium iodide ,meet Ch.P
- Potassium iodide ACS grade
- Potassium Iodide Oral Solution
- Potassium Iodide Tablet
- Potassium iodide, 99.5%
- Potassium iodide, ultra dry
- Potassium monoiodide
- Potassium salt of hydriodic acid
- potassiumiodide
- Potide
- Radiban
- SSKI
- Thyro Block
- Thyro-Block
- Thyroblock
- Thyroblock (TN)
- Thyroprotect
- Thyrosafe
- Thyroshield
- Tripotassium triiodide
- WLN: KA I
Systematic names
- Potassium;iodide
Hazard reference values
No reference value for this substance in the sources we hold.
Evidence and how bodies read it
Studies, and the differing conclusions regulators drew from them, are curated rather than machine-read, and none has been written for this substance yet.
Common questions
Assembled from what is above, in the words the questions are usually asked in. Each answer is the same statement the relevant section makes, with the same citations behind it.
- What is Potassium iodide?
- Potassium iodide is used to iodise table salt, supplying iodine to the diet.
- What is Potassium iodide used for in food?
- It is listed as a nutrient supplement — the role the US assigns it. This page shows every function each regulator records, with the citation for each.
- Is Potassium iodide banned in Europe?
- No. Potassium iodide is not on the EU's list of authorised food additives, but it would not be expected to be: every role regulators give it — nutrient supplement — the EU regulates under separate law. Its absence from the additives list says nothing about whether it is permitted in Europe.
- Where is Potassium iodide permitted?
- Of the seven regulators this site reads, South Korea and the US permit it. Each permission is for named foods at named levels, not a blanket one; the table on this page gives them with citations.
- Is Potassium iodide vegan?
- Yes. Potassium iodide is not derived from animals, and is suitable for vegetarians. This page says what it is made from and how.
Sources for this page
- kr retrieved 2026-10-18
- ecfr retrieved 2026-10-17
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