Iodine is an essential element for the human body and an important substance involved in the synthesis of thyroid hormones. 80-90% of human iodine comes from food, 10-20% from drinking water and 5% from air.

However, iodine is scarce in nature, except for seawater, kelp, sea fish, shellfish and other marine plants and animals which contain high amounts of iodine, the content in most soils, rocks and water sources is very low.

At the same time, the human body is not able to store iodine for a long time. With the cessation of iodine intake, the iodine content in the human body is only enough to maintain the body's operational requirements for 2-3 months.

Iodized salt is the main source of iodine intake, but it is not inherently iodized and is fortified with iodine.

The common iodine fortification agents in salt are potassium iodide, potassium iodate and seaweed iodine, each of which is different from the other.

Potassium iodide
Potassium iodide has good solubility and can be atomized and sprayed directly onto the surface of dry raw salt. However, because of this, during transportation and storage of salt, if moisture occurs or if it is exposed to air, strong light and heat, or acidic environment for a long time, the potassium iodide in salt will oxidize and fail.

Potassium iodate
In contrast, potassium iodate is not as difficult to work with. Since it is less soluble than potassium iodide, it does not require high salt purity and environmental requirements. Of course, even the low solubility does not affect our iodine supplementation, as a solution of about 4% is sufficient to fortify the iodine content of salt to 100 mg/kg.

Algae iodine
Seaweed iodine is a purely natural biological iodine extracted from marine algae.
Seaweed iodine contains 80% inorganic iodine and 20% organic iodine, which has the advantages of both organic and inorganic iodine.

Organic iodine, on the other hand, is not only absorbed and decomposed by the body, but can also be stored in the form of synthetic fat or protein, which can be used by the body to synthesize thyroid hormones when needed by the thyroid gland.
This ensures adequate iodine supplementation while avoiding excess iodine.
Iodine is a good thing, whether it is potassium iodate, potassium iodide, or algal iodine, all of which have made a big contribution to the long iodine supplementation project in the human body.