Salt
The amount of iodine and the specific iodine compound added to salt varies from country to country. In the United States, the Food and Drug Administration (FDA) recommends [21 CFR 101.9 (c)(8)(iv)] 150 micrograms of iodine per day for both men and women. US iodized salt contains 46–77 ppm (parts per million), whereas in the UK the iodine content of iodized salt is recommended to be 10–22 ppm.
Jean-Francois Coindet
After his findings became public, many other physicians also began to prescribe iodine which led to a high rate of adverse effects. This led to a public controversy over the use of iodine. Coindet advised to control the dose of iodine closely to limit adverse effects. In January 1821, the local authorities in Geneva prohibited the sale of iodine unless prescribed by a doctor.