It's best to use non-iodized salt, such as pickling salt or sea salt, for fermenting. Iodized table salt can inhibit the growth of beneficial bacteria and may affect the flavor and color of your fermented foods.
The fermentation process relies on the activity of beneficial bacteria, such as *Lactobacillus*, to convert sugars into acids, which preserve the food and create unique flavors. Iodine, which is added to table salt to prevent iodine deficiency, can act as an antimicrobial agent. This means it can hinder or even kill the beneficial bacteria needed for successful fermentation. Using iodized salt can lead to slow or incomplete fermentation, resulting in spoilage, undesirable flavors, or a mushy texture. Non-iodized salts like pickling salt, kosher salt, or sea salt do not contain iodine or anti-caking agents, making them ideal for creating a healthy environment for the fermentation process. These salts provide the necessary sodium chloride to control unwanted bacteria and draw out moisture from the vegetables, creating the brine needed for fermentation.
Always check the label of your salt to ensure it's non-iodized and doesn't contain any anti-caking agents. These additives can also interfere with the fermentation process.