Guerande Gray Salt Far from being mere sodium chloride, Gu?rande gray salt concentrates countless benefits taken from the sea. As the seawater slowly moves from ocean to salt pan, exposed to wind and sun, its salt content keeps rising and the salt crystals are enriched with health-enhancing minerals. The lower sodium content allows for more bioavailable magnesium (in chloride form), calcium and potassium, as well as trace elements such as copper, zinc, iron, manganese, and even minute amounts of iodine and fluoride. Being totally natural - it is unrefined and unwashed and contains no additives- Gu?rande salt retains all these qualities. Its no wonder this salt has been in every French kitchen for generations!