Another factor that affects the amount of iodine is the type of milk. Studies have shown that organic milk has significantly less iodine than conventional milk. Given the increasing popularity of organic milk, it is important to be aware of the nutritional implications of lower iodine concentration of organic milk, particularly in pregnant women and growing children. While individuals may prefer organic milk due to their concerns on the use of antibiotics in cattle or presence of pesticides and chemicals in regular milk, it is necessary for these individuals who choose organic milk to be aware that they may not be getting an equivalent quantity of iodine from organic milk. They should take necessary steps to ensure adequate iodine intake from alternative sources such as iodised salt.