Lecithin is a natural substance that is widely used in various industries, including food production, cosmetics, and pharmaceuticals. It is a popular emulsifier, which means it helps to blend two substances that would otherwise separate, such as oil and water. There are several types of lecithin available, but soy lecithin and sunflower lecithin are the most commonly used. While they may seem similar at first glance, there are significant differences between the two that can impact their suitability for different applications.