The Swerve Ultimate Sugar Replacement Sweetener is a brown sugar substitute that is made with erythritol, a sugar replacement sweetener that is less than 50 calories per serving. This product comes in a convenient sachet form and is gluten-free, making it suitable for various desserts. It is a popular choice for those looking for a low-calorie sweetener that does not have the negative effects of traditional sugar. Additionally, this product carries a California Prop 65 warning, indicating that it may contain chemicals known to cause cancer and birth defects.