The phrase "harmful preservatives" refers to substances that are added to food, drinks, or other products to prevent spoilage or increase their shelf life, but can potentially cause negative effects on our health. Full definition
Not only do these have a superior nutritional profile, they're also less likely to be full of harmful preservatives, antibiotics, steroids and pesticides which are commonly added to animal feed. (ourpaleolife.com)
To my surprise, many of these potentially harmful preservatives are also added to many baby products, AND baby wipes! (safbaby.com)
Some cats also like the juice from cans of baked beans, but these may contain harmful preservatives. (messybeast.com)