The phrase "nasty ingredients" refers to harmful or unpleasant substances that are used in the making of something, like food or products. Full definition
The fake stuff is just packed full of nasty ingredients with no nutritional value. (beyondthepeel.net)
I want something without nasty ingredients, smells good, and that I can (maybe) put on my face without breaking out. (atouchofteal.com)
Coconut milk is my new favourite smoothie base especially since we found a great wholesale supplier of a premium version with no added nasty ingredients. (cantillonkitchen.com)