Yeah...site said completely safe. Organic too! If you're into that stuff... Squishing in more fun, I used the same technique on several slugs and one tomato horn worm today.Cool natural solution to aphids. Since tomato leaves are only mildly toxic, it should be no problem to use on food crops.
I'm still using conventional warfare right now. Squishing any aphids I see. Last night I only found five aphids so I'll continue squishing unless they get out of hand.