Personally, I use a tool called Yuka, there is a Foss software similar to it but I don't utilize it that software since it's not as good as Yuka.
Now, of course it's not perfect but I use it as quick tool to make more informed decisions when I don't feel like going a schizo 50 webpage search to see if this particular brand of food™ will give me testicular cancer, or some hormonal issue, etc.
