Over the Counter Zinc Additive

OK, it is the 2nd link, at the bottom. Zinc mass is 1.56%, which works out to 15,600 PPM in that bottle's volume.
Here is the link by itself:

https://rislone.com/wp-content/uploads/2014/11/4405-Tech-Sheet.pdf
Pretty concentrated. A small amount and you are well over 1000 ppm.