Chris Hogg writes
Newsprint paper is made from simple wood-pulp. Glossy papers, such as
used for magazines etc. have coatings of fine white mineral pigments
such as china clay, chalk or titanium dioxide, in order to give a
smoother, whiter surface that is both glossy and better for printing
on.

In the past, many of the pigments in coloured inks use for magazines
were toxic, but so much paper gets recycled these days, and health &
safety considerations are so important, that I doubt very much if any
modern inks are toxic.

The main issue is the likely re-use of the material in food packaging,
and so its all produced to a standard that will meet these specs after
recycling, AIUI.
--
David