Can a 7-year-old be given Multi-Sanostol with Bioaron D? Should I still buy some iron for this Multi-Sanosol, because I do not see it in the composition?

You can give a 7-year-old Multi-Sanostol with Bioaron D. You did not write that the child was diagnosed with iron deficiency, so I do not see the need for supplementation with this ingredient. There is no need to supplement the child with everything that seems appropriate to us - please remember that you can also harm the child. If you suspect that your child may be deficient because they do not eat certain foods, please talk to your pediatrician about it and perform appropriate tests. This is the right way to proper and safe supplementation. I am attaching a study that may be helpful: https://www.gdziepolek.pl/app/artykuly/czy-trzeba-suplementowac-witaminy-i-mineraly