Yes, you can take magnesium, omega acids, vitamin D and biotin together, no significant interactions have been found between the preparations. These preparations can be taken during or after breakfast at a minimum interval of 30 minutes from Euthyrox.

Here you can compare the prices of selected preparations containing magnesium, omega acids and biotin, book them or order them for delivery:

https://www.gdziepolek.pl/kategorie/magnez

https://www.gdziepolek.pl/substancje/kwasy-omega

https://www.gdziepolek.pl/substancje/biotyna

In cities such as Warsaw, Wrocław, Łódź or Białystok, products can be ordered with instant delivery even in 1 hour thanks to the Wolt Drive service - check if the service is available in your location:

https://www.gdziepolek.pl/koszyk/szybka-dostawa?src=zf

I encourage you to familiarize yourself with the helpful materials:

https://www.gdziepolek.pl/artykuly/czy-mozna-laczyc-leki-ze-soba