Masa Harina or dough (masa) flour (harina) is also called Mexican flour because it’s widely used in said country. However, although this is a common ingredient in Mexico and other Latin American countries, it is not available everywhere.
That’s why the best masa harina substitute has been a common problem for most people.
As we all know, food recipes are universal and we all use them. It would be sad if you can’t make a particular recipe just because you can’t find this simple ingredient that can be substituted anyway.