If you are talking about factory ammunition, this is easy.
Most all Premium offerings from the big ammunition companies (Winchester, Federal, Speer, Hornady, Remington) contain flash suppresant. This is part of the reason for the higher price.
This is not true of most of the offerings from the smaller Boutique companies.
There is no flash supressant in any of the bargain priced ammo like UMC or WWB. After all we are buying those to save money.
If you are talking about loading your own, that is much harder. I am not aware of any end user powders that have flash suppressant. Again, we usualy handload to save money.