sulfur

Hi, I'm having some issues with mites(most likely red poultry mites but I'm honestly not positive), in particular on a couple of my girls who are convalescing right now and can't dust bathe on their own. I was wondering what brands of sulfur dust are considered safe and where you usually get...

My eggs smell like sulfur and urine, especially when I cook them... I don't eat these ones because I fear that it will taste like sulfur or that these eggs are contaminated. How do I get rid of this sulfur smell? Are there certain foods I should be giving them to improve the smell? Right now...