You’re adding too many unhealthy stuff
What is a marinade to you? As we said, you need acidic elements, spices and oil, but many people add A1 sauce, artificial flavorings and weird ingredients, like tenderizers, that might not be that healthy.
Think of your meat as a white canvas you want to paint with all-natural flavors and no chemicals, additives or preservatives.
Ditch the ready-made marinades packed with nitrates and stuff, go natural instead. Your guests will thank you.