Supplements to help erectile dysfunction?

Does anyone know of supplements/vitamins that actually work for men with ED? My fiancé has it but he won’t go see a doctor. He keeps telling me he will and he won’t. He has a very busy schedule so that’s kind of his excuse for not seeing a dr yet and also I think he’s embarrassed. Also not sure if his insurance would cover that. He does know how much it means to me to have a healthy sex life and how upset this all makes me.

Anyway. I was hoping there was something I could order online or get at the store, any help?