Fuel/supplements

Hi everyone! I am training for nyc this fall and am just curious opinions on fueling/supplements.

We eat rather healthy, vegetarian, but I’m just curious how do I know if I should be taking any additional vitamins or supplements? I have seen people talk about doing meals with protein powders but also articles talking about how eating actual food is better.

What are some go tos prior to running or after? Food recommendations or supplements? Any advice is helpful I am just trying to learn and be as healthy as I can be. Thank you!