Need some schooling on vitamins and supplements please?

i used to take all the vitamin crap also ... i seen a heart doctor because a heart monitor said i had a heart attack ... it lied ... so the cardiologist set me straight ... only thing you really need is a silver centrum a day and eat a balanced diet .... silver centrum does help.... if i were to suggest something.... start taking essential oils .. i have been taking a shot of orange juice every morning with a drop of thieves oil and yet to have a cold in years ..... essential oils work PERIOD ...