Half of the stuff in a supplement score is either too specific for the general population or just plain BS (protip: the more over the top the name is - I dunno, "Drol-mass-max" or something - the more BS it is)

Then you have the dietary macronutrient supplements (Protein, Omega 3, etc), the multivitamins and the specific functional foods.

Your "good diet" is probably lacking some micronutrients (some websites or fitness trackers allow you to set your diet and they will show exactly what's missing related to the guidelines) so I'd rather go with multivitamins (or at least Vit D)