Well, if you are super organised with your diet and buying expensive stuff like blueberries, walnuts, sardines, grass-fed meats, organic veg of wide varieties and you have good knowledge of nutrition, then diet alone can do it. However, the caveat is that most people either don't really understand it properly or have schedules, eating patterns, bad food choices, or say something like budget constraints that often limit their wide-spectrum nutritional intake. In this case, then a few supplements are probably effective and worth it, such as acerola cherry vitamin C (not absorbic acid ones), vitamin D (although vitamin D acts more like a hormone than a vitamin), magnesium glycenate, omega 3, B-complex, and maybe zinc for men... those would be the basic ones to take if you were to. There are others for if you have a specific concern or think a deficiency is present or want to boost phytonutrient intake... but most multivitamin pills have such low levels of each thing they claim to contain that at best they will only fend off a serious deficiency, assuming your absortion rates are normal. What most people are often unaware of is the bioavailability of the differing forms of a mineral or vitamin etc... for example, zinc chelate is way more absorbable than zinc oxide, and the same goes for many of them. Also worth mentioning, that herbs and spices are different beast which cab be more benefitial, and things like taking tumeric with black pepper increases effectiveness in absorption.
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