The short answer is, yes. Because of current agricultural practices soil has become deficient in basic vitamins and minerals and, as the saying goes, you are what you eat and you are what you eat ate!
The refined flours and oils and canned and fried foods that make up many American’s diets do not contain enough vitamins and minerals to even meet the RDAs (Recommended Daily Allowances). Fruits and vegetables, which most people don’t consume enough of already, lose many vitamins on their trek from farm to table and are lacking in minerals because of over-farming.
The RDAs were not established to help achieve optimal health. They are merely the amount of nutrients necessary to prevent a deficiency plus a safety factor of two or three. To put it simply, the RDAs were never designed to achieve optimal health and performance. RDAs are minimum wage nutrition.
Those who exercise regularly have a much higher need for supplemental vitamins and minerals to replenish what’s lost during exercise and ensure their body’s are functioning optimally at the cellular level.