A client consumes a varied diet and regularly takes an over-the-counter multivitamin. They ask whether continuing the supplement is likely to prevent any deficiencies. Which analytic statement is the most accurate?

A multivitamin taken with a varied diet immediately causes mineral deficiency within days by displacing dietary minerals from absorption sites, so supplements should be discontinued to avoid deficiency.

A varied diet usually supplies most micronutrients; a multivitamin may provide insurance for some people but targeted supplementation is preferable for diagnosed deficiencies—continued use is reasonable but monitor for excess of fat-soluble vitamins and minerals like iron if not needed.

If someone eats a varied diet, taking any additional micronutrient always doubles their nutrient stores safely and cannot cause harm, so lifelong high-dose multivitamin use is universally recommended.

Multivitamins are never useful for anyone on a varied diet because the body will automatically excrete any additional nutrients, and supplements therefore have no physiological effect at all.