Correction follows three steps: (1) confirm the deficiency, (2) identify the cause, and (3) implement a sustainable repletion plan. Symptoms alone are unreliable; lab testing helps avoid unnecessary or harmful supplementation. Causes are not limited to low intake—malabsorption, heavy sweating, diarrhea, renal losses, blood loss (iron), pregnancy/lactation, restrictive dieting, and medication effects can all contribute. Repletion then combines dietary upgrades with targeted supplements when indicated, choosing the right form, dose, and duration, followed by monitoring. For example, iron status is best tracked with ferritin and related measures; magnesium form may be selected based on gastrointestinal tolerance; and prolonged high-dose zinc can disturb copper balance. A pragmatic approach is “test → targeted intervention → retest,” with timelines individualized to severity and etiology.\n\nSource note: NIH ODS mineral fact sheets (safety, interactions, repletion considerations).