Claiming one vitamin “strengthens the heart” is more marketing than medicine; cardiovascular health is multi-factorial. That said, certain micronutrients can support heart and vascular function indirectly. Vitamin D deficiency is sometimes associated with unfavorable risk profiles, magnesium supports neuromuscular signaling and rhythm stability, and B vitamins play roles in homocysteine metabolism. The key principle is this: supplementation is most meaningful when a deficiency exists; unnecessary or unsupervised use can introduce risk rather than benefit. The best micronutrient strategy is food-first—vegetables, fruits, nuts, legumes, fish, and whole grains deliver a broad spectrum of supportive nutrients. If you suspect deficiency, confirm it via lab testing and build a targeted plan with a clinician or dietitian. Precision beats guesswork in cardiovascular prevention.