Personalized Vitamin D Levels Cut Repeat Heart Attack Risk by Half

Dr. Joseph Mercola - Take Control of Your Health

Briana Mercola

Health & Fitness, Alternative Health

4.6 • 1.5K Ratings

🗓️ 23 December 2025

⏱️ 7 minutes

🔗️ Recording | iTunes | RSS

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Summary

A new Intermountain Health study presented at the American Heart Association's 2025 Scientific Sessions found that adults with heart disease who optimized their vitamin D levels cut their risk of another heart attack by 52%
Most participants began the trial with low vitamin D levels, showing that deficiency is common in people with cardiovascular disease and silently increases the risk of recurring heart problems
More than half of the patients needed over 5,000 IU of vitamin D3 daily — six times the FDA's recommended intake — to reach protective blood levels between 40 and 80 ng/mL
Vitamin D acts as a hormone that helps lower inflammation, maintain proper calcium balance, improve blood vessel function, and reduce oxidative stress — all key to preventing heart damage
Regular testing, personalized dosing, sunlight exposure, and daily exercise are simple, measurable ways to restore vitamin D, strengthen your heart, and reduce your risk of another cardiac event

Transcript

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0:00.0	What if one number in your blood could cut your risk of another heart attack in half,
0:04.0	and you could change it yourself?
0:06.0	Welcome to Dr. Mercola's cellular wisdom.
0:09.0	Stay informed with quick, easy-to-listen summaries of our latest articles,
0:13.0	perfect for when you're on the go.
0:15.0	No reading required.
0:16.0	Subscribe for free at Mercola.com for the latest health insights.
0:20.0	Hello, and welcome to Dr. Mercola's cellular wisdom. I'm Ethan Foster. Today we're
0:25.6	looking at new findings on vitamin D and why optimizing your level may be one of the most
0:30.6	measurable ways to prevent a repeat cardiac event. I'll walk you through what the Target
0:35.8	D study tested, what actually changed outcomes,
0:39.0	and how you can apply the same approach. I'm Alara Sky. We'll keep this focused and practical.
0:45.6	You'll hear what ranges were targeted, how often levels were checked, why many people needed
0:50.5	higher than expected daily doses, and how sunlight, supplementation, and daily
0:55.9	habits fit together when your goal is fewer heart problems. The Target D trial followed 630
1:02.9	adults with established heart disease and a prior major cardiac event. One group received
1:09.0	standard care without vitamin D monitoring. The other had vitamin D levels
1:13.5	tested and doses adjusted at regular intervals to reach a defined target. The question was direct.
1:19.7	If you personalized dosing to hit a specific blood range, can you lower the chance of another heart
1:24.9	attack? Most participants started far below that target.
1:28.9	At baseline, 85% measured under 40 nanograms per milliliter. Traditional definitions call less than
1:35.3	20 nanograms per milliliter deficient and 20 to 30 nanograms per milliliter, but the focus
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