Michael Greger: Friday Favorites: Vitamin D Tested for COPD, Heart Disease, Depression, Obesity, and Cancer

Key Takeaways

• Take vitamin D if you have COPD – it improves lung function, walking distance, and reduces flare-ups.
• Skip vitamin D for ICU patients – trials show no mortality benefit.
• Don’t rely on vitamin D for heart disease prevention – focus on diet changes instead.
• Use vitamin D (2,000-4,000 IU/day) if you have colorectal cancer – it reduces progression and death by 30%.
• Consider vitamin D for major depression (but not prevention) – all trials showed benefit over placebo.

Supplements & Protocols Mentioned

• Vitamin D: 1,200 IU/day for lung cancer (only effective if starting levels <20 ng/mL)
• Vitamin D: 2,000-4,000 IU/day for colorectal cancer survival

Notable Quotes

“Among those starting out with D levels under 20 nanograms per milliliter… 86% remained in remission and 91% remained alive.”

“Vitamin D supplementation imparts a 30% reduction in bad outcomes overall for colorectal cancer.”

Bottom Line

Use vitamin D strategically for COPD, colorectal cancer, and depression treatment (not prevention), but don’t expect benefits for heart disease, obesity, or ICU outcomes without addressing root causes.

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