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Is there an optimal daily dose of vitamin D for immune function? | Roger Seheult
Vitamin D doses
What Vitamin D Does to Your Immune System
How Much Vitamin D3? | The OPTIMAL Dose of Vitamin D3 Is...
The PERFECT Vitamin D Supplement Dose
How Much Vitamin D Do I Need? SURPRISING
Vitamin D: Is It SAFE to Take 10,000 IUs a Day? | Dr. Steven Gundry
Immunity Boosting Video #2 Do You Need Vitamin D Supplements for Immunity?
Top 5 VITAMINS that SPEED UP Muscle Growth
Vitamin D Dosage and Levels Advised
High Dose Vitamin D Treats Incurable Diseases?
Vitamin D Dosage and Levels Advised