Effective dose
Most Useful Review
22 people found this helpful
My lab tests confirm this works! I started on a low dose of Vitamin D and needed to increase it to 30,000 IU per day to achieve optimal levels. Now, with 10,000 IU daily, I'm at a perfect level and crucially, I haven't caught a cold in the year I've been using this product. The gels are small, easy to swallow, and a great price.