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2. Vitamin D 101 — A Detailed Beginner's Guide - Healthline

   www.healthline.com/nutrition/vitamin-d-101

   Vitamin D needs to undergo two conversion steps to become active ( 8, 9 ). First, it is converted to calcidiol, or 25 (OH)D, in your liver. This is the storage form of the vitamin. Second, it is ...

3. Signs, Symptoms, and Side Effects of Too Much Vitamin D

   www.healthline.com/nutrition/vitamin-d-side-effects

   The symptoms of vitamin D toxicity are primarily related to hypercalcemia, which means excessively high blood calcium levels ( 8 ). Symptoms of hypercalcemia include: digestive distress, such as ...

4. Vitamin D: Benefits, Sources, Deficiencies - Healthline

   www.healthline.com/.../benefits-vitamin-d

   1. Vitamin D may fight disease. In addition to its primary benefits, research suggests that vitamin D may also play a role in: Reducing the risk of multiple sclerosis (MS). A 2018 review of ...

5. Tips for Vitamin Dosages for Older Adults - WebMD

   www.webmd.com/healthy-aging/what-to-know-about...

   How to Get Enough Vitamin D As an Older Adult. Adults aged up to 70 years old should be getting at least 600 IU. Adults older than 70 should be getting at least 800 IU of vitamin D. However, some ...

6. Vitamin D Deficiency: Causes, Symptoms & Health Risks - WebMD

   www.webmd.com/diet/vitamin-d-deficiency

   Vitamin D is essential for healthy bones, & a lack of it can lead to health problems, including cardiovascular disease. Know how to get plenty of vitamin D & treat deficiency.

7. How Much Vitamin D Is Too Much? The Surprising Truth - Healthline

   www.healthline.com/nutrition/how-much-vitamin-d...

   Summary. The UL for vitamin D is 4,000 IU per day. While vitamin D toxicity usually happens with very high intakes of 10,000+ IU per day, experts suggest that even amounts less than the UL could ...