7 Eye-Opening Facts About Vitamin D You Never Knew

Oct. 30, 2023 by Ava Green

7 Eye-Opening Facts About Vitamin D

7 Facts about Vitamin D You Never Knew

Vitamin D, often hailed as the "sunshine vitamin," plays a crucial role in our overall health. However, there's more to this nutrient than meets the eye.

Today, we delve into the intricacies of Vitamin D deficiency and some little-known facts that could significantly impact your understanding and management of this essential vitamin.

The Consequences of Vitamin D Deficiency

A deficiency in Vitamin D can lead to a myriad of health issues, including:

  • Compromised Immune System: Weakens your body's defense against illnesses.
  • Inflammation: Contributes to chronic inflammatory conditions.
  • Sleep Issues: Affects your sleep quality and patterns.
  • Digestive Problems: Disrupts gut health and digestion.

Surprising Causes of Vitamin D Deficiency

Vitamin D deficiency can stem from various causes, some of which are lesser-known:

  • Gut Inflammation: Hinders Vitamin D absorption.
  • Missing Gallbladder: Affects fat absorption, including fat-soluble vitamins.
  • Skin Factors: Thicker and darker skin types synthesize less Vitamin D from sunlight.
  • Obesity: Excess body fat can sequester Vitamin D, making it less available.
  • Diabetes and Insulin Resistance: Impact Vitamin D utilization.
  • Geographic Location: Living further from the equator means less sun exposure.
  • Genetic Factors: Certain genetic variations can affect Vitamin D metabolism.
  • Infections: Can deplete Vitamin D levels.
  • Fatty Liver: Impairs Vitamin D storage and release.
  • Smoking, Sugar, and Stress: Negatively affect Vitamin D levels.
  • Statins and Low-fat Diets: Can interfere with Vitamin D synthesis.
  • Pollution: Reduces sun exposure and, consequently, Vitamin D synthesis.
  • High Omega-6 Intake: May disrupt Vitamin D balance.

Eye-Opening Facts About Vitamin D

  1. Magnesium's Role: Many side effects post-Vitamin D supplementation might be due to a magnesium deficiency, highlighting the interplay between these nutrients.
  2. Dosing Frequency: Infrequent but larger doses of Vitamin D could be more effective than small daily doses.
  3. Source Matters: Farm-raised fish and grain-fed animals have significantly less Vitamin D compared to their wild-caught and grass-fed counterparts. Outdoor roaming chickens and pigs have higher Vitamin D levels than those confined indoors.
  4. Vitamin D3's Impact: Ranked as the third biggest factor improving overall health (source).
  5. D3 vs. D2: Vitamin D2 can inhibit the absorption of D3 and worsen conditions like MS. It's ineffective in reducing mortality or helping with lupus, while D3 may be beneficial (source).
  6. Sun Exposure: Just ten minutes in the sun can provide about 400 IU of Vitamin D, though this varies based on skin type, location, and other factors.
  7. Supplement Ingredients: Many Vitamin D3 supplements, particularly in Europe, contain corn syrup.

The Rarity of Dietary Vitamin D

Obtaining sufficient Vitamin D from diet alone is almost impossible. The stark contrast in Vitamin D levels between wild and farm-raised fish, as well as grass-fed versus grain-fed animals, further complicates dietary intake. This reality underscores the importance of considering supplementation and safe sun exposure to maintain adequate Vitamin D levels.


Vitamin D is more complex than commonly thought. Understanding its intricate dynamics, from surprising causes of deficiency to the nuances between D2 and D3, can be pivotal in managing your health. Armed with these insights, you can make more informed decisions about Vitamin D and its crucial role in your overall well-being.

This article not only provides fundamental knowledge about Vitamin D deficiency but also introduces lesser-known yet crucial facts that could change the way we view and manage Vitamin D in our daily lives.


  1. "Vitamin D is the 3rd best way to improve your health but the most cost-effective," VitaminDWiki, January 2022. Source
  2. "Overview Vitamin D3 not D2," VitaminDWiki. Source