Ingredient Information
Summary
Vitamin D2 (Ergocalciferol) is one of the two main forms of vitamin D, the other being vitamin D3. It is a fat-soluble vitamin that supports bone health, immune function, and muscle performance by aiding calcium and phosphorus absorption. Vitamin D2 is derived from plant sources such as fungi and yeast, making it suitable for vegetarians and vegans. People who may benefit from vitamin D2 include those with limited sun exposure, individuals following plant-based diets, or those at risk of deficiency. Supplementing with vitamin D2 helps maintain normal bones, teeth, and immune system function.
Key Facts
- Type: Fat-soluble vitamin
- Natural source: Mushrooms, yeast, fortified foods
- Typical supplemental dose: 10–25 µg (400–1,000 IU) per day
- Used for: Bone health, immune support, muscle function
- First discovered: 1920s (isolated during rickets research)
What Is Vitamin D2?
Vitamin D2, also called ergocalciferol, is a form of vitamin D produced when ergosterol (a compound found in fungi and yeast) is exposed to ultraviolet light. Unlike vitamin D3, which is typically sourced from animal products or synthesised in the skin after sunlight exposure, vitamin D2 is entirely plant-derived, making it suitable for vegan supplements. In the body, it is converted into calcidiol in the liver and then into calcitriol, the active form of vitamin D, which regulates calcium and phosphorus balance for bone and muscle health.
How It Works In The Body
Vitamin D2 is absorbed in the small intestine and converted into its active form through a two-step process in the liver and kidneys. The active form helps increase the absorption of calcium and phosphorus from food, ensuring normal bone mineralisation and strength. It also plays a role in supporting immune system activity and maintaining normal muscle function. While both vitamin D2 and D3 are effective, D3 is considered slightly more efficient at raising and maintaining vitamin D levels in the body.
Safety & Interactions
- Vitamin D2 is generally safe when consumed within recommended amounts.
- Excessive intake may lead to vitamin D toxicity, with symptoms including nausea, weakness, and high blood calcium levels (hypercalcaemia).
- People with medical conditions affecting the kidneys or parathyroid glands should consult a healthcare professional before supplementation.
- Vitamin D2 may interact with certain medications such as steroids, weight-loss drugs, or anticonvulsants, which can reduce its effectiveness.
- Pregnant and breastfeeding women may require additional vitamin D, but dosage should always be discussed with a healthcare professional.
Always consult your health practitioner before taking nutritional supplements, especially if you are taking medication or are under medical supervision. You should not take supplements as a substitute for a varied balanced diet or healthy lifestyle.
FAQs
What is the difference between Vitamin D2 and D3?
Vitamin D2 is plant-based and suitable for vegans, while D3 is usually animal-derived and slightly more effective at raising vitamin D levels.
Who should take Vitamin D2?
People following vegetarian or vegan diets, those with limited sun exposure, or anyone at risk of deficiency may benefit from vitamin D2 supplementation.
Can you get enough Vitamin D2 from food?
Food sources of vitamin D2, such as mushrooms exposed to sunlight, are limited, so supplementation is often necessary to meet daily requirements.
References
1. https://pubmed.ncbi.nlm.nih.gov/23386645/
Comparison of vitamin D2 and D3 in raising serum vitamin D levels.
2. https://ods.od.nih.gov/factsheets/VitaminD-HealthProfessional/
NIH fact sheet on vitamin D, including functions, sources, and recommended intake.
3. https://pubmed.ncbi.nlm.nih.gov/21872800/
Vitamin D and its role in bone health, muscle function, and immunity.
Our products that contain Vitamin D2
Where next?
Information on this page is for educational purposes only and is not a substitute for personalised medical advice. Always consult a healthcare professional before making dietary changes or starting new supplements.