This is how you can increase mushroom's vitamin D content

Mushrooms are a nutritious and versatile food, often added to soups, salads, stir-fries, and even sandwiches. They are packed with essential nutrients such as fiber, antioxidants, and vitamins. One vitamin that many people don’t realize mushrooms can provide is Vitamin D. However, most store-bought mushrooms typically contain very low levels of this important nutrient. But there's a simple trick that can significantly boost the vitamin D content in mushrooms—exposing them to sunlight.


Understanding the Role of Vitamin D in Mushrooms
Vitamin D is an essential nutrient that helps the body absorb calcium, promotes bone health, and supports the immune system. It’s primarily obtained through sunlight exposure, as the skin synthesizes it when exposed to UV rays. While Vitamin D is found in certain foods, such as fatty fish, fortified dairy products, and eggs, mushrooms are one of the few plant-based sources of Vitamin D. However, the form of Vitamin D found in mushrooms is different from the one our bodies produce when exposed to sunlight. Mushrooms naturally contain Vitamin D2 (ergocalciferol), while human skin produces Vitamin D3 (cholecalciferol), which is the more effective form in raising blood levels of the vitamin. Nonetheless, Vitamin D2 still has health benefits, and the amount of Vitamin D in mushrooms can be significantly increased with a simple trick.


Sunlight Exposure
Mushrooms, like humans, have the ability to produce Vitamin D when exposed to ultraviolet (UV) light. The same way our skin produces Vitamin D when exposed to sunlight, mushrooms can synthesize it under UV light. This process is natural and very similar to how plants use sunlight for photosynthesis. By exposing mushrooms to sunlight or UV light after they’ve been harvested, you can significantly boost their Vitamin D content.


Here’s how it works:
Mushrooms and UV Light: When mushrooms are exposed to UV rays (like sunlight), they begin to produce more Vitamin D2. This happens because UV light converts ergosterol, a compound found in the cell walls of mushrooms, into Vitamin D2.

Optimal Exposure: To get the best results, mushrooms should be exposed to direct sunlight or a UV light source for a few hours. Even just 15 to 30 minutes of exposure can increase the Vitamin D levels in mushrooms by a significant amount.

How to Increase Vitamin D in Mushrooms at Home
If you’re growing your own mushrooms or buying fresh ones, here’s how you can increase their Vitamin D content at home:
Choose the Right Mushrooms: Start with mushrooms that have the potential to increase their Vitamin D content. Most common varieties, such as white button mushrooms, cremini, and portobello, can be enhanced with UV exposure. However, some specialty mushrooms (like shiitake) may already contain higher levels of Vitamin D before exposure.

Expose to Sunlight: Once you have your mushrooms, place them with their gills facing up in direct sunlight for about 15 to 30 minutes. Ideally, this should be done during the midday hours when the sun is strongest. You’ll notice that the caps of the mushrooms will face upward to absorb the UV light, helping them produce more Vitamin D.