Without doubt, the best source for vitamin D is the sun. If at all possible, Plan to spend part of every sunny day out-of-doors. Even when it’s not direct sunlight there will still be a benefit and in addition, you will be exposed to the good which comes from nature. Vitamin D reduces the production of inflammatory substances called cytokines. These are chemical messengers which accelerate inflammation and tissue breakdown. In the absence of adequate vitamin D levels coronavirus damage will likely be accelerated.
Vitamin D is important for controlling infection and lowering your risk of pneumonia. While the information is not yet complete regarding resistance to coronavirus and its relationship to vitamin D levels it seems very likely that having high normal vitamin D levels will be protective against the development of serious complications. The Spanish flu of 1917 occurred during the winter when the vitamin D levels were at their lowest.
The best food sources of vitamin D3 are from fish whose natural diet in the wild is krill. Krill feast on algae which is rich in vitamin D and include:
- Salmon which has been wild harvested. Compared to farmed salmon, wild caught salmon contains at least four times more vitamin D (up to 1300 IU/serving). In addition, farm salmon has been found to contain very high amounts of toxic material which we believe makes it unsafe to eat.
- Herring and sardines provide 100 – 200 IU/serving
- Eggs, especially those which are free range in which the birds are able to be out-of-doors and eat green vegetables can provide 100 – 200 IU/egg.
- Cod liver oil is an excellent D3 source providing 300 – 500 IU/tsp.
Taking vitamin D3 as a supplement should also be helpful. Current recommendations would be to check blood levels first and then supplementn based on those findings however likely, due to timing, this is impractical thus 400 IU/day taken with meals would be a safe, and likely effective dose.