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People don't spend enough time outdoors to generate a sufficient amount of vitamin D.

The idea is that if vitamin D improves outcomes for covid 19, and the stores are all out of the supplements, then you can go in your backyard instead.

Backyards are relatively uncommon in some places in America: lots of high-rises, many without balconies.

That, and there isn't enough sunlight in many places, and many people's bodies can't make enough Vitamin D with sunlight (and the body's ability to do so decreases as you age).

1. Time in Sun

2. Angle of Sun

3. Sufficient Cholesterol

Just 13 min and The time of day is critical.. the sun must be above 50' above horizon for UVB to penetrate the atmosphere to reach the skin. When your skin is exposed to sunlight, it makes vitamin D from cholesterol

https://theralightinc.com/best-time-to-get-vitamin-d-from-su...

https://www.healthline.com/nutrition/vitamin-d-from-sun#time...

My doctor told me genetics has a role too.

My dad is vitamin D deficient despite living in south Florida and being outside alot. And so am I (I live in Georgia).

https://blogs.scientificamerican.com/observations/vitamin-d-...