Hmm, says to take vitamin D instead of going outside. But every time somebody tries to show some benefit to vitamin D supplementation, they utterly fail. (Covid resilience might be the only exception, if confirmed.) Something about being outside does whatever good correlates with high vitamin D, but we don't know what.

Similarly, every attempt to demonstrate any benefit of fish oil supplements fails miserably. There is something really good about eating oily fish, but it is evidently not the oil.