I think we can benefit from supplments and food as sources.

If I lived in the land of my ancestors, then my fair skin was an asset, and much food came from fish from the sea. Fish was everyday fare. That would have been my source of vit D. I also learned my fathers fathers family came from an island off Italy, which means fish everyday, too.

It is not questionable when the product I use really makes me feel better. And for the first time I am looking forward to winter. For the first time I know I will not just endure it, but live it. All thanks to vitamin D supplements.

Magnesium. The world over is deficient, by 80%. U.S. by 40-6O%, depending on which study is quoted. We supplement because brain malfunctions are showing up in my family. Magnesium is a critical brain nutrient. And it is deficient in most agricultural land. I looked at adding it to my soils but realized taking a supplenent was far far cheaper than special amendment for 15 acres. Bet commercial producers only apply what provides a heavy crop of perfect veg and fruit.

(When my sheep needed foot dip, it was magnesium based so the used dip was dumped around the peach trees, which need a lot of magnesuim.)

Studies. I dont throw the baby out with the bath water. Especially NIH work. I use my science background, and look for what is reliable in fo. And do a bit of homework on supplement companies.

For example. Dr Amen highly recommended L - tyrosine to boost dopamine. I tested a bottle of capsules on myself with noticeable results. Then son trialed a bottle. Good effect. This was evidence to see a specialist to officially diagnose ADD. This was them same person that ciuld see the Aspergers but didnt see the ADD. I diagnosed my son. Doctor just put her stamp on it and opened the door to Ritalin, Concerta and other methylphenadate based treatments.

Zinc is also a big player. Requires eating liver and oysters daily to get RDA. Most people prefer pills, we do all three. Oysters are $1 each, liver everyday us boring, and zinc in a muti-vit is cheap.

PS. Commercial livestock get their vitamins and mimerals from " a pill" not their feed.