Heirloom vegetables grow more slowly and spoil much more quickly than modern crops. This is because modern crops have less nutritional value - https://jeroenvanbaar.substack.com/p/data-dispatch-4-the-falling-nutritional
That article recommends eating a better diet. Sure. Seems a bit idealist. Here's some more actionable advice: everyone should take a multivitamin and magnesium glycinate. If you live somewhere that gets a winter take vitamin D too.
I'm speaking from experience here, I used to get sick every winter and my skin would get so dry it would crack and bleed. Take your vitamins.
Only a portion is a absorbed for sure https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6683096/
That is why magnesium pills tend to be big. It's wasteful I guess but it's your bodies fault
Are there any countries that do serious biomedical science based regulation of vitamins? I've heard that for most people who are eating a varied diet and aren't facing, like, idk, a diet made up of one or two elements or grown in severly depleted soils vitamins aren't necessary.