Let Food be thy medicine. -> So because Minerals+vitamins, etc yadda yadda are Necessary, & we know... Next... to Noone gets enough minerals anymore, then more & MORE ... of whatever else... must be better.
But in Nature, we do Not eat an Entire truckload of (whatever) to make up deficiencies. - No, we (tend our gardens) in God's Sunshine until early afternoons, when later we could end-up burned, to a crisp.
People do Not understand. They think Any ole dose... (of whatever) is good. Not so.
Unless you get a BASEline of where you're at preferably late winter, you have No clue what you're doing. - Now the ama & pharma do know what they're doing, so they tell people Vit. D levels 30 ng/mL are 'considered' normal. Only a fool would trust a damn thing they tell you, let me repeat that: "only a fool".
Optimal Vit. D levels 80 to 100 ng/mL.
Again, a Baseline is good, or once yearly for a few years - by that time you will have figgered out the rest... of what you need & "how well you are functioning" - iow the Energy of a Little child-on-the-Go... got it?
Re "on 10,000 IU of vitamin D per day for 6 months. That's a LOT, but somebody else takes double that for far longer and is fine."
what form of D ? , please define "fine" = No overt sxs? = Tested blood level for both kinds?
I was doing research for my book, when search showed 'Communities.win' - the positive & curious critter latched unto the win-part, & too this "Win uses cookies, which are essential for the site to function. We don't want your data, nor do we share it with anyone." - & started teaching in u/Positive & u/Health & u/diy
Another 1 with ZERO clue.