5000 i.u. supplementally on a daily basis is the optimum for good health, plus sunshine! Throw in some B complex, 2000 mg.s C, 400 i.u. E , CoQ 10 and some Vitamin K3 should supplement the average healthy lifestyle American.
Eat organic, avoid gmo’s ( corn, soy, alfalfa and all other Monsanto tainted seeds) You should be good to go with a good probiotic, these diseases live in your gut..a.k.a. “leaky gut syndrome”.
I do take a B complex as well, per my neuros orders.
The rest of it I’m not going to get into a discussion on an online forum about. You can find as many different suggestions as you can people, so let suffice it to say, I do what I think is right for me, as I’m sure you do for yourself. :)