The D3 confusion came about as I have been figuring out the "vitamin D-like" mechanism of the nightshades I first heard of from Dr. Childers of www.noarthritis.com
. I've heard too many positive clinical results from supplemental D3 (and avoiding nightshades) to continue recommending avoiding it.
I think Carlson's is fine. The lower Vitamin A is a good thing, IMO.
Taking A & D with fat is a good idea. The "X-factor" in the butter oil is now theorized to be Vitamin K, which would further synergize with the other fat-soluble vitamins.
I use the Green Pastures Blue Ice Gold Therapeutics (CLO + a little butter oil) because the combination is already taken care of.