@celia16 Does she have fatigue? Low B12 can cause a decrease in oxygen getting to the muscles. Low D3 can also cause fatigue, but it can cause anxiety, which she has.

I wish I could talk to your mother because actually I agree with her concern. Taking D3 to get the calcium to the arteries does not get most of the calcium to the bones, Most of the calcium stays in the arteries and causes calcification. It takes vitamin K2 to get it to the bones. K2 is not new. Our ancestors had plenty of K2 when animals (chickens, cows) were on pasture. Now with the mechanized agriculture, they get little to none and so do we.

When I was in my early 70's (now approaching 80), I was "wiped out" and could not get out of a chair. I asked my wife to hand me the computer and I started searching what was happening. I found a Doctor who was the same way and couldn't walk. His fellow Doc's said he had MS ( No test for MS). He was able to determine that he had a B12 deficiency. To absorb B12 is a complicated process. Having B12 shots is one approach. I researched sublingual (under the tongue) B12 and that brought me back.

Since than I have been researching health and finding the "good, bad and ugly". I share your mother's concerns for not taking something that is going to hurt me. But I do want to get the right balance and not be an invalid.