I took pantothenic for a while but It was not helping me. I still take it once in a while though.
The intolerance t cold that you mentioned, what is it exactly that you feel? i have this very unpleasant sensation in my legs that it feels like goose bumps when i feel cold...its painful. I know when my skin is very sensitive because anything cold I touch, it will trigger the unpleasant sensations but only in my legs.

The same sensations I used to feel as a kid when I was out playing in the snow for too long and my feet got frozen/numb and began to hurt (just short of getting frostbite)—but now it can happen indoors on a cold day with my socks & slippers on.

One thing I've found is how important it is to keep our feet dry during this weather. Our (everyone's) feet sweat normally. Sweating is the way the body cools itself by evaporative cooling. When the weather is cold, we tend to dress more warmly, which can cause our feet to sweat even more. The evaporation causes our feet to cool down more than other parts of our bodies. When coupled with low/poor circulation, this can result in cold feet! keeping feet dry—especially in cold weather, can keep them warmer and less painful.

Doc