loveof dogs, in addition to the B12 shots also look into thiamine (vitamin B1). It, like vitamin D, needs magnesium to become bioactive. Do you take a magnesium supplement? The krispin offers a formula for daily magnesium needs and also has a list of causes of magnesium loss. Activated thiamine in turn is needed to activate vitamin B6. The B vitamins work better together. A fat soluble thiamine form called benfotiamine can be used with a B Complex and offers high absorption advantages over water soluble forms. Thiamine can be diminished or destroyed by anti thiamine factors. The stuttersence link contains a comprehensive list. Thiamine is critical for brain, vagus nerve and gut function. You will be rewarded learning about how they use thiamine. Always consult your health care professional before using any supplement.
https://sperlingmedicalgroup.com/lack-of-vitamin-b12-can-cause-tremor-symptoms/#:~:text=However%2C%20tremors%20and%20other%20movement,occur%20even%20in%20mild%20deficiency.
http://stuttersense.blogspot.com/2014/08/these-factors-reduce-your-thiamine.html
https://www.krispin.com/magnes.html

I have never posted before but I've had internal vibrations in my legs for over 10 years now. When they first started it felt like a cellphone was vibrating in my left back thigh/ knee area. Eventually it spread to both legs. I have them 24/7. The only thing my blood work has ever revealed is very low vitamin d. First doctor lady I saw (11 years ago) told me to eat those over the counter chocolates that are vit d fortified. I think she thought she was doing me a favor, but I'm not big on chocolate and maybe only ate one tub of it if I even finished the tub. About a year and a half ago I saw a new doctor and totally forgot to tell him about the vibrations as I had other symptoms that were more distressing at that time. Choking sensation in my throat. Blood work again only revealed very low vit d. He put me on prescription vit d, 50,000iu once per week. I took that faithfully for an entire year as prescribed. I've done so much of my own independent research and saw a video on YouTube by Dr. Berg in which he said tremors can some times be caused by low vit B12. I bought MaryRuths vitamin b complex and I have to say I have noticed a ton of improvement. I have also since discovered that if I run for an extended period, say a mile and a half, that my vibrations are significantly diminished. I still have the vibrations but they are so faint that they don't bother me like they used to. B12 and b vitamins in general are supposed to be good for nerves. I believe this is either a nerve issue or an upper cervical issue. Dietary changes, exercise and supplements have all helped me to get where I am at now. Anyway that was long but I think you're on the right path with vitamin b12 as I've personally noticed it's help. Apologies for the long post!

Thanks for the reply. I have tried B12, but not on a regular basis. Will try that. I’ll just take high doses for a week or two and see if it has any effect. No help for me. I will have to live with my issues for now since I’m getting blocked by every avenue I try to get a diagnosis. I’m just thankful that it’s not worse. I feel for those people going through health issues that are not getting resolutions.