Hello @vicki127, Welcome to Connect, an online community where patients and caregivers share their experiences, find support and exchange information with others. I'm sure that Vitamin B12 is part of the puzzle, as well as Vitamin D and a few others. Here's some information that may help give you a better understanding of it's role.

-- Retardation of myelination due to dietary vitamin B12 deficiency: cranial MRI findings: https://pubmed.ncbi.nlm.nih.gov/9028851/
-- A vitamin supplement for remyelination: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4674287/
-- Supplements That Support the Myelin Sheath: https://www.livestrong.com/article/322041-supplements-that-support-the-myelin-sheath/
-- Analyzing the role of diet and exercise in myelin production: https://www.mayoclinic.org/medical-professionals/physical-medicine-rehabilitation/news/analyzing-the-role-of-diet-and-exercise-in-myelin-production/mac-20429394

Do you mind sharing what you were searching for when you found Connect?