Vitamin B12 or cobalamin is a water-soluble nutrient, found primarily in animal foods. By water-soluble, it means that the vitamin can dissolve in water and travel through the bloodstream. Surprisingly, the body can store vitamin B12 for up to 4 years, however, one can still be deficient of it at some point in life.

from Times of India https://timesofindia.indiatimes.com/life-style/health-fitness/health-news/vitamin-b12-deficiency-beware-of-these-two-sensations-in-your-feet/photostory/92356384.cms