Vitamin B12 is probably the best known among the B complex vitamins because many people take B12 injections as a treatment for severe pernicious anemia. People who exhibit signs of weakness may be diagnosed with a B12 deficiency and a simple regimen of introducing Vitamin B12 in some other form may greatly help reduce the symptoms. If a true deficiency exists, the person may also have... https://owlkoreastore.com/product/detail.html?product_no=121&cate_no=1&display_group=3