They are particularly beneficial for vegetarians and vegans (since B12 is found primarily in animal products), older adults with reduced absorption capacity, individuals with digestive conditions such as Crohn's disease or celiac disease, and anyone who has had gastric bypass surgery
That was the safer decision from a warning perspective
Methylcobalamin is the most active form of Vitamin B12, which is better absorbed and utilized by the body (most Vitamin B12 injections are Cyanocobalamin-the cheapest, synthetic form of Vit B12)
In addition to fatigue, a deficiency of B12 can lead to other symptoms like pale skin, headaches, depression, gastrointestinal problems, difficulty concentrating, decreased mental function, mouth and tongue pain or inflammation, and paresthesia in your hands and feet
Refrigerator space for reconstituted vials