Seek Emergency Services if you have any of these rare life threatening reactions: Severe allergic reactions (rash
Fish, meat, poultry, eggs, milk and other dairy products are good sources of vitamin B12 Clams and beef liver are some of the richest sources of vitamin B12 Some breakfast cereals and non-dairy milks (soy, oat, etc.) are fortified with vitamin B12 If the body does not have enough vitamin B12 then you may experience symptoms such as fatigue, pale skin, headaches, low mood, stomach issues, difficulty concentrating, inflammation of mouth and tongue, pins and needles, muscle weakness, or impaired coordination
When it comes to B12, that might actually be true
Maintenance doses are given less often than initial doses