A big question many people have is how to get enough vitamins in their diet. Many vitamins occur naturally in food, and vitamin B12 is one of them. However, B12 is mostly found only in animal products, so if you do not eat a lot of or any of those, you will need to supplement with fortified cereals or daily vitamins or even injections. Adults and children can suffer from various medical issues if they have a deficiency of b12, so it is important to know the daily amounts needed and also how to get vitamin B12 in your system if it is low.