One can suspect of having vitamin B 12 deficiency if you are constantly feeling lethargic and having nausea along with stomach upset.
No, you are recommended to check with a doctor before taking vitamin B12.
Vitamin B-12 is synthesised and utilised by bacteria in the human gut microbiome. However, not substantial research is done to establish the same statement.
Vitamin B12 is naturally present in foods of animal origin, including fish, meat, poultry, eggs, and dairy products. In addition, fortified breakfast cereals and fortified nutritional meals.
The role of vitamin B 12 is very crucial as without enough red blood cells, your tissues and organs don't get enough oxygen. As a result your body cannot work well. You will suffer from weak musles, numbness and extreme fatigue.You are recommended to check with a doctor. You can either take cynocobalmin tablets or hydroxocobalamin injections to boost your vitamin B12 levels. In addition take a protein rich diet comprising of dairy, poultry and meat to increase your B12 naturally.