Iron 40mg prevent anaemia and boost energy levels 100 vegi tabs of 40mg iron to boost energy levels stop that washed out feeling and increase mental alertness iron is an essential mineral that forms part of haemoglobin the oxygen carrying component of blood unfortunately iron is one of the most commonly deficient amongst women children vegetarians and vegans iron deficient people very often feel weak and tired this is because their bodies are being starved of oxygen as they are not