Tomatoes, carrots, parsnips, cauliflower, salads, swede, mushrooms,peppers, onions, pears, walnuts, scrambled eggs with smoked salmon on wholewheat toast, beetroot is good-beetroot juice was used as a blood builder for patients that were pale and rundown. In Russia and Eastern Europe it is still used to build up resistance and to treat convalescents after a serios illness. 1 carrot can give you all the vitamin A you need for an entire day.
Kiwifruit is also good as its high in potassium but low in sodium..and almost twice as much vitamin c than an orange. Green peppers will give over 100mg of vitamin c .. Over 3 times the daily RDA- best eaten raw in salads.
It is a vicious circle in some ways because people who suffer from tiredness often lack the energy for exercise.... Without which the bodys ansorption of iron and other vital minersls is poor, leading to even less energy.
If greens are not ate, or fruit n veg are linited in your diet then you may wish to consider supplements.