Anaemia:

Anaemia is where the red blood cells don't get enough of their nutrient, hemoglobin, and can't transport enough oxygen. Your cells need oxygen to function. Thus you can become extremely fatigued.

Since this is usually related to an iron deficiency, drinking unsweetened beet and/ tomato juice every day may help. Be sure to get enough sun as well.

Alive tablets from Nature's Way have iron, folic acid, B12, and natural nutrients galore for treating anameia: