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A vitamin belonging to the B complex group.
It's necessary in the human body for the formation of blood cells, so is particularly Important for the development of infants and unborn babies (particularly in the prevention of neural tube defects, such as spina bifida).
Its best sources are found in green leafy vegetables (particularly beet greens, kale and spinach), fortified breakfast cereals, nuts and pulses, whole grains and liver.
Although our requirements are low, folic acid is essential for growth, and the production of red blood cells - so lack of it causes anaemia.