What it does: Helps to form healthy bones, cartilage, tissues and nerves, stabilises blood sugar, promotes healthy cells, essential for reproduction and red blood cell synthesis, required for brain function.

Deficiency Signs: Muscle twitches, childhood growing pains, dizziness or poor sense of balance, fits, convulsions, sore knees, joint pain.

Best food sources: Watercress, pineapple, okra, endive, blackberries, raspberries, lettuce, grapes, lima beans, strawberries, oats, beetroot, celery.