Vitamin B12 active
Vitamin B12 performs several important functions in the body to keep the nervous system healthy. Deficiencies in vitamin B12 may cause extreme tiredness, a lack of energy, muscle weakness and problems with vision.
Ferritin is a blood protein which contains iron and is used to understand how much iron your body stores.
The main role of vitamin D is to help regulate the absorption of calcium, phosphate and magnesium. Vitamin D is vital for the growth and health of bone; without it, bones would be soft, malformed and unable to repair themselves normally. For most people, the majority of vitamin D is formed following the action of sunlight upon the skin but is also found in a small amount of foods.