Known as the “sunshine vitamin”, vitamin D is an incredibly important nutrient for overall health. It helps to: Support the immune system (key for preventing infection). Maintain normal bones and teeth (helps to prevent rickets in children and bone pain in adults). Maintain normal muscle function (important for day-to-day activities as well as exercise). Low vitamin D levels can cause vitamin D deficiency, which occurs when your body doesn’t have enough vitamin D. Symptoms of vitamin D deficiency include: Tiredness and fatigue. Muscle weakness and discomfort (including muscle cramps). Bone pain. Mood alterations, including depression. Some people may have low vitamin D and not experience any symptoms. Therefore, it’s important to check your vitamin D levels with a Vitamin D Test Kit - especially if you live in a part of the world that doesn’t get much sunlight. It can tell you what your vitamin D levels are so that you can manage your health and take a vitamin D supplement if you need to.