If your vision has deteriorated, joint pain has appeared, your teeth have become sensitive, most likely you are experiencing a lack of vitamin D. Because of this, calcium and phosphorus are not absorbed, which can cause other health problems: headaches and muscle pain , insomnia, circulatory problems, sclerosis, osteoporosis and even cancer. How much vitamin D is needed to be healthy? How to prepare and store food without destroying its vitamin content? And why is too much vitamin D dangerous? You will find answers to all questions in the book. Attention! The information contained in the book cannot serve as a substitute for medical advice. You should consult with a specialist before taking any recommended action.