What are the major symptoms of vitamin deficiency?

It depends: Each vitamin is essential to your body for a different reason. A deficiency in one may have symptoms different than others. If you suspect a deficiency, speak to your physician. Most deficiencies, including vitamin d, can be addressed by a proper diet.

Depends: we need all our vitamins and minerals. It is important to eat slowly and to chew your food to optimize your body's ability to absorb the vitamins and minerals. Symptoms can range from fatigue, brain fog, tingling,palpitations etc. if you suspect a deficiency you should see a doctor and have the levels measured.