The possibility of depression, stress and mental disorders increases due to a decrease or increase in the lack of vitamins and nutrients in the body.... Vitamins such as vitamin D and B12 and omega 3 fatty acids are more related to depression and can lead to mental disorders.... Maintaining a balanced diet rich in essential nutrients and paying attention to the very positive effect of vitamins on mental health and maintaining mental health and stress has a very positive effect.. Stress ** The effect of vitamin deficiency on depression and stress is a well-established issue, and diet and vitamins can affect issues such as mood, sadness, and irritability. Deficiencies in certain nutrients may put people at greater risk for depression. These nutrients can include deficiencies in vitamin D, B12, and B9, and omega-3 fatty acids. Depression and mental disorders caused by nutritional deficiencies are rare in the recommended countries. D on depression and stress** Vitamin D plays an important role in mental health, especially stress and depression. Research suggests that vitamin D deficiency may be associated with an increased risk of depression and mood disorders. Vitamin D receptors are found in areas of the brain involved in mood regulation, and adequate levels of vitamin D are necessary for the production of neurotransmitters such as serotonin. It may help mental health and potentially reduce symptoms of stress and depression. It may vary, so it is recommended to consult a specialist to get the best results from vitamin supplements... ### **Omega-3 Fatty Acids** Omega-3 fatty acids, especially EPA and DHA, have been noted for their many benefits on mental health, especially stress and depression... Omega-3 fatty acids are essential for brain function and have anti-inflammatory properties that may help reduce symptoms of depression and anxiety... Treatment of depression without drugs is possible by improving vitamin levels in the body... ### **Effect of vitamin B12 on depression and stress** Vitamin B12 is essential for maintaining nerve function and red blood cell production, and low levels of this vitamin can increase the risk of depression and stress.. Vitamin B12 plays a role in the synthesis of neurotransmitters such as serotonin and dopamine, which are important for mood regulation.. **Iron** Iron is one of the most important and vital substances for body growth, and its deficiency is a common disorder all over the world... which mostly occurs in women.... In severe cases, iron deficiency can turn into iron deficiency anemia (IDA) and lead to disorders in the production of red blood cells.... It has been shown in some studies; that iron deficiency can be effective in causing mental disorders such as depression, especially in pregnant women with low iron levels, the possibility of pregnancy depression is higher.... Taking iron supplements and foods rich in this nutrient can be effective in reducing the possibility of depression.... Iron-rich foods include red meat, fish, and chicken, and nutritionists recommend that adults avoid consuming between 8 and 8 milligrams of iron per day.. **Summary** Vitamins and nutrients are an important part of the substances needed to maintain the mental and physical health of a person.... Some vitamins cannot be obtained only by eating healthy foods, and in order to have a normal level of vitamins, food supplements must be used.... Some mental problems such as depression and anxiety can be caused by vitamin deficiency, and if you suffer from these problems, I will refer to nutritionists... **Frequently Asked Questions** **1\_ The lack of which vitamins increases the possibility of depression and stress?** Vitamins D, B12, omega 3 fatty acids and iron and zinc are effective in mental disorders...