Vitamin B deficiency – what are the key symptoms? Dietary sources of B vitamins
Kacper Nowak
2026-05-19
4 min. read
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Vitamins represent essential organic compounds that play a pivotal role in sustaining the body’s homeostatic processes, including metabolic reactions, neurotransmitter synthesis, and tissue repair mechanisms. The B-vitamin complex is particularly critical for regulating nervous system function, which in turn influences psychological stability and cognitive performance. Inadequate intake of these vitamins may result in neurological dysfunction, impaired concentration, or even depressive disorders. Furthermore, B vitamins facilitate cellular energy metabolism, bolster immune responses, and contribute to the integrity of skin and mucosal membranes. Prolonged deficiency poses significant health risks, underscoring the importance of recognizing symptomatic manifestations and dietary sources of these micronutrients.
Vitamin B deficiency
B vitamins support the nervous system and are catalysts for important biochemical reactions. Their proper levels have a positive effect on mental function and mood, as well as protecting others from anemia. They are difficult to overdose and to store in the body for longer.
Symptoms of vitamin B deficiency
Symptoms of vitamin B1 deficiency Anorexia nervosa or rapid weight loss A lack of appetite Appetite of the large intestine Symptome of vitamin C2 deficiency Digestive problems such as diarrhoea Nervous breakdown Fatigue Reduction of short-term memory impairment Muscle weakness Changes in mood Heart problems The effect of extreme B1-deficiency of the brain can lead to heart disease (muscle dysfunction, heart disease, heart failure) Symptomes of vitamin D-2 deficiency Disorders of the digestive system, such as blood pressure, brain fatigue, blood pressure and blood pressure Reducing the concentration of blood pressure in the spinal cord Blood pressure and heart failure Reduced blood pressure can cause changes in the blood pressure around the nose, spinal column, blood flow in the mouth, or swelling in the arteries.
What products contain vitamin B?
Food source Vitamin B1 (tiamin) Grain products (grilled beans, oatmeal, rice), meat and poultry, leguminous vegetable seeds (peas, beans and legumes) It also occurs in potatoes, yeasts, legumes, Brazil nuts, seeds, sunflower and sesame seeds. B2 (green beans) Grains of dairy products (milk, natural yoghurt, animal legumes and kefir), eggs, flour, whole grain legumes.
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