NEKTON-B-Komplex is a supplement that helps repair deficiencies, has a positive effect on nervous tissue, and improves the regulation of protein, fat and carbohydrate metabolism. When your bird lacks essential B vitamins, it can lead to various health problems. These problems may include nervous system problems (such as bending the head back), increased irritability, difficulty with coordination, or muscle spasms. You may also notice abnormal skin changes or growth disturbances, which can be signs of vitamin B deficiency.