Vitamin A, B2, B3 and biotin are also important for the maintenance of normal structure and function of the mucous membranes, with Vitamin A also occurring in the intestine and lungs.
Vitamins A and B2 stimulate the maintenance of normal skin and support the skin's regenerative capacity.  
 
Vitamins A, B2 also ensure the maintenance of a good iron level in the blood.
Vitamin A aids the normal functioning of the immune system, among other things, as do Vitamins B6, B12, C and D. 
Vitamins A, B2 help keep vision normal.
 
Vitamin B1 promotes your energy metabolism and helps to release energy from fat, carbohydrates and proteins. Together with Vitamins B2, biotin and B12, it plays a role in the activity of certain enzymes involved in energy metabolism.

Vitamin C promotes, among other things, your energy metabolism, which can reduce fatigue. The vitamins B2, B3, B5, B6, folate, B12 and C contribute to extra energy in case of fatigue.
 
Vitamin B1 contributes to the normal functioning of the heart.
Vitamin B6 contributes to normal cysteine synthesis and, together with folate and vitamin B12, has a role in the production and breakdown of homocysteine.
 
The normal functioning of the nervous system and psychological function has multiple areas: state of mind, learning performance, concentration, reasoning, memory and mental energy.

The vitamins B1, B6, biotin, folate and B12 are responsible for this. Vitamin B2 contributes to the support of the build-up of the nerve cells, and Vitamin B3 contributes to the normal functioning of nerves and the nervous system.

Vitamin B5 supports mental functions (such as concentration and memory) and state of mind; together with folate it contributes to resistance to stress; and it also contributes to normal synthesis and normal metabolism of steroid hormones, vitamin D and some neurotransmitters. Vitamin B6 contributes to mental resilience and folate is beneficial for good mental balance and energy.
 

Vitamin B2 contributes to the maintenance of normal red blood cells.
Vitamins B6 and B12 contribute to the normal formation of red blood cells, and folate contributes to the formation of red and white blood cells.
 

Vitamin B2 is an antioxidant and Vitamin E contributes to the protection of cells against oxidative damage. Biotin keeps your hair strong.
 
Folate plays a key role in amino acid synthesis. Like Vitamin B12 and Vitamin D, it is also involved in the cell division process (normal cell division, tissue growth and development, and the process of cell renewal). 
Folate contributes to the formation of the placenta and to the growth of the child during pregnancy.
 
Vitamin B6 contributes to the energy supply in the muscles (during training/sport (performance)), has a favourable effect on the production and combustion of proteins and carbohydrates and contributes to the regulation of hormonal activity.
 
Vitamin D promotes a normal/good calcium level in the blood, it increases calcium absorption in the bones and is important for teeth. Vitamin D also plays a role in maintaining flexible and strong muscles.