Acne vulgaris is a common skin condition which occurs predominantly on the face and to a lesser extent on the chest, shoulders and back. These areas of skin have the most sebaceous glands.

Anxiety is a group of conditions characterised by excessive fears and worries that may be difficult to control.

Respiratory tract infections can occur anywhere in the respiratory tract (i.e. the nose, throat and lungs). The infection can be caused by bacteria, a virus or even fungi.

A complex interplay of environmental and genetic factors is involved. Associated with an accumulation of damaged molecules and impaired energy metabolism.