The term natural health product (NHP) is used in Canada to describe substances such as vitamins and minerals, herbal medicines, homeopathic preparations, energy drinks, probiotics, and many alternative and traditional medicines. A 2010 survey showed that 73% of Canadians consume NHP on a regular basis. NHP are obtainable without a prescription and are required to be safe to be used as an over-the-counter product.
Health, as defined by the World Health Organization (WHO), is "a state of complete physical, mental and social well-being and not merely the absence of disease or infirmity." This definition has been subject to controversy, as it may have limited value for implementation. Health may be defined as the ability to adapt and manage physical, mental and social challenges throughout life.