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A method of supplementing a normal diet with the aid of pills, nutritional drinks etc. containing vitamins, nutrients and oils.
In theory, a balanced diet should provide all the bodies nutritional requirements, but some people burn off vitamins more quickly than others, and some may have absorption defects that create nutrient deficiencies. Stress, smoking and alcohol also deplete nutrients.
The jury is still out as to what percentage of nutrients the body absorbs in this artificial form - it could be much passes straight through and money spent on supplements is largely wasted.