The inception of the World Anti-Doping Code (WADC) and the implications of strict liability now mean that an athlete is held responsible for any Prohibited Substance in their system as a result of using a supplement even if they claim not to have been aware of the associated risks of contamination.

Athletes in the UK are strongly advised to be cautious about the use of any supplement.  No guarantee can be given that any particular supplement, including vitamins and minerals, ergogenic aids, and herbal remedies, is free from Prohibited Substances.

For athletes consuming a normal, varied and balanced diet, that meets their energy requirements, there is limited evidence that vitamin and mineral supplementation is necessary to enhance health or performance.