Red yeast rice, in particular, is a supplement that should be taken only under the supervision of a health-care professional.

CNN: How can I pick the healthiest brand of red yeast rice?

The new Premier League rule required clubs to name a squad of 25 senior players by 1700 BST, 1 September, with only players under the age of 21 allowed to supplement that line-up until January.

BBC: Premier League clubs name their 25-man squads

Arrangements were also under way to for arrangements with community pharmacies to supplement existing ways of collecting antivirals where needed.

BBC: Wales opting out of flu service

The supplement makers who engage in this type of sleight-of-hand often operate under cover of semi-anonymity.

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