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Phyllosan was an energy-boosting supplement and revitalising dietary tonic that was popular from the 1930s through to the 1950s. It was marketed heavily in newspaper, magazine, television and radio advertisements with the slogan ‘Phyllosan fortifies the over-forties’. Though it had largely disappeared from shelves by the 1980s, the slogan remained a well-known part of popular culture. In Trog’s cartoon, Prince Charles celebrates his 40th birthday with a dose of Phyllosan.