Tā chuīxū zìjǐ de mìfāng shì xiàndài bǎn qīfǎndān.
He brags his secret recipe is a modern-day elixir of immortality.
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A staple of Daoist alchemy and wuxia fiction. 七返 = refined seven times (the more cycles, the more potent). Close cousin of 九转金丹, another fabled longevity elixir from the same alchemical tradition.