Yòu zhēn xiān shēng fú nèi yuán qì jué 幼真先生服內元氣訣

Master Yòu zhēn’s Instructions on Consuming the Inner Primordial Pneuma

attributed to Yòu zhēn xiān shēng 幼真先生 (“Master Youthful Perfection”); Táng

A Táng-era qì cultivation manual on the consumption of inner primordial qì (fú nèi yuán qì 服內元氣) — the internal variant of the more common fú qì 服氣 practice. Preserved as DZ 828 / CT 828.