Donkey Skin Classic Formulas — Natural Herb Library

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Serves as the source material for preparing E Jiao - Lv Pi is historically important mainly because processed donkey-hide gelatin is made from it.
Provides the raw collagen-rich animal material behind later blood-tonic preparations - any nourishing interpretation is usually mediated through cooked and refined gelatin rather than through stand-alone use of raw hide.
Functions more as a medicinal raw material than as a commonly prescribed independent herb - direct clinical usage literature is much thinner than for E Jiao itself.

E Jiao preparation traditions - Lv Pi is the essential raw material from which donkey-hide gelatin is produced before inclusion in blood-tonifying and bleeding-stabilizing formulas.

Historical and trade references treat donkey skin primarily as the source material for E Jiao rather than as a richly developed independent ben cao category.
Because of that, modern interpretation of Lv Pi necessarily remains more conservative and more source-focused than the interpretation of E Jiao.