Crude Sal Ammoniac Classic Formulas … Natural Herb Library

Primary Actions

Dissolves phlegm and softens hardness ... crude Nao Sha belongs to an old harsh mineral lane used for stubborn phlegm, nodules, and obstructive masses rather than for gentle daily tonification.
Breaks focal obstruction and disperses accumulation ... older formula traditions apply it in minute quantities when food stagnation, phlegm, and epigastric blockage are unusually stubborn.
Opens difficult swallowing and obstructive throat patterns in older specialty use ... this is part of the same penetrating, dissolving identity.
Appears in external corrosive applications for warts and thick lesions ... a reminder that this substance was never treated as a mild kitchen-like salt.

Xi Sha San and related obstruction-dissolving powder traditions ... older formulas use ammonium-chloride mineral material for difficult phlegm and blockage patterns.
Minute-dose phlegm and mass-dispersing combinations with Ban Xia or other transforming substances ... highly specialized use rather than routine prescribing.
Historical external applications for corrosive lesion work ... a traditional lane that requires real caution.

Older materia medica treats Nao Sha as sharp, penetrating, and potentially corrosive, emphasizing that processing and dose are safety-critical.
The substance's traditional reputation depends on dissolving, softening, and opening blocked patterns, not on nourishment or harmony.