Torreya Seed Classic Formulas … Natural Herb Library

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Expels intestinal parasites ... Fei Zi is best known as a seed medicine for roundworm and related intestinal parasite patterns, especially when abdominal discomfort and poor appetite coexist.
Moistens the intestines and eases bowel movement ... its oily seed nature supports use in dry constipation rather than in damp or loose-stool patterns.
Moistens the Lung and helps relieve cough ... traditional use also preserves a smaller Lung-facing lane for chronic dry or deficient cough.

Parasite-clearing combinations with Shi Jun Zi or Ku Lian Pi ... traditional strategy when worms, abdominal discomfort, and poor intake travel together.
Bowel-moistening seed pairings with Huo Ma Ren or similar oily medicinals ... used when dryness and difficult stool are more central than heat purging.
Lung-moistening food-medicine use ... a smaller classical lane for cough and dryness rather than a major resuscitative or blood-moving application.

Traditional herbology records Fei Zi as a sweet, seed-based medicinal that kills parasites, moistens the intestines, and can assist cough from dryness.
Its reputation as both edible and medicinal helps explain why it remained a practical household-level herb in some regional traditions.