Ryetalyn was a mineral that was used to treat Rigelian fever. (TOS episode: "Requiem for Methuselah")

Planets where ryetalyn could be found included Holberg 917G and Cypria III. (TOS episode: "Requiem for Methuselah", TOS novel: Child of Two Worlds)

On occupied Betazed during the Dominion War, ryetalyn was in short supply. (TNG novel: The Battle of Betazed)

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