While many treaties had oral components that promised health and healthcare to Indigenous nations, this is the written portion of Treaty 6 that documents the 'medicine chest' clause:
"That a medicine chest shall be kept at the house of each Indian agent for the use and benefit of the Indians at the direction of such agent.... That in the event hereafter of the Indians comprised within this Treaty being overtaken by any pestilence, or by a general famine, the Queen, on being satisfied and certified thereof by Her Indian Agent or Agents, will grant ... assistance of such character or to such extent as the Chief Superintendent of Indian Affairs shall deem necessary and sufficient to relieve the Indians of the calumet that shall have befallen them."
From NCCIH's paper, The Treaty Right to Health: A Sacred Obligation.
Map of the numbered treaties.
"In many Crown-First Nation treaties and specifically the Numbered Treaties, there is reference to health care provisions. Referred to as a medicine chest in some cases or aid in others, this provision appears in written and oral versions of treaties... Regrettably, since those treaties were negotiated, Canadian federal governments have generally disavowed the fact that Indigenous people hold treaty rights to health."
From Covid-19, the Numbered Treaties & the Politics of Life, by Gina Starblanket and Dallas Hunt, for the Yellowhead Institute.
For more information about Treaties, see the Aboriginal Treaties research guide.