There are numerous free websites and blogs that can assist in researching global health law. Some of these resources are listed below, and at right.
The World Health Organization (WHO) is the world's most prominent health-related IGO. The WHO plays a major role in the promulgation of global health law agreements--both "hard" (binding) and "soft" (non-binding). These agreements are listed below. Non-WTO health-related agreements can be identified via the United Nations Treaty Collection site (keyword and subject searches). See also under "Basic Documents-Treaties of International Health Law" in the 2010 GlobaLex piece "Research Guide on International Health Law."
See also JUSTIA's BlawgSearch lists for "International Law" and "Health Care Law." DipLawMatic Dialogues, the blog of the American Association of Law Libraries' Foreign, Comparative, and International Law Special Interest Section, occasionally posts contributions related to global health law. See, e.g., Amy Flick's "From the Reference Desk: Researching African Health Laws" (August 21, 2018).