What Sufferers Have Worked Out: Citizen Science and Community Knowledge

Source: Chapter 4 in full (revised 13 August 2026 by its own follow-up research pass). Section numbering and the part’s own reference list retained from the source chapter.

What the patient community has worked out for itself: the organised community, its data, the threads it identified before formal science did, and where community and clinic agree or diverge.

Revised 13 August 2026: a targeted follow-up research pass resolved several items flagged as open questions in the original version of this chapter — including the outcome of the vitamin D3 RCT, the current status of the Australian PEACE trial and the BOL-148/Ceruvia programme, a correction to the EPOCH trial’s framing, and a language-by-language check of non-English patient-community citizen science. Updates are marked inline and summarised in the revised “Open Questions & Loose Threads” section at the end.

Cluster headache (CH) is a condition where the patient community has, in several documented instances, outrun formal medicine — not by accident, but through organised, semi-structured self-experimentation, data-sharing, and advocacy that pre-dated (and in the psychedelic case, directly caused) academic research programmes. This chapter treats that body of community knowledge as data, labelled honestly by evidentiary tier, alongside the peer-reviewed literature it has generated.