Sources
Health claims link to an identifiable source. We favour primary research, public-health bodies and technical standards over press releases.
Editorial standards
How we research and publish.
Our guidance should be useful, traceable and honest about uncertainty. These standards apply to every research-based article and directory profile.
Context and limits
Population, country, method and outcome stay attached to a finding. Association is not rewritten as causation.
Types of evidence
Research findings, expert interpretation, lived experience and editorial perspective are not presented as the same kind of evidence.
Expert review
Current guides are editorial summaries with linked sources, not independently expert-reviewed publications. When a qualified reviewer is appointed to a piece, their name, relevant expertise and review date must appear on that piece.
Images and generated media
Images illustrate ideas unless identified as a documented property or case study. The homepage entrance and garden films, and the Air and Circadian Harmony journey scenes, are generated architectural concepts. They do not depict documented properties or demonstrate health outcomes. Company imagery is attributed on its directory profile. A person shown in an image is not presented as an advisor or contributor.
Commercial relationships
Ownership, funding, gifts, supplied access and paid work are disclosed close to the content they may affect.
Corrections and updates
Material corrections are dated and explain what changed. New evidence can trigger a review without erasing the earlier record.
Corrections and updates
When the evidence changes, the record changes with it.
Factual errors are corrected as soon as they are verified. A note records any change that materially affects the reader’s understanding.
Challenges to a claim are assessed against the same standard, whether they come from a reader, expert, company or contributor.
Browse the evidence sources