Evidence standards
Four levels, honestly awarded – even if the result means 'unsatisfactory'.
As of: 1.8.2026
What counts as a source
- · Peer-reviewed studies, systematic reviews and meta-analyses.
- · Guidelines from professional societies and medical organisations.
- · Specialist literature that summarises the current state of research.
- · No: blog posts, podcasts, coaching providers, testimonials.
How we classify
- · Strong: consistent findings from multiple controlled studies or meta-analyses.
- · Moderate: positive, but small sample sizes, fluctuating effects, or different population.
- · Emerging: plausible, individual studies, not yet confirmed.
- · Unsatisfactory: not published as a recommendation.
Every method shows its level directly within the content. Details are available in the science section.
Corrections
If a finding changes or we were mistaken, we will correct the content and note the date. There are no silent changes to factual statements.