Sources and methodology

Where our information comes from

We prioritise systematic reviews and meta-analyses, then randomised controlled trials, then observational studies. We use PubMed, the Cochrane Library and official nutrition bodies.

How we weigh evidence

• Strong: consistent findings across multiple controlled trials or meta-analyses.
• Moderate: some controlled trials with mixed or small effects.
• Early: lab, animal or single small human studies.

Product comparisons

Comparisons are based on published label information. We note where nitrate content is not disclosed.

Corrections

Spotted an error? Use our contact page and we'll review it promptly.