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Corrections are the ones we most want to hear about. If something on this site is wrong, out of date, or reads as stronger than the evidence supports, tell us and we will check it against the source. Our corrections policy explains what happens next.

General questions about a guide, its sources or how we reached a conclusion are welcome. Business and media enquiries are fine here too.

We read everything. We cannot promise a reply to every message, and we will not answer questions about your own health or what you should take.

Please note: Nth Health cannot provide individual medical advice.