Write to the notebook

The quickest way to reach us is by email at [email protected].

What helps us most

• Corrections. Tell us the page, the sentence and the source that shows it is wrong. We fix errors and update the page's date.
• Studies we missed. A link to the paper, ideally on PubMed, is all we need. We read it before changing any grade.
• Changed prices or terms. Sellers change plans often; a note that a price has moved lets us re-read the seller's page and update ours.

What we cannot help with

We are not clinicians, so we cannot answer questions about your own hair loss, your test results or your medicines, and we cannot tell you whether a product is safe for you. Those questions belong with a doctor, dermatologist or pharmacist who knows your history. If you think a supplement has made you unwell, stop taking it and contact a doctor; in the US you can also report a problem with a dietary supplement to the FDA through its Safety Reporting Portal.

Brands and partners

If you represent a brand we cover, you are welcome to send published studies or label changes. We do not accept payment for coverage, grades or placement, and we do not publish sponsored reviews.