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We reply to questions within 1–2 business days

Questions about the guide, a correction to something we published, or a partnership request: use the address below.

General & Editorial

Order support is handled by the seller, not by us. If you have already placed an order and need to check its status, change an address, manage a subscription or request a refund, contact the seller support address printed on your order confirmation email. They hold your order record; we do not.

What We Can Help With

Questions about the guide and the routines published on this site
Corrections and source requests
Media, research and partnership inquiries

What We Cannot Help With

Order status, shipping or tracking: see Shipping Policy
Refunds, returns and subscription cancellations: see Refund Policy
Individual medical questions, dosing advice or drug interactions: these belong with your physician or pharmacist

Response Times

We answer email Monday through Friday. Messages sent on weekends and US public holidays are answered the next business day.