All the Science You Need
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Questions

The practical answers

Formats, shipping, what a workbook actually is, and what these books are not. If something is missing, it is probably worth adding, so say so.

Choosing a book

Which book should I start with?
Take the seven-question quiz. It asks where you actually are and names one book plus the one that pairs with it. If you would rather not: pick the guide for your decade, and add its workbook only if you want to write things down.
What is the difference between a guide and a workbook?
A guide is a book you read through and come back to: the science, the mechanism, and what to ask a clinician. A workbook is a book you write in, one page a day, for 30, 66 or 90 days. Workbooks carry a seal on the cover with the day count. Most people end up with one of each.
Do I need to read them in order?
No. Each book stands on its own. The XX Longevity Bible is the widest of them and works as a first book or a last one; the This Is… guides are written for one decade at a time.

Buying and formats

Where can I buy them?
On Amazon, in paperback and Kindle editions. They are printed on demand, so your copy is produced and shipped from the facility closest to you rather than crossing an ocean.
Can I write in the Kindle edition?
No, and for the workbooks that matters. The daily pages are designed for a pen, with ruled space and a scoring row that an e-reader cannot reproduce. Buy the paperback for any workbook. The Kindle edition of a workbook is best treated as a reading copy of the method.
Are the books available in other languages?
Not at the moment. The series is English only. If that changes, the list below is where it will be announced first.
Do you sell signed copies, or direct from this site?
No. Everything is printed on demand and sold through Amazon, so there is no warehouse here to sign a copy in or ship one from.
What size are the books?
Five by eight inches, small enough to carry, which is the point for a workbook you are meant to open every day.

Using the workbooks

What happens when I finish the 30, 66 or 90 days?
Each workbook ends with something to carry forward rather than a blank wall: a Courage Contract, a Re-Entry Ramp for the day two misses stack up, or a clinician-conversation kit built from your own data. Nothing about them assumes a perfect run.
Can I use one with a group, a book club, or clients?
Yes, and they work well that way. The weekly reviews give a group a natural meeting point. Each person needs their own copy, since the pages are written in.

The science

Are the claims sourced?
Yes, to the primary research: the trial, the guideline or the population study itself, never to another popular book. Where a number has a spread, the spread is printed next to it. Sixty-six days is a median; the range ran from 18 to 254, and the workbook says so.
Is any of this medical advice?
No. These are educational books. They cannot know your history, they do not create a clinician relationship, and they are not a substitute for care from someone who does know you. Where a book suggests raising something with your doctor, that is the actual recommendation.
Who writes them?
Dominik Duscher, MD, a plastic surgeon and stem-cell researcher focused on tissue regeneration and women’s health, and Friederike Seiler, a computational biologist and former vice dean of a private medical university in Europe. More about both.

What’s next

Is another book coming?
Yes. A Brain Fog Workbook is in production. Joining the list below is the only way to hear when it lands.