Contact Chris Masterjohn, PhD

I offer several ways to contact me, depending on the nature of your request.

For a Rapid Personal Response (Within 3-4 Days)

Until recently I have been focusing very narrowly on completing my book. However, the coronavirus (COVID-19) crisis has turned things upside down and I am at present focusing very narrowly on COVID-19 research, in the hopes of soon getting back to finishing my book. Therefore, I am responding extremely slowly to comments on most social media. I am responding consistently, however, about 3-5 days a week, to comments on the Vitamins and Minerals 101 Facebook post, the pre-order announcement, and to questions in the Vitamins and Minerals 101 Premium Facebook group (sign up here), and in the CMJ Masterpass (sign up here, and use the code CONTACTME for 10% off). If you aren't a Masterpass member and you didn't pre-order the book, please ask your question on the Vitamins and Minerals 101 Facebook post, the pre-order announcement, the What I'm Doing for the Coronavirus Facebook post, the  The Food and Supplement Guide for the Coronavirus Facebook post, or the Free COVID-19 Research Updates newsletter.

Proposals and Suggestions

These will be triaged, and you may get a rapid response if your inquiry is deemed very important by my customer support team, but your inquiry may also get saved for later (as in most topic requests) or ignored (as in inquiries that use the wrong form, or business proposals that do not have high relevance):

Product Questions

These will be answered by my customer support team if they are submitted in the correct category:

Technical Support

For technical support, please email my support team by adding “support” and “@” to the domain of my web site.

Please do not email my support team with specific questions about health and nutrition. These should be left as comments in one of the places mentioned above under “Leave a public comment.”

Suggest a Topic for Me to Cover!

Suggest an Improvement

Use this form to suggest what I could do better to make the site more useful or user friendly, or to suggest products I should be offering that I currently do not.

Media Inquiries and Business Proposals

Questions About “Testing Nutritional Status: The Ultimate Cheat Sheet

First, please visit the cheat sheet page and read the description and frequently asked questions if you have not already done so.

Please note that this form is not for general questions about testing nutritional status. Please submit any such questions as topic requests.

If you are interested in buying the cheat sheet and have a question that I haven't answered on the main page, then please use this form to contact me:


Questions About the CMJ Masterpass

If you are interested in the CMJ Masterpass and have a question that I haven't answered on the main page, then please use this form to contact me: