Articles
Gut Health, Lab Testing and Practice Insights from RSN Institute

How to Start Running Functional Labs | State Laws & NPI

Learn how to start running functional labs, understand state laws, get an NPI, choose lab providers, and stay within scope when working with clients. ...more

Functional Nutrition

August 17, 2026•15 min read

How to Read a Stool Test: A Practitioner's Guide to GI-MAP, Gut Zoomer, and Real Root-Cause Protocols

Learn how to read GI-MAP, Gut Zoomer, and GI Effects stool tests, interpret key gut health markers, avoid common mistakes, and build better protocols. ...more

Testing ,Gut Health &Functional Nutrition

August 10, 2026•26 min read

My Client's Labs Are Normal, But They Still Feel Terrible. What Is Missing?

Normal labs but persistent symptoms? Learn why standard testing misses dysfunction, which markers get overlooked, and how functional practitioners fill the gap. ...more

Functional Nutrition

July 15, 2026•6 min read

Do Clients Need Functional Testing, or Can They Just Guess With Supplements?

Supplements without testing is guessing. Learn why functional testing turns symptom-chasing into clinical reasoning, with B12 as a working example. ...more

Functional Nutrition

July 15, 2026•5 min read