EndoAxis gives its formulas numbers rather than names, and Formula 19 is one of them. The numbering reflects how the range is used: every formula is designed to be matched to a pattern a practitioner identifies on functional lab testing, not picked for a single concern.

EndoAxis began in 2023 as a practitioner-built platform for reading lab results, and the formulas grew out of it. Its founders include naturopathic doctor Guy Citrin and Microbiome Labs co-founders Tom Bayne and Kiran Krishnan, with naturopathic doctor Liz Bartman as chief medical officer.

Formula 19 sits in the Optimize group on the label and comes as 180 gelatin capsules in a glass bottle, which EndoAxis uses across the range in place of plastic. It is made in a GMP-certified facility, with ingredients checked for heavy metals and contaminants, and made without corn, soy or wheat. The capsules are gelatin, so it is not suitable for vegetarians.

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