Tiny Health, an Austin company that sells at-home microbiome testing, has raised a $33 million Series B led by B Capital, bringing total funding to $46 million.

Spero Ventures, The Venture City, Overwater Ventures, Black Opal Ventures, Denver Ventures, Pave Health Ventures, Alumni Ventures, Gaingels and Pari Passu Ventures also participated.

From Infants to Adults

Tiny Health launched around infant gut testing, built by founder and CEO Cheryl Sew Hoy after looking for answers about her own family.

"What started as a solution for my own family has become the infrastructure for an entire industry," Sew Hoy said.

The company now offers gut and vaginal microbiome testing across the lifespan, using shotgun metagenomic sequencing paired with its own AI analysis. Adult testing volume has passed pediatric.

The Numbers

Tiny Health reports roughly 200,000 customers and more than 6,000 healthcare practitioners using its results. Its B2B platform, Powered by Tiny, grew fourfold year over year.

"Tiny Health has built the platform best positioned to bring that science... to patients, providers, and partners at scale," said Nick Whitehead of B Capital.

Where the Money Goes

The funding goes toward clinical research, practitioner education, scaling the B2B platform, accelerating its TinyAI work and a $5 million Microbiome Research Program.

That research spending is the notable line. Microbiome testing has faced persistent criticism that consumer results outrun the underlying evidence, and funding studies is the direct answer to it.

MedCity News covered the raise as funding to expand microbiome testing.

Why It Matters

Selling tests directly to consumers is a different business from becoming part of clinical care, and Tiny Health is trying to move from the first to the second. Practitioner adoption and the B2B platform are the bridge.

Whether microbiome data changes what a clinician actually does, rather than adding an interesting report, is the question the research program has to answer.

Source

GlobeNewswire — "Tiny Health Raises $33M Series B to Establish Microbiome Intelligence as the Standard of Care"