Two-Thirds of the Species in Your Gut Have Never Been Studied

Roughly two-thirds of the species in the human gut were unknown to science until recently. Hidden bacteria like the CAG-170 group turn out to matter for health. The probiotics on store shelves have not caught up, which is why deep sequencing reveals what a label cannot.

Here is a number that should be more famous than it is. Around two-thirds of the species living in your gut were, until recently, completely unknown to science. Not understood poorly. Not studied lightly. Unknown.

How much of the gut is still a mystery?

Most of it, by headcount. As sequencing technology improved, researchers kept finding species no one had ever cataloged. The recent discovery that hidden bacteria like the CAG-170 group are a fundamental part of human health gave a sense of the scale of what is still out there, a whole hidden microbiome waiting to be mapped.

Why does the unknown part matter?

Because the unstudied species are not just filler. Some of the groups now linked most strongly to staying healthy are ones that went unnamed for decades. If a large share of your gut has never been characterized, then any health picture built only from the famous bacteria is working with a fraction of the data. The interesting answers keep turning up in the parts that used to be invisible.

Why are store-bought probiotics behind?

The probiotic aisle has not kept pace with the research. Many products still rely on the same handful of bacterial species that were in use decades ago, chosen back when those were the only microbes we could grow and study. The science moved. The shelf mostly did not. So a generic probiotic is a reasonable guess from an older era, applied to a gut it has never actually looked at. One of the biggest reasons for this has been the fact that there is no one-size fits all probiotic for everyone which has meant industry is less interested in pursuing products that would be costly and difficult to define and create. 

What does deeper sequencing change?

It replaces the guess with a reading. The Gut Microbiome Program from Dayhoff Health uses shotgun metagenomic sequencing, which reads the full genetic content of your sample instead of checking for a short list of known names. That depth is what lets it surface the obscure, recently discovered groups that off-the-shelf advice has no way to account for. You see your gut as it is, including the parts the supplement industry has not reached.

Two-thirds of your gut is frontier. Worth using a map that includes it.

Frequently Asked Questions

How much of the gut microbiome is unknown?

Roughly two-thirds of gut species were unknown to science until recently.

Why does that matter?

Some of the species most linked to health were unnamed for decades, so partial data misses them.

Are store-bought probiotics outdated?

Many use the same species in use for decades and do not reflect your individual gut.

What does Dayhoff Health do differently?

Its Gut Microbiome Program uses shotgun metagenomic sequencing to read the full content of your sample, including obscure groups.