There is no scientifically recognized standard for a "healthy" microbiome, which means the results of commercial home tests cannot be reliably translated into action. An international consensus statement from 2025 explicitly concluded that these tests are not suitable for dietary or supplement advice. For specific gastrointestinal complaints, a doctor using validated diagnostics offers more reliable guidance.
The test itself is completely safe -- sending in a stool sample does no harm. What matters is what you get back: a list of bacterial species, but without a scientifically recognised standard for what 'healthy' looks like, because such a standard simply does not exist. An international consensus statement from 2025, drawn up by experts in the field and published in a leading medical journal, concluded that these kinds of at-home tests are not suitable to rely on when making dietary or supplement choices. The result can also change based on what you ate the day before, or on minor differences in how the sample was collected.
That is not to say microbiome research amounts to nothing -- serious science is being done in this area. But the step from 'which bacteria are in this sample' to 'and therefore you should eat or take this' is one that no commercial provider can currently back up scientifically. You are essentially paying for a description that you cannot reliably translate into action.
If you are simply curious about your gut bacteria and do not mind spending the money, there is no medical reason not to do it. But if you have specific digestive complaints, a doctor is the more useful route -- not because a medical visit is obligatory, but because a doctor can deploy validated diagnostics.
Limited evidence, 1 source(s); treat with caution.