Nick NorwitzMD PhD, Oxford-Harvard | Metabolic Health Educator | “Stay Curious”

This Natural Molecule Might Be the Next Antidepressant

18 Oct 2025 · 1 min

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1:00

In this explainer, the speaker discusses a recent Cell Metabolism study that links lower circulating levels of homovanillic acid (HVA)—a dopamine‑related hormone—and reduced HVA‑producing gut bacteria to depression in patients. The study demonstrated that administering HVA directly or supplementing with gut bacteria that generate HVA alleviated depressive‑like behaviors across several animal models and behavioral tests. Because HVA can cross the blood‑brain barrier, the findings suggest that future probiotic formulations or HVA‑based treatments could become viable strategies for treating depression and possibly other mental‑health disorders. The video concludes by encouraging viewers to consult the study notes for detailed methodology.

Chapters

What if a probiotic cocktail could treat depression? That's the big question behind a new study published in Cell Metabolism. Researchers found that patients with depression had significantly lower levels of a circulating hormone and neurotransmitter called homovanillic acid, or HVA for short, a cousin of dopamine, as well as fewer gut bacteria responsible for producing it. And here's where it gets exciting. In animal models of depression, actually multiple animal models, treating with either HVA itself or the gut bacteria that support its production reduced depressive symptoms across multiple animal models, multiple tests, and with again the gut bacteria or direct administration of HVA, this hormone that actually can cross the blood-brain barrier. So it might not be long until we have experimental or proven probiotic cocktails for depression and other mental health disorders. For more nuanced information, see the notes.