All About Serotonin

Serotonin does far more than regulate mood — 90% of it is made in your gut, not your brain. In this episode, Nurse Doza breaks down exactly what serotonin does, why so many people are unknowingly depleted, and how to naturally restore levels through gut health, B vitamins, sunlight, and targeted supplementation.   FEATURED PRODUCT Bliss by MSW Nutrition Serotonin production depends on methylation — and if your methylation pathways are sluggish, you can be doing everything right and still come up short. Bliss is a lemon-flavored sublingual powder featuring TMG (trimethylglycine), a powerful methyl donor that directly supports the methylation reactions your body needs to synthesize serotonin and dopamine. As discussed in this episode, the MTHFR gene, B vitamins, and SAMe are all essential cofactors in serotonin production — and Bliss is formulated to address exactly that gap. Just place it on your tongue and let it absorb in seconds. One serving a day is all it takes. 👉 Get Bliss here: https://mswnutrition.com/products/bliss   JOIN THE SCHOOL OF DOZA If this episode opened your eyes to the gut-serotonin connection, imagine going even deeper. Inside the School of Doza, you'll find a full MTHFR course that explains exactly how your genetics affect your ability to produce serotonin, dopamine, and other neurotransmitters — and what you can do about it. Whether you're dealing with anxiety, mood swings, poor sleep, or brain fog, you're not alone in that journey. Our community is full of people working on the same root causes, and every Wednesday we host a live group consult (Ask Me Anything session) where you can bring your questions and get real answers — just like a private consultation, but with a room full of people who get it. 👉 Start your free trial: https://community.schoolofdoza.com/c/start-here     5 KEY TAKEAWAYS 90% of serotonin is made in your gut — not your brain. If your gut health is compromised, your serotonin production is compromised. Depression, anxiety, and mood disorders often have a digestive root cause that standard care rarely addresses. Gut dysbiosis — from antibiotics, processed foods, dairy, and poor diet — disrupts the bacterial enzymes and cofactors (like 5-HTP and TPH1) that your microbiome uses to synthesize serotonin. Healing the gut is foundational to healing the mood. Serotonin converts to melatonin at night. If you're low on serotonin, you're also likely low on melatonin — which explains why gut problems, depression, and insomnia so often travel together. B vitamins — especially B6 (P5P), B9 (methylfolate), and B12 — are essential cofactors for serotonin synthesis. MTHFR gene variants impair the methylation pathway that drives this process, making methylated B vitamins and methyl donors like SAMe critical for many people. Sunlight and exercise are among the most powerful natural serotonin activators. Combined with gut repair, B vitamin support, and targeted supplementation like Bliss, these lifestyle inputs can meaningfully shift your serotonin baseline without relying solely on medication.   TIMESTAMPS 00:00 – START – Welcome and episode overview   02:00 – Serotonin 101: what it is and why 90% is made in your gut   03:48 – School of Doza spotlight: the MTHFR course   06:46 – Serotonin and depression: what we've gotten wrong   09:08 – The gut microbiome: good bacteria, bad bacteria, and neurotransmitter production   11:31 – Antibiotics, 5-HTP, and how your gut makes serotonin   13:56 – Food, dairy, and diet choices that wreck your gut microbiome   16:23 – Why SSRIs alone aren't enough — and what to do instead   17:28 – Serotonin converts to melatonin: the gut-sleep connection   20:00 – The insomnia-depression-gut triangle   21:05 – B vitamins and methylation: essential cofactors for serotonin   23:18 – MTHFR, the liver, SAMe, and Bliss by MSW Nutrition   25:30 – The 5th factor: sunlight, exercise, and a full serotonin reset protocol   28:21 – Bliss — sublingual methylation support for serotonin and dopamine   RESOURCES Serotonin Overview — Cleveland Clinic — Comprehensive guide to what serotonin is, what it does, and how it affects the body. https://my.clevelandclinic.org/health/articles/22572-serotonin   Gut Microbiota and Serotonin Synthesis — ScienceDirect — Peer-reviewed research on how gut bacteria directly influence serotonin production, kynurenine pathways, bile acids, and vitamin cofactors. https://www.sciencedirect.com/science/article/pii/S2950194626000142   Serotonin to Melatonin Conversion — PMC/NIH — Research on the biochemical pathway by which serotonin is converted into melatonin, including the role of SAMe as a cofactor. https://pmc.ncbi.nlm.nih.gov/articles/PMC8659113/   B Vitamins and Neurotransmitter Synthesis — PMC/NIH — Research on how B6, B9 (folate), and B12 act as rate-limiting cofactors in serotonin, dopamine, GABA, and melatonin production. https://pmc.ncbi.nlm.nih.gov/articles/PMC4772032/   🔗 Connect with Nurse Doza JOIN MY SCHOOL for FREE: https://community.schoolofdoza.com/c/start-here YouTube: https://www.youtube.com/channel/UCwcKyagDi468WscAOWM5VHA Instagram: https://www.instagram.com/nursedoza/ Website: http://www.nursedoza.com/ LinkedIn: https://www.linkedin.com/in/jonathan-mendoza-dc-aprn-np-c-0609a038/ TikTok: https://www.tiktok.com/@nursedoza Twitter: https://twitter.com/nursedoza