Dr Ben Lynch

Folic acid doesn't just fail to help. It actively blocks the pathways folate is supposed to support. There are two places this matters most — your blood-brain barrier folate receptors, and the kidney enzyme that recycles folate back into circulation. Folic acid competes at both. So if you're eating well, avoiding processed food, even supplementing — but still relying on enriched grains or a supplement with folic acid — you may be blocking the very system you're trying to support. The form is not a minor detail. It determines whether folate actually reaches your brain and tissues or just circulates unmetabolized. If you have MTHFR, this matters even more.

Folic acid doesn't just fail to help your brain. It actively blocks the door. Folate receptor alpha is the primary transport into your brain for methylfolate. It's selective — it's supposed to let in the active form your neurons actually use. But folic acid binds to that receptor tightly. And it doesn't let go. So even if you're taking methylfolate, even if your diet looks clean — if folic acid is occupying that receptor, methylfolate can't get through. Your brain runs on this nutrient. Neurotransmitter production, myelin repair, DNA synthesis — none of it works without it. This isn't a minor inefficiency. This is a locked door.

Green tea isn't always the health win people think it is. If you have a DHFR deletion, the EGCG in green tea directly inhibits dihydrofolate reductase — the enzyme that converts dietary folate into a form your cells can actually use. During pregnancy, that pathway matters more than almost any other. Your developing baby's brain and neural tube depend on activated folate at critical windows. If DHFR is already compromised by genetics, adding a daily EGCG load on top of it isn't benign. This is why blanket "healthy eating" advice breaks down at the genetics level.

Green tea has real benefits. EGCG is well-researched and I'm not here to tell you to stop drinking it. But if you carry the DHFR deletion, there's something worth knowing. DHFR is the enzyme that converts dietary folate into a form your body can actually use. The deletion variant slows that conversion down. EGCG — the active compound in green tea — inhibits DHFR. If your DHFR is already running slow, you're adding an inhibitor on top of it every morning. Then layer in folic acid from a multivitamin or fortified food, and now that sluggish enzyme has even more to process — with less capacity to do it. This doesn't mean green tea is harmful. It means knowing your variants changes how you interpret everyday choices most people never question.

You're doing everything right and still feel off. This might be why. Folic acid can't work in your body as-is. It has to go through DHFR — an enzyme that converts it into a usable form. Green tea inhibits DHFR. Significantly. So if you're taking folic acid and drinking green tea, the conversion is blocked. Your cells aren't getting functional folate. Add in a MTHFR variant and DHFR is already running slow. Green tea makes it worse. This isn't a minor interaction. It's a full blockade on an already limited pathway. You can't feel better if the conversion never happens.

Most people think green tea is a healthy pregnancy swap for coffee. It's not. The compound that makes it interesting in cancer research — EGCg — also disrupts DNA synthesis. The same DNA your baby is building right now.

EGCg in green tea latches onto the same transporter your body uses to absorb folate. While it is there, your folate has nowhere to go and just gets excreted unused. Research confirmed up to 40% of folate never makes it into the bloodstream when green tea is involved. And it does not stop there. It can also block folate from reaching your baby's brain.

Most people know green tea as one of the healthiest drinks out there. But during pregnancy, the compound that makes it healthy is the same one that raises concern. EGCg works like a very mild chemotherapy drug, targeting rapidly growing cells. Outside of pregnancy that is a benefit. Inside of pregnancy, those rapidly growing cells are your baby.

It is not just about cutting sodium. It is about the balance between sodium and potassium, and most people have never even heard of it. A study of over 400,000 people found every single unit increase in the sodium to potassium ratio came with a 13% higher risk of death. The math is simple: divide sodium by potassium on the label. Above one, put it down.

Drinking a gallon of water a day does not mean your cells are hydrated. Water has to get inside your cells to do anything useful. Energy. Focus. Recovery. All of it happens there. Sodium helps. But it only moves water into your bloodstream and tissues — that's 30% of the equation. The other 70% is intracellular. And most people are running on empty there without knowing it.

Most electrolyte products are missing something fundamental. You can take all the potassium you want — but without enough magnesium, it won't stay where it needs to be. Magnesium activates ATP, and ATP powers the pump that actually moves minerals into your cells. Skip magnesium, and the whole system stalls. This is basic physiology that most products ignore. If you've ever wondered why you're still exhausted, still cramping, still thirsty no matter what you take — this video is going to change how you think about hydration completely.

Keto. Endurance training. Sauna. All three accelerate electrolyte loss faster than most people realize. The instinct is to reach for more sodium. But only about 6% of people are actually deficient in sodium. Meanwhile, 97% are deficient in potassium. Plain water won't fix this. Neither will a salty drink. Your body needs the right ratio — meaningful potassium, quality magnesium, and modest sodium. That's what moves fluid into your cells, not just around them. Most electrolytes on the market are built backwards. Check the label on yours.

Why Oncologists Miss the Most Important Thing youtube.com/shorts/O1nCOIr… via @YouTube

Most people assume folic acid and folate are the same thing, they are not, and that confusion has been quietly affecting your brain, immune system, and long-term health for nearly 30 years. Since 1998, the U.S. government has mandated a unnatural, biologically inactive compound into virtually everything you eat, and your body cannot reliably convert it into the form your cells actually need. In this video, I use over 15 years of research into folate metabolism to explain exactly how unmetabolized folic acid blocks folate receptors in the brain and kidneys, suppresses immune function, and poses serious risks during pregnancy and infancy.

Many people believe their genes determine their health and that if something runs in the family, it’s inevitable. In this video, I explain why that belief is outdated, and how modern epigenetics shows that genes respond to inputs like nutrition, stress, toxins, sleep, infections, and lifestyle.

Millions of people struggle with fatigue, anxiety, migraines, infertility, and “mysterious” health issues that doctors can’t explain. What most people don’t realize is that almost 1 in 2 people have the MTHFR genetic mutation—and it may be silently affecting how your body processes folate, detoxifies, and creates energy. In this video, I break down the MTHFR gene explained simply, including what it does, why it matters, the real problem with folic acid, how to know if your MTHFR gene is “dirty,” and the proven steps to clean it. If you’ve ever been told your labs look normal but you still don’t feel well… this might be the missing piece.

In 2008, I had a moment that completely flipped my understanding of health and chronic disease. I realized our genes aren’t “broken”… they’re dirty. They're influenced by our nutrition, toxins, stress, sleep, and environment. And when you clean them, the body can reset. This video is the story of how that realization changed my life, my career, and my health, and why it matters for you.

@Doffx yo Doff!

@DrBenLynch Dr Ben back on Twitter, you love to see it.

The 49ers continue to experience injuries. Current trending cause is the neighboring electrical substation. Valid concern. I also suggest looking into if fluoroquinolones (Cipro) are being prescribed by the team doctor. This antibiotic drastically weakens collagen. #49ers #cipro pmc.ncbi.nlm.nih.gov/articles/PMC46…

If you’re pregnant, or planning to be, you’ve probably seen confusing or alarming headlines about medication use during pregnancy. In this video, I break down what current research shows about Tylenol use during pregnancy, how the body processes it, and why context matters—without fear-based claims or oversimplified conclusions. This conversation isn’t about blame or banning medication. It’s about understanding biology, timing, dosage, and individual differences that influence pregnancy and early development. Over the past several decades, autism diagnoses have increased significantly. During the same period, acetaminophen became more commonly used during pregnancy. But population-level trends alone don’t explain individual outcomes. What matters is how acetaminophen is metabolized during pregnancy, how maternal detox pathways shift, and why genetics, nutrient status, inflammation, stress, and environmental exposures can influence vulnerability in very different ways from person to person.

Many children with attention, learning, language, or behavioral challenges may not be getting enough usable folate into their brain, even when their blood levels look normal. In this video, we break down a little-known biological bottleneck that can block folate transport across the blood-brain barrier, what triggers it, why high-dose prescriptions are sometimes used, and why results often plateau if the underlying blockages aren’t addressed first. You’ll learn how folate transport actually works, what can interfere with it, and practical steps parents can discuss with their practitioner, including nutrition, testing, and support pathways that are often overlooked in standard training. This is not about blame. It’s about understanding mechanism, and asking better questions. Always work with a qualified healthcare professional before making medical or nutritional changes.