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If your A1C is high and your feet have started tingling, I'm writing this for you specifically. Because I was you two years ago and nobody told me what was coming. My name is Marcus. I'm 64. Diagnosed Type 2 four years ago with an A1C of 9.1. First thing my doctor said: "We need to get that number down. That's our only focus right now." So for two years, that's all I thought about. The number. I took my Metformin. I changed my diet. I came in every three months and watched that number slowly drop. 8.7. 8.1. 7.6. 7.1. 6.8. My doctor would shake my hand. "Excellent work, Marcus. Excellent work." But about eight months in, something started in my feet. Just a faint buzz at night. Like a phone vibrating under the mattress. I mentioned it at my next appointment. "That's expected at your glucose levels," he said. "It'll improve as your A1C comes down." So I trusted him. Kept focusing on the number. But the buzzing didn't stop when the numbers improved. It got worse. Buzzing became tingling. Tingling became burning. Burning started waking me up at 3 in the morning. I went back. I said the A1C is down but my feet are getting worse, not better. He sent me to a neurologist. Peripheral neuropathy. Moderate to severe in both feet. I sat there and said — how? My numbers have been dropping for two years. How do I have moderate to severe nerve damage? And the neurologist looked at me in a way I'll never forget. Not surprised. Not alarmed. Just tired. Like he'd had this conversation a hundred times and was exhausted by it. "Nerve damage from prolonged high glucose is cumulative," he said. "The damage from when your A1C was at 9, 8, 7 — that doesn't stop the moment your numbers improve. Those nerves were starving. Some of that damage is done." I drove home and sat in my driveway for I don't know how long. Two years. I did everything right for two years. Hit every target. And my nerves were still dying the whole time. I thought about my father. He was diabetic for 22 years. A1C was always between 8 and 10 — doctors were always chasing it down, never quite catching it. Year 4: feet started tingling. They told him it was part of the disease. Year 9: burning bad enough he stopped sleeping through the night. Year 14: couldn't feel his feet. Started on gabapentin. Year 18: fell down the stairs. Couldn't feel the last step. Shattered his knee. Year 22: wheelchair. Both legs partially amputated below the knee. His A1C at the very end? 6.9. Finally under control. No legs. I wasn't going to be my father. I refused. So I went home and started researching everything I could find. Not the stuff my doctor told me. The actual science. What high blood sugar does to nerves at the cellular level. And I found something that made me furious. Two things are happening when your A1C is elevated. First — high blood sugar damages the tiny capillaries that feed your nerves. The nerve gets cut off from its blood supply. It starts to starve. First it misfires — that's the tingling, the burning, the electric shocks. Then it goes quiet — that's the numbness. Then it's gone. That part I sort of knew. But the second thing — nobody told me this. Think of your nerve like a wire. The copper inside is the nerve fiber. The rubber coating around the outside is called myelin — the protective insulation that keeps electrical signals traveling fast and clean. High blood sugar is cutting off the wire's blood supply from the outside. But here's what I didn't know: Metformin depletes the fuel your nerve cells need to maintain that insulation from the inside. Both. At the same time. And nobody mentioned it to me once in two and a half years on Metformin. Here's what's actually happening at the cellular level — and this is the part my neurologist had never explained. The myelin coating around your nerves doesn't just sit there. Your nerve cells are constantly rebuilding and maintaining it. Every day. That repair process requires energy — enormous amounts of it. And that energy is produced inside the nerve cell in structures called mitochondria. Mitochondria need two specific raw materials to run the energy cycle that powers myelin repair. Not vitamins in the general sense. Two specific compounds your nerve cells use directly — the moment they arrive, without any conversion, without any waiting. You may know them as B12 and B9. But not the kind at the pharmacy. The active forms — methylcobalamin and methylfolate. When both are present, the mitochondria produce energy at full capacity. The repair process runs. The myelin gets rebuilt between attacks. When Metformin depletes methylcobalamin — and it does, it's in the prescribing information, it's been there for years — the mitochondria can't run the repair cycle. The myelin that should be getting rebuilt stays stripped. The nerve keeps misfiring. The burning gets louder. The tingling spreads. High blood sugar cutting off the blood supply from the outside. Metformin depleting the repair fuel from the inside. Both happening simultaneously. For years. While every appointment we talked about one number and called everything else expected. I called my neurologist when I found this. I asked him — did you know Metformin depletes B12? Did you know B12 is what the mitochondria inside your nerve cells need to maintain the myelin sheath? He said yes. B12 deficiency is a known side effect. I said — then why wasn't I tested? Why wasn't I told to supplement from day one? He said: "It's something we should monitor." Should. Not "we were monitoring." Should. I got my B12 tested the next week. 187 pg/mL. Normal starts at 300. I had been severely deficient. For who knows how long. And nobody had checked once in two and a half years. I went straight to the pharmacy and bought B12 supplements. Took them every day for six weeks. Got retested. Exact same number. Didn't move at all. Here's why. B12 requires a protein called intrinsic factor to be absorbed. Intrinsic factor is produced in your stomach lining. Its only job is to grab B12 and escort it through the gut wall into your bloodstream. Without it, B12 can't cross. It just passes through. Here's the problem. Intrinsic factor production declines with age. It declines faster with long-term medication use, with gut inflammation, with the metabolic changes that come with Type 2 diabetes. By the time most people reach their 60s, their intrinsic factor production is a fraction of what it was at 30. And Metformin makes it worse. The same drug depleting your B12 also impairs the absorption pathway your body uses to replace it. So I swallowed those B12 tablets every morning for six weeks. Some of it made it through — enough to show up on the bloodwork panel as a number. But the amount actually reaching the mitochondria in the nerve cells at the ends of my toes? Same number. The pill never got there. This is why doctors treated B12 deficiency with injections for over a hundred years. Not because they preferred needles. Because they discovered that the oral route — relying on intrinsic factor — failed too many patients. The only fix was to bypass the gut entirely. Sublingual delivery does the same thing without the needle. Lift your tongue and look in a mirror. You'll see two blue veins running along the underside. Those blood vessels sit almost at the surface, separated from the outside by a membrane thinner than a piece of paper. When methylcobalamin and methylfolate dissolve there, they cross that membrane and enter the bloodstream directly. No stomach. No intrinsic factor required. The active forms — straight into the blood, straight to the mitochondria in the nerve cells that have been waiting for them. That's not a supplement company's claim. It's why nitroglycerin has worked under the tongue for heart patients for over a hundred years. Before I tell you what happened, I want to tell you the one thing that kept me going when the first two weeks felt like nothing. Peripheral nerves regenerate at approximately one millimeter per day. That's the measured biological rate of nerve repair under the right conditions. One millimeter. Per day. My nerve damage extended several centimeters in both feet. At that rate, full repair takes months — not days, not weeks. The first signal isn't that the burning stops. It's that something shifts. The burning changes character before it reduces. That shift is the repair beginning. I almost stopped at week two because I was watching for something bigger. Week 2: slept through the night twice. First time in over a year. The 3am burning just didn't wake me up. Week 4: the constant background buzz during the day got quieter. Still there. But like someone turned the volume down a little. Week 6: I walked into my bathroom and felt the new rug my wife had put down. Felt the fibers under my feet. I stood there for a full minute just feeling it. I almost cried right there in the bathroom. Week 10: walked around the full block for the first time in months. Came home and sat on the porch and thought about my father. Week 12: nerve conduction test. Previous results: 31 meters per second. Severely abnormal. Normal is 45–50. New results: 39 meters per second. The technician looked at the screen twice. "This shows improvement. Diabetic neuropathy doesn't usually change like this." My neurologist wrote in my chart: "Patient reports significant reduction in neuropathic symptoms. Nerve conduction velocity shows measurable improvement." That was 11 months ago. My A1C today is 6.6. Still working on it. Not perfect. But I sleep through the night. I walk without pain. I can feel the floor under me. The burning is maybe 20% of what it was at its worst. And I finally understand what was happening to me. The blood sugar was damaging my nerve's blood supply. The Metformin was depleting the methylcobalamin and methylfolate my nerve cell mitochondria needed to run the repair process. Both happening at the same time. For years. While every appointment we talked about one number and called everything else expected. It wasn't expected. It was preventable. If you're reading this and your A1C has been elevated — if you've been on Metformin for a year or more — please get your B12 tested today. I would bet money it's low and nobody has checked it. And if your feet have already started — any tingling, any buzzing, any burning, any numbness — the window to address this is open right now. But it doesn't stay open. My neurologist told me something I keep coming back to: "Nerves can regenerate. But only while enough fiber is still alive to rebuild from. Once the nerve is completely dead, nothing brings it back." I caught mine in time. My father didn't. Don't wait for the next appointment. Don't wait until the burning is waking you up every night. Don't wait until you're where my father ended up. The product is Nuvel. Sublingual methylcobalamin and methylfolate — both active forms, dissolves under the tongue, no stomach involved. Take it every morning alongside your Metformin. Let the Metformin do its job on blood sugar. Let Nuvel replace what the Metformin has been taking from your nerves. Both problems. Addressed together. Edit: people keep asking — https://trynuvel.com/products/b-essence-complex 90-day money-back guarantee. If your symptoms aren't better, you get every dollar back. Give it 12 weeks minimum. One millimeter per day. That's the rate. Expect the shift before the relief — the burning changes character before it reduces. That shift in week two or three tells you the repair has started. I went from 3am burning and nerve conduction of 31 m/s to sleeping through the night and 39 m/s in 12 weeks. My father lost his legs because nobody told him any of this. You know now.