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If your A1C is high and your feet have started tingling, I'm writing this for you specifically. It's long but please read it anyway. It took me six years to learn what's in here, and it will take you four minutes. My name is Marcus King. I'm 65. Type 2 diabetic, diagnosed six years ago with an A1C of 9.4. My doctor didn't sugarcoat it. He said this number decides how the rest of your life goes. Get it down. So I got it down. Metformin, 1,000mg, twice a day. Never missed a dose. Cut out the soda and most of the bread. Walked after dinner. Showed up to every appointment with my little logbook. And it worked. 8.8. Then 8.1. Then 7.4. Then 6.9. My doctor called me his best patient. Shook my hand at every visit and told me to keep doing exactly what I was doing. Somewhere in the second year, my toes started tingling. It wasn't excruciating pain yet. Just a light buzz at night, like my feet had fallen asleep and were trying to wake back up. I mentioned it at my next visit. He said tingling is common with a sugar history like mine, and it should settle down as the A1C keeps improving. He said “Diabetes-related neuropathy occurs when prolonged, uncontrolled high blood sugar damages delicate nerve fibers.” That made sense to me. Sugar caused it, sugar was dropping, so it should heal. Except that's not what happened. The next year my A1C was 6.8 and the tingling had spread across both feet. The year after, 6.6, and the tingling had turned into burning. I'd wake up at 2am with my feet out from under the covers, waiting for them to calm down. A numb patch showed up on the bottom of my right foot. It felt like a sock had rolled up under it, except there was no sock. It felt like my number kept going one way and my feet kept going the other. By last year I was holding the handrail on stairs like an old man. I'd look down and check the floor with my eyes before I trusted it, because I couldn't trust my feet to tell me what was under them. Here's the part I'm not proud of. I stopped bringing it up. The appointment was about the number, and the number was good. There didn't seem to be anything left to say. I gave up the evening walks. Bought hard-soled slippers so I couldn't feel the floor so much. Told my wife I was fine, and got good at getting up at 2am without waking her. I wasn't even angry. Eventually I had quietly decided this was the deal. Then my regular podiatrist retired, and last January a new one did my yearly foot check. She poked at my feet with that little plastic filament, marking a chart. Halfway through she stopped and asked how long I'd been on metformin. Six years, I said. She asked if anyone had ever checked my B12 in those six years, or told me to take it. No. Nobody. She put her pen down. What she told me over the next ten minutes explained everything, and I mean everything, about why my feet got worse while my numbers got better. Most of the damage in my feet was done back when my sugar ran high. Those early years, before the metformin, high blood sugar was beating on the nerves the whole time. Here's the part nobody tells you. Nerves can repair themselves. Slowly, but they can. The repair takes raw material, and the number one raw material is B12. And metformin drains your B12. It blocks your gut from taking B12 in from your food. It's printed right on the prescribing sheet. It's been known for decades. The longer you're on it, the lower your B12 sinks. So look at what my six years actually were. The sugar problem got smaller every year. And every one of those years, my B12 supply got smaller too. The old damage in my feet never got fixed. It just sat there and spread. That's why the burning got worse while the number got better. She was careful to say one more thing, and I'll repeat it because it matters. The metformin is doing its job. Do not stop taking it. But, it is also, quietly, taking the one thing your nerves need to heal, and nobody is watching that part. I drove home angrier than I'd been in years. Not at her. At six years of fifteen-minute appointments about one number, with not one person saying the word B12. That night I dug the folded paper insert out of my metformin box. The one nobody reads. It read “Long-term use may lower vitamin B12 levels.” Six years of refills. That sentence was in every single box. I don't think my doctor was hiding it from me. He gets fifteen minutes, and the fifteen minutes belong to the A1C. Nobody's job was watching what the pill was draining while it worked. So nobody watched. My podiatrist told me I need to look for 3 things when looking for a B12 supplement. One. It has to go under the tongue and soak straight into the blood through the mouth, so it doesn’t get broken down by your digestive system. Two. It has to be methylcobalamin, the form of B12 your nerves can use as is. The cheap form is synthetic and doesn’t absorb as well as the natural form. Three. It has to be a real clinical dose. Since you are supplementing your body with B12 that has been draining for years. I read a lot of labels that week. Most nerve supplements failed at least one of those. Plenty failed three. I found Nuvel in a diabetes forum, in a thread full of people on metformin describing my exact story. Good numbers, worse feet, nobody warned them. Checked the label. Sublingual liquid, methylcobalamin, a real dose. All three. I ordered it and started taking it every morning, right next to my metformin. Week 1, nothing much. This is usually where I'd quit, so I'm telling you now so you don't. Week 3, I slept straight through the night. I didn't trust it. Two nights later it happened again. Week 5, the daytime buzzing got quiet enough that I forgot about my feet for a whole afternoon. I actually noticed the forgetting. If you have this, you know exactly what I mean. Week 8, I stepped onto the kitchen tile one morning and felt cold under my right foot. That's the patch that had felt like a rolled-up sock for two years. Week 11, I started the evening walks again. Short ones at first. Week 16, back at the podiatrist. Same filament test. I felt it in two spots that were dead in January. She told me to keep going. I want to be straight with you about where I am now, because this is not a miracle story. The tingling isn't 100% gone. It's maybe a quarter of what it was. The 2am burning is rare now instead of every night. Some days are still better than others. My A1C is 6.5. I still take my metformin every single morning, and right after, Nuvel. One handles my sugar. The other puts back what the first one takes out. Nobody had to choose. If your A1C is high, or it used to be, and your feet have started, please hear this part. You did everything right. Taking your metformin was right. It just came with a side effect nobody told you about. I’ve linked the one I use right here: https://trynuvel.com/pages/news-page P.S. They back it with a 90-day money-back guarantee. If your feet aren't better after 12 weeks, you get every dollar back. They had a discount running when I bought mine, so I stocked up on three bottles. It's a small company and the diabetes forums keep cleaning them out, so if it's in stock, don't sit on it. And if someone you love takes metformin and has started rubbing their feet at night, send them this. Nobody told me for six years. You can tell them today.