Sabrina Roger, MD Neuromuscular Specialist Facebook ad: “I'm A Neurologist. I've Seen Normal B12 Results Destroy A…”

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I have been a practicing neurologist for twenty-one years. I have sat across from patients who were told they were fine. Patients who were told it was stress, or aging, or anxiety, or perimenopause. Patients who spent years being passed between specialists, collecting normal test results, while something was quietly and measurably destroying their neurological function. I want to talk about one of them. Her name is not important. What is important is that she was 53, she was a high school principal, and when she first sat in my office she had already seen four doctors in eighteen months. Her primary care physician. Two internists. A psychiatrist who had put her on an antidepressant that did nothing except make her gain eleven pounds. She brought a folder to our first appointment. Color coded. Tabbed. Every test result, every doctor's note, every prescription she had been given, organized in chronological order. I remember thinking — this is not a woman whose problems are psychological. Depressed people do not make color coded folders. Anxious people do not cross-reference their own lab work. This is a woman who is fighting for her life with the only weapon she has left. Documentation. She described her symptoms the way precise people describe things. Specifically. The word retrieval failures had started approximately fourteen months earlier. Not general forgetfulness — she was clear about the distinction. Her long term memory was intact. Her episodic memory was intact. What was failing was access. She would reach for a word she had used thousands of times and find the path to it blocked. She described it as trying to open a door that should be unlocked and finding resistance she couldn't explain. Her processing speed had slowed. She could feel it. Problems that she used to solve in seconds now required conscious effort that felt effortful in a way that thinking had never felt before. She had developed compensatory behaviors without realizing it. She had started pausing before answering questions — not to think about the answer, but to check whether her words were going to arrive correctly before she opened her mouth. She had stopped telling long stories because she was no longer certain she could finish them. She was, she told me, terrified. Not of a diagnosis. Of the alternative. Of being told again that nothing was wrong. Of going home with another normal result and continuing to lose herself with no explanation and no path forward. I ordered the standard neurological workup. MRI. Cognitive assessment. Full metabolic panel. Then I ordered something most of her previous doctors had not thought to order. A methylmalonic acid test. A homocysteine level. An active B12 measurement — not total serum B12, which is what the standard panel measures, but holotranscobalamin. The fraction of B12 that is actually bioavailable to her tissues. I want to explain why this matters because I think most people — and frankly most general practitioners — do not understand what a standard B12 test actually measures and what it does not. When your doctor orders a serum B12 level, they are measuring the total amount of B12 circulating in your blood. This sounds like the right thing to measure. It is not. Approximately eighty percent of the B12 in your bloodstream is bound to a protein called haptocorrin. This bound B12 is biologically inert. It cannot enter your cells. It cannot cross into your brain tissue. It exists in your blood but it is completely unavailable to the systems that need it. Only the remaining twenty percent — bound to a different protein called transcobalamin, referred to as holotranscobalamin or active B12 — is actually available for cellular uptake. A standard serum B12 test measures both fractions together. A patient can have a total serum B12 that falls comfortably within the normal reference range while their active B12 — the only fraction that actually matters neurologically — is critically depleted. This is not a fringe observation. This is established in the peer reviewed literature. It is why neurologists who specialize in B12 related pathology do not rely on total serum B12 as a diagnostic marker. We use methylmalonic acid, which rises when cells are not receiving adequate B12 regardless of what the blood level shows. We use homocysteine, which accumulates when the methylation cycle is impaired by B12 insufficiency. We use holotranscobalamin directly. Her total serum B12 was 310 picograms per milliliter. Within the standard reference range. Four previous doctors had looked at that number and called it normal. Her methylmalonic acid was elevated. Her homocysteine was elevated. Her holotranscobalamin was critically low. Her cells were starving for B12. Had been for what the numbers suggested was at least two to three years. While four doctors looked at one number and told her she was fine. Now I want to explain what B12 insufficiency does to the brain, because I think the mechanism is something every person over the age of forty-five deserves to understand. Your neurons — every nerve cell in your brain and your entire nervous system — are wrapped in a substance called myelin. Myelin is a fatty insulating sheath, similar in function to the plastic coating around an electrical wire. Its purpose is to protect the nerve fiber and to dramatically accelerate the speed at which electrical signals travel along it. A healthy myelinated neuron conducts signals at speeds of up to seventy meters per second. A demyelinated neuron — one that has lost its myelin coating — conducts at a fraction of that speed, if it conducts reliably at all. This is not a metaphor. This is electrochemistry. When you reach for a word and it arrives instantly, that is a myelinated signal completing its path at full speed. When you reach for a word and there is a pause, a search, a sense of the thought being just out of reach — that is a signal traveling a damaged pathway. The word exists. The memory exists. The connection is slow or incomplete. B12 is not optional for myelin. It is structurally required. The myelin synthesis pathway cannot proceed without adequate cobalamin. This is biochemistry that has been understood for decades. What is less well understood — even among general practitioners — is the relationship between B12 absorption and age. Your gut absorbs B12 through a highly specific mechanism. Dietary B12 — whether from food or from a standard oral supplement — must first be separated from the proteins it is bound to. This requires adequate stomach acid. It then must bind to a glycoprotein called intrinsic factor, which is produced by specialized cells in the stomach lining called parietal cells. The intrinsic factor complex travels to the terminal ileum — the final section of the small intestine — where it binds to specific receptors and the B12 is transported across the gut wall into the bloodstream. This entire cascade depends on the health of your gastric parietal cells. Starting in the mid-forties, parietal cell function begins to decline in a significant percentage of the population. Stomach acid production decreases. Intrinsic factor production decreases. The absorptive capacity of the terminal ileum decreases. This process accelerates with age and is compounded by common medications — proton pump inhibitors, which are among the most widely prescribed drugs in the world, directly suppress the stomach acid required for the first step of B12 extraction. The result is a patient who eats meat, who takes a B12 supplement every morning, whose total serum B12 sits at 310 picograms per milliliter, and whose brain is nevertheless operating in a state of progressive B12 insufficiency because the delivery system that was quietly handling absorption for thirty years has begun to fail. Her neurons were demyelinating. Not dramatically. Not in a way that shows on a standard MRI at early stages. Slowly. In the white matter pathways responsible for processing speed, for verbal fluency, for the rapid retrieval of stored information. The principal who made color coded folders was losing the infrastructure her brain needed to access what she knew. I changed her supplementation protocol immediately. Not higher dose oral B12. The absorption problem makes higher oral doses largely irrelevant for a patient at her stage. You cannot fix a delivery failure by increasing what you put into a broken delivery system. Sublingual B12. Dissolved under the tongue, absorbed directly through the sublingual mucosa into the bloodstream. This route completely bypasses the gastric absorption cascade. No stomach acid required. No intrinsic factor required. No parietal cells required. The B12 enters circulation at full bioavailability regardless of the state of the patient's gut. Specifically methylcobalamin — the neurologically active form. Not cyanocobalamin, which is the synthetic form found in most inexpensive supplements and which requires additional conversion steps before it can be utilized by neural tissue. Methylcobalamin is the form the brain uses directly. Combined with the essential cofactors. B6 in its active form, pyridoxal-5-phosphate, which is required for neurotransmitter synthesis. Folate in its active methylated form, which works in direct partnership with B12 in the methylation cycle. B1, thiamine, which is required for the energy metabolism of the neurons themselves — the fuel that powers the cells that B12 is helping to repair. I have learned over two decades that B12 supplementation without these cofactors produces incomplete results. The repair process requires the complete system, not one component of it. She called my office at the four week mark. My nurse took the message. "Tell Dr. Roger that the door is opening again." At her six week follow up her processing speed on standardized assessment had improved measurably. Her verbal fluency scores had improved. She told me she had given a forty minute presentation to her school board the week before and had not once lost her thread. She also told me something that I think about often. She said: "Four doctors told me I was normal. You're the first one who tested for what was actually wrong." I want to be honest about something. What I tested for is not exotic. The methylmalonic acid test. The homocysteine level. The holotranscobalamin assay. These are available at any reference laboratory. They are not expensive. They are not experimental. The research supporting their use over total serum B12 for neurological assessment has existed in the literature for over twenty years. They are simply not part of the standard workup that a busy primary care physician runs in a twelve minute appointment. Which means there are patients — many patients — walking around with color coded folders full of normal results while their myelin quietly deteriorates and nobody has ordered the test that would tell the real story. If you are one of them — if you have been told your bloodwork is normal and you know something is wrong — what I would tell you is this: Normal is not the same as optimal. The reference ranges your doctor is using were not designed to identify early neurological insufficiency. They were designed to identify severe deficiency states. You can be well above the threshold for severe deficiency and still be losing the infrastructure your brain needs to function at the level it is capable of. The delivery system matters as much as the dose. A sublingual methylcobalamin complex that bypasses the failing absorption pathway entirely is not an alternative to medical care. It is, in many cases, the most targeted and effective intervention available — because it addresses the actual mechanism of the problem rather than trying to push more of something through a system that can no longer receive it. What I recommend to my patients in this situation, and what I recommended to her, is Nuvel. A sublingual B complex built specifically around this mechanism. Methylcobalamin that dissolves under the tongue and enters the bloodstream directly. The full cofactor system — B6, folate, B1 — that the repair process requires. No gut. No intrinsic factor. No delivery failure. It is not a pharmaceutical intervention. It is nutritional support targeted precisely at the breakdown point. It is also, in my clinical observation, one of the most consistently effective things I have recommended in twenty-one years of practice for patients presenting with this specific pattern of cognitive decline. 👉 https://trynuvel.com/products/b-essence-complex P.S. — She came back at three months with her reassessment results. Her methylmalonic acid had normalized. Her homocysteine had come down. Her cognitive scores continued to improve. She brought me a color coded folder of her progress, tabbed and dated. I kept it. It is the clearest illustration I have of what happens when you stop measuring the wrong thing and start fixing the right one. If your doctor has told you that you are normal and you know that you are not — push for the right tests, or start with the right intervention. The standard panel missed her for eighteen months. Do not let it miss you. P.P.S. — Myelin does not repair overnight. The damage accumulated over months or years and the restoration follows the same timeline. But the process cannot begin at all until the brain is receiving what it needs to begin it. Every day without adequate active B12 reaching your neural tissue is a day the repair does not start. You have already lost enough time to a system that was measuring the wrong number. Stop waiting. 👉 https://trynuvel.com/products/b-essence-complex — Dr. Sabrina Roger, Neurology

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I'm A Neurologist. I've Seen "Normal" B12 Results Destroy A Brain For 3 Years Straight.

The test your doctor orders is measuring the wrong thing. Here's what I order instead.