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I've treated thyroid patients in Switzerland for 16 years. When I moved to America, I couldn't believe what endocrinologists here were telling their patients. I've been an endocrinologist for 18 years. The first 16, I practiced in Zurich. I moved to the United States two years ago. Joined a practice in Boston. Good doctors. Good practice. And in my first three months, I saw something that kept me up at night. Women in their 40s, 50s, 60s on levothyroxine. Some for five years. Some for twelve. Every one with the same story: "My doctor says my levels are normal." And every one looking the same — exhausted, puffy, foggy, gaining weight they couldn't explain, quietly disappearing from their own lives. In Switzerland, we don't send a patient home with a full T4 tank and no conversion support. Because by the time a woman has been on levothyroxine for years with persistent symptoms despite "normal" TSH — something has already failed. And it's not her. Here's what your endocrinologist probably hasn't explained. Your levothyroxine provides T4. Raw fuel. It fills the tank — which is why your labs read "normal." Your doctor checks the tank. Full. Box ticked. But T4 doesn't do anything on its own. Your body has to convert it into T3 — the active hormone — before a single cell gets the signal to burn, think, or function. T4 is the fuel. T3 is the switch that lights the furnace. Your prescription fills the tank. It was never designed to flip the switch. And your doctor was never trained to check whether the switch is on. That conversion runs on specific nutrients — selenium, zinc, iodine — in bioavailable forms. When those deplete, conversion drops. The fuel sits. The furnace stays dim. Your labs stay "normal." And you keep gaining weight, losing energy, and blaming yourself. Published endocrinology research has documented this for years. Patients with "normal" TSH can have Free T3 at the bottom of the range — meaning the tank is full but the signal barely reaches the cells. In Switzerland, this is where we start. With the conversion. In America, I've watched hundreds of women get sent home with a full tank and a dead switch and told to try harder. Here's what happens when the switch stays dim year after year. It doesn't stay dim. It gets dimmer. Year one: 8-10 pounds. "Probably needs time to adjust." Year three: 20-25 pounds. Diets stalling. Afternoon crashes. "Try eating less." Year five: 30-40 pounds. Exhaustion that sleep doesn't touch. Clothes in boxes. Photos avoided. Year seven+: the body is so entrenched in storage mode that even GLP-1 injections only work while you're paying — and devastate when you stop. Every year that switch stays dim, the hoarding hardens and the woman drifts further from the person she used to be. Meanwhile, every diet confirms the famine signal — her body hoards harder. Every injection muzzles the hunger but never touches the switch — the day she stops, the weight floods back. Every "thyroid support" capsule uses cheap oxide forms her gut can't absorb. She's fighting symptoms. Nobody's addressed the switch. Your endocrinologist isn't evil. Most are well-meaning physicians practicing what they were taught. But what they were taught is incomplete. American training focuses on TSH and T4 replacement. Checking conversion isn't part of most standard appointments. It's a seven-minute visit. One number. Prescription renewed. That's not a criticism. It's where the knowledge gap sits. But the result is a pipeline that serves everyone except the patient. A woman on levothyroxine who gains weight eventually ends up on GLP-1 injections at $1,000+ a month. Those injections work while she's paying. They stop when she stops. Nobody checks whether a few drops of conversion support would have made the injections unnecessary. Nobody profits from a $34 solution to a $12,000-a-year problem. The research exists. Your doctor just wasn't taught to look. One of my patients came to me after seven years of this exact trajectory. Levothyroxine since her early 40s. Gained 42 pounds. Tried everything — diets, supplements, injections. Spent thousands. Every doctor said "your levels are fine." I checked her conversion. Free T3 at the bottom of the range. The tank was full. The switch was barely on. I recommended sublingual conversion support — TryCure Thyroid Support Drops. Drops under the tongue, absorbed into the bloodstream, bypassing the gut. Selenomethionine, not selenite. Chelated zinc, not oxide. The conversion cofactors in forms that actually work. Within two weeks the fog lifted. By week four her rings fit. By week six her waistband loosened before the scale moved. She said: "I'm not losing weight. I'm coming back." If you're on levothyroxine and still feel exhausted, foggy, and stuck — this is the product I recommend to my own patients. The formula is exactly what I'd look for: the right cofactors, in bioavailable forms, delivered sublingually so they actually reach your bloodstream. Don't wait seven years like she did. 👉 https://www.trycure.shop/products/thyroid-support-drops-1 Your levels aren't the problem. The switch is. Dr. Rebecca Collins