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My best friend started Mounjaro in January. By June, her hair was falling out in clumps and nobody could tell her why. I'm the one who finally figured it out. She's 38. She shouldn't be losing her hair like that. I thought maybe it was just stress from the rapid weight loss. Turns out, it was a warning sign I'd been missing for months along with the exhaustion, the brain fog, and the way she'd slowly stopped being herself. Something was being drained from her body. And neither of us knew it. My friend Sarah used to be the energetic one. The one who planned everything. Always texting first. Always suggesting brunch, hikes, random Target runs. Always on. Always moving. She started the medication because nothing else had worked for the weight. Years of dieting. Gym memberships she barely used. She was tired of fighting her body. And the medication was working. She lost 40 pounds in 5 months. She was finally fitting into clothes she'd given up on. She was happy. But somewhere around month 4, something shifted. She started canceling plans. Too tired. Always too tired. I'd text her to grab coffee and she'd say "I just can't today." Over and over. When we did hang out, she seemed foggy. Distant. Like she was there but not really there. She'd lose words mid-sentence. Forget things she'd just told me five minutes earlier. I'd ask how she was feeling and she'd say "fine, just exhausted from not eating much. You know how it is." But I didn't know how it was. This wasn't normal tired. This was different. She was freezing all the time. Wearing cardigans in July. Her hands were like ice when I hugged her. She joked about it but I could tell she was worried. And then the hair started. She'd text me photos of her brush. Clumps. Actual handfuls of hair. She was scared to wash it because of what she'd see swirling down the drain. Her ponytail — the thick one she'd always been proud of — shrunk to half its size. She started wearing hats everywhere. Headbands to cover her part line. She tried everything. Biotin — the 10,000mcg one everyone recommends. Collagen in her smoothies every morning. Even splurged on Nutrafol at $88 a bottle for three months. Nothing worked. Her doctor said it was telogen effluvium. Shock to the system from rapid weight loss. "It's temporary. Give it time. Eat more protein." But it wasn't stopping. And she was getting worse, not better. The exhaustion was deepening. The fog was thickening. And now she was losing her hair on top of it. She started talking about stopping the medication. "What's the point of being thin if I'm bald and can barely function?" I started researching because I couldn't watch my best friend fall apart. One night I found a thread about how GLP-1 medications deplete iron stores. Not just from eating less — but from actually impairing absorption in your gut. I almost scrolled past. I'd never heard of this connection. But I kept reading because these women were describing Sarah exactly. The hair falling out in clumps. The crushing fatigue that sleep didn't fix. The brain fog that made them feel stupid. The freezing hands. The ice cravings — Sarah had been chewing ice constantly for months. I'd noticed but never connected it to anything. That was Sarah. ALL of it. I went down a rabbit hole that night. That's when I saw it: "GLP-1 users have ferritin levels 20-30 points lower than matched non-users. Over 60% consume below the minimum iron requirement. And the medication impairs iron absorption by up to 30%." I froze. A triple drain. I found posts explaining that ferritin is your iron STORAGE — different from the "iron" doctors normally test. Labs say anything above 12 is "normal." But hair follicles need ferritin around 70 to grow properly. Women were walking around with ferritin of 15, 20, 25 — being told they were "fine" — while their hair follicles were literally starving. Below 30? You have 21 times the risk of hair loss. Twenty one times. And here's what made my stomach drop: The biotin doesn't work because biotin doesn't fix iron deficiency. The collagen doesn't work because collagen doesn't rebuild ferritin stores. The protein helps but isn't enough because you can't eat your way out of an absorption problem. These women were throwing money at supplements that couldn't possibly fix the actual problem. And so was Sarah. I called her first thing the next morning and told her to get her ferritin tested. Not iron. Not hemoglobin. Ferritin specifically. She said her doctor had already checked her iron. It was "normal." I told her that's not the same thing. Ferritin is your iron STORAGE — what your hair actually runs on. Most doctors don't test it unless you're severely anemic. She pushed her doctor. Got the test. Her ferritin was 16. "Normal" according to the lab range. But I'd read that hair needs 70. She'd been running on fumes for months and nobody caught it. The exhaustion wasn't from "not eating enough." It was because her cells weren't getting enough oxygen. The brain fog wasn't from the medication. It was because her brain was being starved. The ice chewing? It's called pagophagia — one of the strongest clinical signs of severe iron depletion. Her body was craving ice because chewing it increases blood flow to the brain. She wasn't going crazy. Her body was trying to survive. She tried pharmacy iron first. Ferrous sulfate. Three days later she stopped. Stomach cramps. Constipation. Nausea. She couldn't handle it on top of the GLP-1 side effects she was already managing. The cure was worse than the disease. I went back to researching. The women who actually got results used a different form — iron bisglycinate. Absorbs through a different pathway. No gut destruction. And they needed the cofactors too — Vitamin C, B12, B6, folate — to actually convert iron into stored ferritin. I found a supplement called FerraVital that had everything in one capsule. Sent her the link that night. She didn't think it would work. She'd tried so many things. She'd been burned so many times. But within 2 weeks, something shifted. She texted me first. Just a random meme like she used to. No reason. Just felt like it. When I called her, she actually sounded awake. Alert. Not that foggy, distant voice I'd gotten used to. She said she had energy. Real energy. Not the "I'm surviving" energy she'd been running on for months. By week 3, the brain fog lifted. She said she felt sharp again for the first time since starting the medication. She could think. She could remember things. She didn't feel stupid anymore. The ice cravings stopped completely. She walked past the freezer without even thinking about it. By week 6, less hair in the drain. She sent me a photo of her brush — still some hair, but not the clumps. Not the handfuls. Not the panic. By week 10, baby hairs. Fuzzy regrowth at her temples. Along her hairline. Through her part. Her hairdresser noticed before she did. "What are you doing differently?" She retested her ferritin. 54 and climbing. She called me crying. Good crying. She didn't have to stop the medication. She didn't have to choose between the weight loss and her hair. She just had to fix what was actually being depleted. The exhausted, foggy, freezing woman who couldn't think straight and was losing her hair? That wasn't Sarah. That was severe ferritin deficiency masquerading as "medication side effects." I got my best friend back. If your friend, your sister, or YOU are on Ozempic, Wegovy, Mounjaro, or Zepbound and experiencing: ✗ Hair falling out in clumps ✗ Exhaustion that won't quit ✗ Brain fog, can't think straight ✗ Freezing cold all the time ✗ Ice cravings ✗ Biotin and collagen didn't work It's probably not "just the medication." It's what the medication is depleting. Get ferritin tested. Not iron. Ferritin specifically. Don't let anyone tell you 16 or 20 is "fine." Your hair needs 70. ======== EDIT: the supplement is FerraVital: https://try.nivara-shop.com/listicle Only iron she could tolerate on top of the GLP-1. 90-day guarantee.