10 vitamins and minerals you should never take — and why

4. Synthetic B12 (Cyanocobalamin)

The most common B12 supplement is cyanocobalamin—yes, that “cyano” means it contains a little cyanide. While it’s not instantly deadly, it’s not as effective as natural methylcobalamin and can deplete your body’s glutathione, an essential antioxidant. If you smoke or have certain genetic issues with detox pathways, this combo can be extra risky.

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For naturally occurring B12, stick to red meat or liver. Only supplement with methylcobalamin if you need a boost.

5. Calcium Carbonate

Look at that heavy supplement bottle—yep, it’s weighed down with calcium carbonate. It’s basically ground-up rock (chalk!), poorly absorbed, and can build up in your arteries or kidneys, increasing your heart attack risk. Plus, taking excess calcium without enough magnesium (should be a 1:1 ratio!) can cause major magnesium deficiency.

You’re better off getting calcium from dairy, yogurt, cheese, certain leafy greens, and fermented products rather than supplements with this rock-hard filler.

6. Iron (Ferrous Sulfate)

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My 9-year-old daughter baked 300 Easter cookies for the homeless — the next morning, a stranger showed up at our door with a briefcase full of cash. My daughter, Ashley, has always had a heart too big for her chest. Since my wife died, we’ve barely been making ends meet. We spent everything we had trying to save her from cancer. But when Easter came this year, Ashley told me she’d been saving up her own money to buy ingredients. “For the homeless,” she said. Her mom used to be one of them. She was thrown out by her parents when they found out she was pregnant with Ashley. When I met her, she had nothing — but she had the brightest smile and the sharpest mind I had ever seen. I fell in love with her. I took her and Ashley in. And from that moment on, Ashley became my daughter in every way that matters. So when Ashley said she wanted to help people like her mom once was… I didn’t stop her. For three nights straight, after school and homework, she baked. Her little hands worked nonstop. She found her mom’s old cookie recipe. She rolled every piece of dough herself. She decorated every cookie. She made three hundred cookies. On Easter, she handed them out one by one. She looked people in the eyes. She wished them a Happy Easter. Some of them smiled. Some of them cried. I stood there thinking it was the proudest moment of my life. I thought that was the end of it. The next morning, I was washing a mountain of dishes when the doorbell rang. I opened the door. An older man stood there in a worn-out suit, holding a scratched aluminum briefcase. His eyes were locked on Ashley. Before I could ask anything, he set the case down and opened it. I froze. Stacks of hundred-dollar bills — more money than I had ever seen in my life. “I saw what your daughter did yesterday,” he said, his voice shaking. “I want to give all of this to her.” My heart skipped. Then he added: “But you have to agree to ONE CONDITION.” My chest tightened. “What condition?” I asked. He stepped closer. He lowered his voice. And what he asked for in return made my blood run cold.

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