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Doctor Warns Against These 3 Supplements That Can Weaken Your Bones Over Time: Excess Vitamin A, More

September 5, 2025 by Faith Geiger

 
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Supplements are often praised for their ability to fill nutritional gaps and support overall health. But while certain vitamins and minerals are essential for strong, healthy bones, taking some options in excess can actually do more harm than good. Experts warn that too much of a “good thing” can lead to serious issues, including bone pain, fractures, and even long-term damage to your skeletal system.

That’s why it’s so important to know which supplements to approach with caution. From minerals like zinc that can throw off your body’s delicate balance, to fat-soluble vitamins like A and D that can quickly build up to toxic levels, not all bone-supporting nutrients are safe in high doses. We spoke to Orthopedist Rishabh Nanavati, MBBS, MD to highlight a few potentially harmful options: zinc, vitamin A, and vitamin D. Find all of his expert insight below.

1. Zinc

Zinc is often valued for its role in boosting the immune system and supporting bone health. However, as with the other supplements on this list, "more" definitely isn’t always "better" when it comes to this mineral.

"Excessive zinc intake can interfere with copper absorption," Dr. Nanavati warns. "Since copper is essential for maintaining bone health, a deficiency caused by too much zinc may weaken bones over time." A balance between zinc and copper is crucial for optimal bone health, so it’s best to avoid extremely high doses of zinc, especially when it hasn't been prescribed by your doctor.

2. Vitamin A

Vitamin A is vital for many of your body's functions. It plays an important role in vision and immunity, for starters. However, when taken in excess, this supplement can lead to a condition known as hypervitaminosis A, which has been linked to weakened bones.

"Too much Vitamin A can cause hypervitaminosis A, which results in bone pain, joint stiffness, and a higher risk of fractures," Dr. Nanavati says. This makes vitamin A especially concerning for people with conditions like osteoporosis or arthritis.

3. Vitamin D

On one hand, Vitamin D is essential for your bone health, as it aids calcium absorption. However, when taken in excessively high doses, Vitamin D intake can backfire.

"High doses of Vitamin D can cause hypercalcemia, where calcium levels in the blood become too high, leading to kidney stones, nausea, and even bone pain," Nanavati explains. As with any supplement, it's important not to go overboard, as elevated calcium levels can wreak havoc on your bones.

Bottom line

Ultimately, it's always crucial to be mindful of the supplements you're taking and the potential risks at hand. The best way to go is to pay close attention to dosages and do your research on any harmful interactions with other medications. Of course, when in doubt, speak to a healthcare professional. Stay safe!

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