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Health

A Neurologist Shares 3 Supplements You 'Need To Be Careful About Taking' Because They Can Be 'Toxic' To Your Brain Health: Zinc, More

June 13, 2025 by Abigail Connolly
shefinds | Health
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Supplements can have so many benefits, as they’re known to fill in the gaps that our daily diet and nutrition can’t cover. However, when you take too much of one supplement, you can actually be putting your brain at risk.

Dr. Bing, MD MPH, a Mayo Clinic-trained neurologist and content creator, recently made a video about three common supplements that “you need to be careful about taking,” given that some of them are so popular these days. In his caption, he writes that having too much of these vitamins and minerals in your system can “be toxic to your brain and nervous system.” Our brains are very delicate organs, and we need to do what we can on a daily basis to take care of them. Read more about what Dr. Bing had to say below.

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White zinc vitamins in a jar on a wooden surface.

1. Zinc

Zinc supplements are very popular, as zinc is well known for helping you get over colds or prevent a cold. However, you need to be on the lookout for how much you take.

 

"Now zinc is essential for our bodies and can be found in multiple food sources," says Dr. Bing.

 

"But the problem is when people take supplements daily for months, they can easily go over the safe limit. Too much zinc would interfere with copper absorption, and copper is essential for your nervous system."

 

According to Dr. Bing, low copper levels can cause "myeloneuropathy, which is damage to the spinal cord and your peripheral nerves."

Dispensing a vitamin A pill from a bottle.

2. Vitamin A

Vitamin A is another trendy supplement, as it has a reputation for improving your skin health, immunity, and more. What's unique about vitamin A is that it's "fat soluble," which, according to Dr. Bing, "stores in your liver and it can accumulate over time."

 

"Too much of this can lead to a condition called Pseudotumor Cerebri, which is increased pressure in the brain that mimics a brain tumor causing headaches, blurred vision, and even permanent vision loss," he continues.

Vitamin D capsule on a colorful background.

3. Vitamin D

Also known as the 'sunshine vitamin,' vitamin D is often taken to improve bone health and boost immunity. Dr. Bing points out that vitamin D supplements are usually taken by infants or people over 50 who can use some assistance to keep their bones strong.

 

"However, taking too high doses of vitamin D can cause calcium to build up in your blood, which can affect the brain, leading to things like confusion, fatigue, depression, and sometimes, even psychosis," he continues.

 

At the end of his video, Dr. Bing reminds his audience that "while these vitamins and minerals are essential for our bodies to function, moderation is key."

 

"Like almost everything else in life," he adds. "More is not always better."

 

If you're worried about taking too much or too little of a supplement, be sure to speak with your doctor.

Author:

Editorial Assistant

Abigail is a journalist based in Brooklyn, New York. As an Editorial Assistant for SheFinds, she covers topics ranging from celebrity news and fashion to wellness. She has written for other publications, including Chip Chick, Bandsintown, BroadwayWorld, and more. When she isn't writing, Abigail loves spending time in the city with her friends, being a 'dog mom' to her Chihuahua, and singing along to some of her favorite music.

Healthy seeds displayed, contrasting with unhealthy pastries.
Grocery store aisle featuring sugar and artificial sweeteners.
Person enjoying a healthy lunch at a dining table.
Sipping spearmint tea for relaxation and digestion.
Frustrated older woman holding her head in distress.
Woman experiencing chest pain, highlighting health concerns.
Various types of bread displayed on a wooden surface.
Woman holding her head, feeling overwhelmed or stressed.
Woman experiencing joint pain, indicating health issues.
Popular fast food options from Dunkin', Chick-fil-A, and Starbucks.
Woman adding sugar to her aromatic cup of coffee.
Assorted bagels with blueberries and butter on a wooden board.
Pouring vitamin D drops into palm for daily health.
Comparing cooking spray and olive oil for healthy cooking.
Older woman taking supplements with water for wellness.
Top view of Brazilian food dish with rice, beans, and chicken.
Handful of dietary supplements for optimal nutrition.
Checking time on a watch during breakfast.
Close-up of supplement powder being poured into a glass.
Woman exercising outdoors for fitness.
Healthy seeds displayed, contrasting with unhealthy pastries.
Grocery store aisle featuring sugar and artificial sweeteners.
Person enjoying a healthy lunch at a dining table.
Sipping spearmint tea for relaxation and digestion.
Frustrated older woman holding her head in distress.
Woman experiencing chest pain, highlighting health concerns.
Various types of bread displayed on a wooden surface.
Woman holding her head, feeling overwhelmed or stressed.
Woman experiencing joint pain, indicating health issues.
Popular fast food options from Dunkin', Chick-fil-A, and Starbucks.
Woman adding sugar to her aromatic cup of coffee.
Assorted bagels with blueberries and butter on a wooden board.
Pouring vitamin D drops into palm for daily health.
Comparing cooking spray and olive oil for healthy cooking.
Older woman taking supplements with water for wellness.
Top view of Brazilian food dish with rice, beans, and chicken.
Handful of dietary supplements for optimal nutrition.
Checking time on a watch during breakfast.
Close-up of supplement powder being poured into a glass.
Woman exercising outdoors for fitness.