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Food

Avoid These 2 Common Supplements Because They Can Damage Your Stomach Lining: Iron & More

March 30, 2025 by Mariam Qayum
shefinds | Food
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The stomach lining, also known as the gastric mucosa, is a protective layer of cells that lines the inside of the stomach. It plays a crucial role in shielding the stomach from the harsh acidic environment necessary for digestion. However, certain supplements can damage this delicate lining. It’s important to be mindful of supplement intake to protect the stomach and maintain digestive health.

To shed some light on two potentially harmful options, we spoke to family nurse practitioner Monelle Burrus. She told us that iron supplements and fish oil could damage your stomach lining. Learn more about the risks of each below.

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Iron supplements for improved health and wellness

1. Iron Supplements

Iron is crucial to your health, and if you are anemic or simply aren't getting enough of this mineral in your diet, supplements often serve as a good option. However, iron supplements can be rough on the stomach. Burrus warns that they "may lead to ulceration" and "can also corrode with the acids in the stomach, which would lead to irritation." To support iron levels, she suggests consuming natural sources like "spinach, beans, and lean meats," ideally combined with foods high in vitamin C to improve absorption.

READ MORE: 8 Supplements With Hidden Dangers, From Liver Damage To Cardiovascular Risks, Experts Warn

Fish oil supplements for heart and brain health

2. Fish Oil

Fish oil can target a number of health needs thanks to the fact that it offers up healthy omega-3 fatty acids. Unfortunately, Burrus warns that it can upset the stomach. "High doses of Omega 3 fatty acids are healthy for the heart; however, they can cause stomach upset, heartburn, and can also cause bleeding problems mostly among those who are already taking blood thinner products," she explains. For a gentler option, she recommends choosing "enteric-coated capsules" or getting omega-3s from whole foods like walnuts and flaxseeds.

Author:

Editorial Assistant

Mariam is an Editorial Assistant and writer at SheFinds, covering everything from style and beauty to health and wellness. Splitting her time between New York and Philadelphia, she brings a sharp eye for trends and a passion for storytelling to the digital space. With a strong editorial background, she’s always exploring the latest in fashion, skincare, and wellness. When she’s not writing or pitching, you’ll find her in the kitchen experimenting with new recipes or planning her next travel adventure. You can reach Mariam at mariam@shefinds.com.

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Frozen pizza display in grocery store aisle
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Woman enjoying a cup of spearmint tea
Variety of bread types displayed on a table
Freshly baked goods from Costco bakery
Woman holding her head, expressing concern or stress
Woman experiencing joint pain while holding her knee
Close-up of a vibrant food dish with colorful ingredients
Popular fast food brands: Dunkin', Chick-fil-A, Starbucks
Woman adding sugar to a steaming cup of coffee
Wooden board with bagels, blueberries, and butter
Comparing cooking spray and olive oil for cooking
Top view of Brazilian dish with rice, beans, and chicken
Checking watch while enjoying a healthy breakfast
Display of deli meats and sandwich products in grocery store
Delicious cooked salmon with rice, avocado, and greens.
Inside a bustling Costco store showcasing products.
Woman taking magnesium supplement for health benefits.
S'mores brownies and baked ricotta from Aldi's selection.
Grilled chicken breast served with crispy fries and salad.
Frozen pizza display in grocery store aisle
Plate of fried fish with crispy fries