Why Does GNC Vitamins Have a Cancer Warning?

January 29, 2023
3 min read

We all know Prevention is better than cure. Vitamins are widely used as a preventative tactic against various diseases and health problems. Therefore, GNC vitamins have gained popularity in recent years. A large number of customers, however, have a common question regarding the warning label on GNC vitamins that reads,

“This product contains a chemical known to the state of California to cause cancer”

Several concerns arise from this warning, including why it is included in GNC vitamin packaging and what we should do about it. For the purpose of this blog post, we will try to understand the significance of the cancer warning on GNC vitamins.

GNC Vitamins Contain a Synthetic Form of Vitamin A

This is one of the main reasons that GNC supplements are flagged with a cancer warning. The health concerns associated with taking excessive amounts of natural vitamin A are similar to those of taking synthetic vitamin A. Vitamin A helps maintain normal vision, skin, and immunological function, but taking in too much of it can cause birth abnormalities, liver damage, and even cancer.

Furthermore, the synthetic version of vitamin A can be more dangerous than natural sources, necessitating the inclusion of health warnings.

High Doses of Vitamin A Can Increase The Risk of Certain Cancers

National Institutes of Health researchers found that taking large amounts of vitamin A may raise the chance of developing malignancies of the liver and lungs. Therefore, a cancer warning appears on the packaging of GNC vitamins. Further, vitamin A toxicity can cause fainting, lethargy, headaches, blurred vision, and even death if taken in excessive amounts.

Because of this, it’s crucial not to exceed the maximum daily allowance for this vitamin. Therefore, an average adult should take maximum 10,000 IUs every day.

GNC Included Warning Labels to Inform Their Customers

Because of the possible side effects of vitamins, GNC has added warning labels on its products. Customers can also access a complete list of ingredients and potential adverse reactions from the manufacturer. This is done so that shoppers can feel confident in their purchases.

GNC took this action to demonstrate its dedication to honesty and the well-being of its clientele.

Consult With a Doctor Before Taking Any Vitamins

GNC vitamins, like any other vitamins, come with potential side effects. Therefore it’s best to talk to a doctor before taking them. Vitamins sold at GNC have been given the all-clear by the FDA. Still, they have been linked to an increased risk of some types of cancer, liver damage, and even serious allergic reactions. That’s why it’s smart to check with your doctor to see if GNC supplements fit your health needs.

GNC Offers Lower Doses of Synthetic Vitamin A as An Alternative Option

For customers concerned about the possible cancer risk linked with larger doses of synthetic vitamin A, GNC offers a selection of vitamins with lower levels as an alternative. If you want to limit or avoid your intake of synthetic vitamin A, they also have a selection of supplements that don’t use it.


According to Proposition 65, a cancer warning label is required on all GNC vitamin products sold in California. According to the law, a cancer warning label must be placed on any product that is expected to expose consumers to more than a specified amount of known carcinogens. It’s vital to be informed of the components used in any product you choose to use. As some compounds come with a possible risk but are nevertheless commonly utilized in nutritional supplements.

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