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Are Supplements Safe After Cancer? What You Need To Know

author

Jo Cunningham

published

09/07/2025
Are Supplements Safe After Cancer? What You Need To Know

Many people recovering from cancer consider taking supplements to boost their health or ease treatment side effects. But not all supplements are safe. This article explores potential risks, as well as safe practices for supplement use and why professional guidance is essential for those living with and beyond cancer.

Understanding the potential risks of supplements is important after a diagnosis of cancer, particularly for those who are still on treatment.

Dietary supplements include a wide range of products, from vitamins, minerals, and herbs to amino acids and enzymes. While many people turn to these products with the hope of enhancing their health or reducing side effects of cancer treatment, it’s important to recognize potential risks of taking them.

This article explores those risks, as well as safe practices for supplement use and why professional guidance is essential for those living with and beyond breast cancer.

Potential risks of supplements

1. Interactions with medications

One of the most significant concerns after cancer is how supplements may interact with prescribed medicines. There’s conflicting evidence about the safety or effectiveness of some herbal products and vitamins, and some may affect how certain cancer treatments work.

2. Unregulated products

Unlike pharmaceuticals, dietary supplements are not always regulated. This can lead to variability in product quality, dosage, and purity. Unlisted ingredients may pose additional risks, particularly for individuals who have had or are having cancer treatment.

3. Side effects

Even commonly used vitamins, such as vitamin C, D, or E, can cause side effects. Some supplements can lead to digestive tract issues, allergic reactions, or interactions that may cause an increased risk of bleeding.

The importance of professional guidance

Before starting any supplement, it’s essential to talk with your healthcare providers. Registered dietitians and pharmacists can provide valuable insights into which supplements are safe to use based on your individual case.

Individualised recommendations

Healthcare providers can assess your specific needs, considering factors like dietary intake, current medications, and overall health. They can help identify where you might be lacking in specific nutrients and recommend food sources or, if necessary, safe supplements.

Safe practices for supplement use

If you’re considering supplements, follow these guidelines to minimize risks:

  • Research thoroughly: Look for reputable brands and check for third-party testing for quality assurance.
  • Start small: Introduce one supplement at a time, allowing you to monitor for any side effects.
  • Keep a medication list: Maintain an updated list of all medications and supplements you’re taking and share this with your healthcare providers.

While dietary supplements can play a role in supporting health, they are not without risks. Always consult with your healthcare team before starting any new supplement. By taking a cautious and informed approach, you can make decisions that support your health without compromising your recovery.

By Jo Cunningham

Cancer and Gut Specialist Dietitian

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