Complementary Medicine in Cancer Treatment: How to Use It Safely
Many people going throught cancer treatment turn to complementary and alternative medicine (CAM) – such as herbal remedies and nutritional supplements – to support their wellbeing during treatment. When used correctly, these therapies can ease side effects, improve sleep, digestion, and energy, and help patients feel more in control of their health.
However, when used without guidance, some natural products can interfere with chemotherapy, radiation, or immunotherapy, reducing their effectiveness or increasing side effects. This is why it’s so important to seek advice from a qualified practitioner who understands both natural and medical treatments, and to communicate openly with your oncology team.
At Elemental Health in St Ives, we regularly see clients who have started supplements they found online or were recommended by a friend. While well-meaning, these can sometimes interact with cancer medications in ways patients don’t expect. Ensuring safety and effectiveness through evidence-based guidance is our priority.
Why Patient Safety Matters
Complementary medicine is not without risk. Even natural products have powerful effects that can influence how the body processes medications. Some herbs or nutrients can enhance or block drug metabolism, alter immune responses, or thin the blood—all of which may affect cancer treatment outcomes.
Your practitioner’s role is to protect you by researching your specific treatment protocol and checking for potential drug–nutrient interactions. This ensures the complementary treatments you use are both safe and beneficial.
Common Interactions You Might Not Expect
Here are some examples of supplements and herbs that can interact with cancer treatments:
- St John’s Wort – often used for mood support but can reduce the effectiveness of chemotherapy and other medications by speeding up liver detoxification.
- Turmeric (Curcumin) – highly anti-inflammatory and used by many practitioenrs as an adjunct to cancer treatment, however, it interfers with many chemotherapy drugs like Cyclophosphamide (Cytoxan, Neosar) and Doxorubicin.
- Green tea extract – can alter how some chemotherapy drugs are metabolised and may affect liver function.
- Fish oil (Omega-3) – can support inflammation control but, in high doses, may increase bleeding risk, especially before surgery.
- Medicinal mushrooms (reishi, shiitake, AHCC) – can modulate immunity and must be carefully timed with immunotherapy.
These examples highlight why it’s essential to get professional guidance before starting any supplement.
How a Qualified Practitioner Ensures Safe and Effective CAM Use
An experienced naturopath or integrative health practitioner will:
- Review your diagnosis, treatment plan, and medications to identify potential interactions.
- Research evidence-based therapies using clinical data to select supplements that support rather than interfere with your medical care.
- Tailor timing and dosage—for example, pausing certain herbs during chemotherapy and reintroducing them during recovery or calculating when drugs and herbal medicine have cleared the body.
- Collaborate with your oncology team, ensuring everyone is aligned on your care plan.
This integrative approach allows complementary therapies to enhance wellbeing while maintaining the integrity of conventional treatment.
Communication Is Key
For your safety, always inform your oncologist and care team about any supplements, herbal remedies, or alternative treatments you’re using. By sharing information openly, you help your healthcare professionals work together to deliver the safest and most effective care.
Jean Jarrett specialises in evidence-based complementary medicine and collaborates with oncologists, GPs, and specialists to ensure every recommendation supports your treatment, recovery, and long-term health.
Oncology Training and Experience
Jean Jarrett has completed advanced training in naturopathic oncology support, providing her with a thorough understanding of how to safely integrate natural and conventional treatments. Her specialised education includes herb–drug and nutrient–drug interactions, evidence-based nutritional and herbal support during chemotherapy, radiation, and immunotherapy, and the use of complementary medicine to help manage side effects such as fatigue, nausea, and neuropathy.
Jean has supported many clients through their cancer treatment and recovery, working alongside oncology teams to provide natural therapies that enhance tolerance to treatment and improve quality of life. Following treatment, she focuses on rebuilding health, energy, and vitality, helping clients restore immune function, digestive health, and overall wellbeing. Her approach always prioritises patient safety, evidence-based care, and clear communication with medical specialists to ensure the best possible outcomes.
Your safety comes first, and the right integrative support can help you feel stronger, more balanced, and confident throughout your cancer journey.
