Clinical Specialism
Herbal Support Alongside Cancer Treatment
Let me be unambiguous from the outset: herbal medicine does not treat cancer, and I do not offer any treatment for cancer. What I offer is supportive care alongside your oncology team — help with the burden of treatment, and a rigorous check that nothing you are taking interferes with it.
Written by Garreth Falls MNIMH, Consultant Medical Herbalist · 8 min read
What this service is — and what it is not
This is a supportive care service. Your oncologist, haematologist, surgeon, and specialist nurses lead your cancer treatment, and nothing I do replaces, delays, or competes with any part of it. Under the Cancer Act 1939 it would in any case be unlawful for me to advertise any offer to treat cancer, and it would be clinically indefensible besides.
What I do is narrower and, I would argue, genuinely useful: help you tolerate treatment better, address the symptoms that erode quality of life during and after it, screen everything you are taking for interactions with your cancer therapy, and give you a straight answer about the supplements you have been sent by well-meaning family.
If you are looking for someone to tell you that a herb will shrink a tumour or that you can decline chemotherapy in favour of botanical medicine, I am the wrong practitioner. I will say so at the first appointment, and I will encourage you back towards your oncology team.
Where herbal and nutritional support can genuinely help
Conventional cancer treatment is effective and demanding. The demands are where supportive care earns its place, and they are often the things patients tell me nobody had time to discuss:
- Cancer-related fatigue — The most commonly reported and least addressed symptom, both during treatment and long after it finishes. Approached through sleep, nutrition, mitochondrial and adrenal support, and pacing rather than stimulation.
- Digestive disturbance — Nausea, appetite loss, taste change, constipation from anti-emetics and opioids, or treatment-related diarrhoea. Frequently the difference between maintaining weight and not.
- Sleep and anxiety — Scan-related anxiety, night waking, steroid-driven insomnia, and the hyper-vigilance that persists into remission.
- Mucosal and skin integrity — Mouth soreness, dryness, and radiotherapy skin reactions — supported topically and nutritionally, always in agreement with your radiotherapy team.
- Peripheral neuropathy — Tingling, numbness, and burning in hands and feet following certain chemotherapy agents. Support is realistic rather than curative, and always reported back to your oncology team.
- Immune and nutritional resilience — Protein and micronutrient adequacy, gut function, and recovery capacity between cycles — the unglamorous work that makes the most difference.
- Hormonal therapy side effects — Hot flushes, joint stiffness, mood change, and sleep disruption on aromatase inhibitors or androgen deprivation therapy — with strict attention to anything oestrogenic being avoided.
- Survivorship and after-treatment recovery — The period after discharge, when support often stops abruptly and fatigue, fear of recurrence, and deconditioning remain.
Herb–drug interaction screening: the most valuable hour you can spend
Most patients arrive with a bag. Turmeric someone recommended, high-dose antioxidants bought online, green tea extract, mushroom powders, a multivitamin, CBD oil, and often something a relative brought back from abroad with no English label. Nobody has reviewed any of it against their chemotherapy protocol.
Some of these are harmless. Some are not. St John's wort induces cytochrome P450 enzymes and can significantly reduce plasma levels of several chemotherapy agents and targeted therapies — potentially undermining treatment. High-dose antioxidants are contentious during radiotherapy and certain chemotherapies because of their theoretical interference with treatment mechanisms. Grapefruit affects drug metabolism. Anything with oestrogenic activity is inappropriate in hormone-receptor-positive disease. Herbs affecting platelet function or bleeding time matter around surgery and in thrombocytopenia.
So a substantial part of my work in this area is subtractive: telling people what to stop, what to pause until treatment finishes, and what is fine to continue. That work costs nothing in risk and can protect the effectiveness of the treatment you are relying on.
Where I do prescribe during active treatment, prescriptions are deliberately conservative, single-purpose, and disclosed. I will provide a written summary for your oncology team and I ask that you share it. If your oncologist objects to any part of it, their view takes precedence.
Herbs traditionally used in supportive care
The plants below have traditional and, in some cases, clinical use in the supportive contexts described above — symptom support and recovery, not cancer treatment. Their suitability depends entirely on your diagnosis, your treatment protocol, your blood counts, and your other medication. None of them should be self-prescribed during cancer treatment.
Timing matters as much as selection: several are appropriate after treatment completes but not during it.
- Ginger (Zingiber officinale) — One of the better-evidenced botanicals for treatment-related nausea, used alongside — not instead of — prescribed anti-emetics.
- Chamomile (Matricaria recutita) — Traditionally used for digestive upset, anxiety, and disturbed sleep, and topically for mucosal and skin irritation.
- Marshmallow root (Althaea officinalis) — A demulcent traditionally used for sore, dry mucous membranes of the mouth, throat, and gut.
- Calendula (Calendula officinalis) — Traditionally used topically for skin and mucosal integrity — always with your radiotherapy team's agreement regarding what may be applied to a treatment field.
- Withania (Withania somnifera) — An adaptogen traditionally used for fatigue, stress, and poor sleep; typically reserved for the recovery phase and reviewed against immunotherapy and hormonal therapy.
- Milk thistle (Silybum marianum) — Traditionally used to support liver function, of interest where hepatic load is high — introduced only after checking against your specific protocol.
- Oats (Avena sativa) — A gentle nervine trophorestorative traditionally used for nervous exhaustion and convalescence.
- Lemon balm (Melissa officinalis) — Traditionally used for anxiety, restlessness, and sleep onset difficulty, with a favourable safety profile.
- Nettle leaf (Urtica dioica) — A nutritive herb traditionally used in convalescence, valued for mineral content rather than pharmacological activity.
How consultations work, and when I will decline
An initial appointment is 60–75 minutes. I will ask for your diagnosis, staging where known, your treatment protocol and where you are in it, recent blood results, all prescribed medication, and everything else you are taking. I will ask what your oncology team have said, and what matters most to you right now — because that is what we prioritise.
You leave with a written plan, a clear list of what to stop or pause, and a summary you can hand to your oncology team or specialist nurse. Follow-ups are usually shorter and more frequent than in other areas of my practice, because treatment cycles change the picture quickly.
I will decline to prescribe, or defer, in several situations: where you have not yet discussed a diagnosis with your oncology team; where a herb could plausibly interfere with active treatment; where blood counts make any additional variable unwise; where you are close to surgery; and where a patient's stated aim is to avoid or delay conventional treatment. Declining in those circumstances is part of the job, not a failure of it.
Appointments are available in person at Greyabbey, Co. Down, or by video and phone, which many patients prefer during treatment when travel is tiring.
Why credentials matter especially here
This is the area of practice where poor advice does the most harm, and where vulnerable people are most exploited. It is worth knowing who you are consulting.
I am a Member of the National Institute of Medical Herbalists (MNIMH), which requires accredited clinical training to degree level, professional indemnity insurance, continuing professional development, and adherence to a code of ethics. I hold a B.Th. (Hon), a Diploma in Herbal Medicine, and an Advanced Diploma in Botanical Medicine Practice, and I teach botanical medicine at degree level with the Heartwood Foundation. My specialist clinical interests include oncology support, men's health, and psychoneuroimmunoendocrinology.
I write to consultants and specialist nurses with patient consent, and I would rather a patient's oncology team knew exactly what I had prescribed than not.
Frequently Asked Questions
Can herbal medicine treat cancer?
No, and I do not offer any treatment for cancer. This service is supportive care provided alongside conventional oncology treatment — helping with side effects, fatigue, digestion, sleep, and recovery, and checking that nothing you take interferes with your treatment.
Should I tell my oncologist I am seeing a herbalist?
Yes, always, and I will give you a written summary to hand over. Undisclosed supplements are a genuine clinical risk. If your oncology team disagrees with any part of the plan, their view takes precedence.
Is it safe to take herbs during chemotherapy?
Some are, many are not, and the answer depends on your specific agents, your blood counts, and your other medication. St John's wort in particular can reduce the effectiveness of several chemotherapy and targeted therapies. High-dose antioxidants are contentious during radiotherapy and some chemotherapies. This is exactly why a professional interaction review is worth having.
Can you review the supplements I have already been given?
Yes, and this is often the single most useful part of a first appointment. Bring everything, including anything without an English label. Expect to be told to stop or pause some of it.
Can herbal medicine reduce chemotherapy side effects?
Some symptoms respond well to supportive treatment — nausea, appetite loss, constipation, disturbed sleep, and anxiety among them. Others, such as established peripheral neuropathy, respond only partially. I will tell you honestly which category your symptoms fall into.
What about after treatment finishes?
This is where I can often help most. Recovery support after discharge — fatigue, deconditioning, digestion, sleep, and fear of recurrence — is frequently under-served, and more herbal options become appropriate once active treatment is complete.
Will you ever tell me not to take something?
Frequently. A significant part of this work is subtractive, and I will also decline to prescribe where it is not in your interest — including if your aim is to avoid or delay conventional treatment.
Do you work with people supporting a family member?
Yes. Carers and partners often book on someone else's behalf or for their own exhaustion, and both are legitimate reasons to come in.
Book a supportive care consultation
Initial appointments are 60–75 minutes and include a full interaction review of everything you are currently taking, plus a written summary for your oncology team. Available in person in Greyabbey, Co. Down, or by video and phone.
This page is educational and does not constitute medical advice or a diagnosis. The Wild Sage does not offer, and does not claim to offer, any treatment for cancer. Herbal medicines are not intended to diagnose, treat, cure, or prevent any disease. Always follow the guidance of your oncology team, never stop or delay conventional cancer treatment, and never stop or alter prescribed medication without speaking to your medical team. Written and clinically reviewed by Garreth Falls MNIMH, Consultant Medical Herbalist. Last reviewed September 2026.
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