Vitamins and Supplements — During Chemotherapy
Some supplements are part of your chemotherapy plan and given for specific clinical reasons. Others — especially high-dose vitamins bought over the counter — can work against your treatment. The difference matters, and your team needs to know everything you are taking.
Medically reviewed by Dr. Bharati Devi Gorantla, Medical Oncologist, MBBS · MD · DM (Adyar, Chennai) · ECMO · MRCP SCE (UK) · Last reviewed September 2026
- Some are prescribed — Vitamin D3, calcium, B12, and folic acid are often prescribed alongside chemotherapy for reasons specific to your regimen.
- Some may interfere — High-dose antioxidants such as Vitamin C and Vitamin E may reduce how well certain chemotherapy drugs work.
- Herbal counts too — Turmeric capsules, ashwagandha, and kadha are supplements. Your oncologist needs to know about them.
- Natural does not mean safe here — Most patients assume herbal products are separate from their medical treatment. They are not.
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Some supplements are prescribed during chemotherapy to support your body. Others — especially high-dose antioxidants — may reduce how well treatment works. Your oncologist needs to know about everything you are taking before your next session, including herbal preparations and traditional remedies.
Which supplements are commonly prescribed during chemotherapy?
Vitamin D3 — sold as Calcirol, D-Rise, and Uprise-D — is prescribed when blood tests show deficiency, which is very common in India. Low Vitamin D affects immune function and bone strength, both of which matter during treatment.
Calcium carbonate, such as Shelcal, is often given alongside Vitamin D3 or with regimens that affect bone density over time. Vitamin B12, available as Methylcobal, supports nerve health — particularly relevant if your regimen includes drugs that affect the nerves.
Folic acid, sold as Folvite, is sometimes prescribed alongside specific chemotherapy drugs to reduce particular side effects. It has a specific clinical role, not a general nutritional one. Do not start or stop any prescribed supplement without asking your oncologist, even if a friend or family member was given the same thing.
What should you tell your oncologist about supplements?
- The full name and brand of every supplement, vitamin, or mineral you take
- Anything prescribed by another doctor, including a general physician or gynaecologist
- Herbal or ayurvedic preparations — including ashwagandha, triphala, or any churna or kadha
- Protein powders and health drinks such as Protinex or Ensure
- Anything you have started or stopped since your last appointment
- Anything a family member or well-wisher has suggested you try
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Do antioxidant supplements interfere with chemotherapy?
This is the most important supplement question for people on chemotherapy, and the honest answer is: possibly, at high doses.
Several chemotherapy drugs work partly by generating oxidative stress inside cancer cells. High-dose antioxidants — including Vitamin C tablets, Vitamin E capsules, and beta-carotene — are designed to neutralise exactly that kind of damage. ASCO and ESMO guidance both advise against antioxidant supplements above normal dietary levels during active treatment.
Curcumin capsules and extracts are widely taken in India. Cooking with turmeric is not the concern. High-dose curcumin supplements affect how the liver processes certain drugs, and ASCO integrative oncology guidance recommends discussing them with your oncologist before continuing.
A normal diet rich in fruit and vegetables is not the problem. Megadose supplements bought specifically for their antioxidant effect are a different category entirely.
Did you know?
A large proportion of people taking supplements or herbal preparations during chemotherapy do not mention it to their oncologist — most often because they assume natural products are separate from medical treatment.
ASCO integrative oncology guidance identifies this disclosure gap as one of the most frequent sources of missed interactions between supplements and chemotherapy drugs.
Source: American Society of Clinical Oncology (ASCO) integrative oncology guidance
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Frequently asked questions
Is it safe to take a daily multivitamin during chemotherapy?
A standard multivitamin at normal levels is unlikely to cause a significant interaction, but this depends on what is in it and what chemotherapy you are receiving. Products such as Supradyn, Becosules, and Revital all have different compositions. Bring the packet to your next appointment and let your team confirm whether to continue, hold, or switch.
Why do antioxidants specifically concern oncologists during chemotherapy?
Several chemotherapy drugs work by generating oxidative damage inside cancer cells. High-dose antioxidants are designed to neutralise exactly that kind of damage — the concern is that, at megadose levels, they may reduce the treatment's effect at the same time. The degree of risk varies by drug and dose. ASCO and ESMO both advise against high-dose antioxidant supplements during active treatment until your oncologist has been consulted.
Can I take turmeric capsules or ashwagandha during chemotherapy?
Cooking with turmeric is not the concern — high-dose curcumin capsules are, because they affect how the liver processes certain drugs. Ashwagandha has effects on drug metabolism and on certain hormone-sensitive pathways. Both are worth discussing with your oncologist before continuing, particularly if you have recently increased the dose or started them during your current treatment.
My oncologist prescribed Vitamin D3. Is that the same as buying it over the counter?
Your oncologist prescribed it at a level matched to your blood test result. Prescription forms such as Calcirol sachets or Uprise-D capsules deliver a defined amount. Over-the-counter products vary in strength. Do not switch brands or adjust what you are taking without checking first. If you have been buying a different form alongside the prescription, bring both to your next appointment.
What about iron tablets during chemotherapy?
Iron supplementation during chemotherapy is decided based on blood tests, not on how tired you feel. The right approach depends on the cause of any anaemia, which your team can determine from results. If your team has prescribed iron — brands such as Feronia, Dexorange, or Livogen — continue as instructed. If you have bought iron tablets yourself, tell your team before your next cycle.
Should I stop all supplements before starting chemotherapy?
Do not stop or start anything on your own before chemotherapy begins. Bring everything you are currently taking to your first or next appointment — supplements, vitamins, herbal products, and anything from an ayurvedic practitioner or health store. Your oncologist will tell you what to continue, hold, or stop. The answer is specific to your regimen, not a blanket rule.
I have been taking supplements and did not mention it to my oncologist. What should I do?
Tell your team at your next appointment, or call today if that is more than a week away. This is common and your team will not judge you. Bring the actual packets so they can see exactly what each one contains. If you are worried about a specific supplement you have taken throughout your treatment, that is a reason to call sooner rather than later.
What about high-dose Vitamin C specifically?
Food and a standard multivitamin are not the concern. High-dose Vitamin C tablets or effervescent sachets taken specifically for immune boosting are what ASCO and ESMO flag during active chemotherapy. The evidence does not support them for strengthening immunity during treatment, and the concern about interfering with chemotherapy's mechanism is enough for most oncologists to recommend holding them until treatment is complete. Tell your team what you have been taking.
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