Post Author: Victoria Tyler
How to treat Candida Overgrowth in the Gut
Treating Candida overgrowth in the gut is not simply about taking antifungal supplements or following a strict Candida cleanse.
The first step is to work out whether Candida is genuinely contributing to your symptoms and what may have allowed it to increase, such as antibiotics, steroids, a high sugar diet or a weakened immune system.
Successful treatment includes addressing these underlying causes, improving your diet, supporting the gut microbiome with carefully chosen probiotics and, where appropriate, using antifungal treatment.
Extreme diets and taking several antifungal supplements at once are rarely necessary and may make digestive symptoms worse.
What is Candida?
Candida is a type of yeast that naturally lives in the human body. It can be found in the digestive tract, mouth, skin and genital area. In small amounts, Candida is usually harmless and forms part of the community of bacteria, yeasts and other microorganisms known as the microbiome.
The most common species is Candida albicans, although other species, including Candida glabrata and Candida tropicalis, may also be present.
Candida only tends to become a problem when the normal balance of the microbiome is disturbed. This may happen after taking antibiotics, during periods of poor diet, when the immune system is weakened or when intestinal movement is unusually slow.
Under favourable conditions, Candida can multiply and change from a rounded yeast form into longer, thread-like structures known as hyphae. These structures can help Candida attach to surfaces and form protective communities called biofilms.
However, simply finding Candida in the digestive tract does not mean that it is causing an infection or your symptoms. Many healthy people naturally carry Candida without experiencing any problems.
This is particularly important because symptoms commonly associated with “gut Candida”, such as bloating, gas, abdominal discomfort, tiredness and changes in bowel movements, can also be caused by IBS, SIBO, constipation, food intolerances or other digestive conditions.
The aim should therefore not be to remove every trace of Candida. Instead, treatment focuses on understanding whether Candida may be contributing to your symptoms, identifying what has disrupted the gut environment and restoring a healthier microbial balance.
This article explains what Candida is, how overgrowth develops, how to approach treatment and the testing options I use in practice.
How does Candida overgrow in the gut?
Antibiotic use
Recent or repeated courses of broad-spectrum antibiotics are among the biggest factors associated with increased Candida colonisation.
Antibiotics kill harmful bacteria, but they can also reduce beneficial species that normally compete with Candida and limit its growth. When this natural protection is weakened, Candida may have more opportunity to multiply.
This does not mean that everyone who takes antibiotics will develop Candida overgrowth. The effect depends on the antibiotic used, the person’s existing microbiome and whether other risk factors are present.
Slow intestinal movement
The intestines use coordinated muscular contractions to move food and microorganisms through the digestive tract. If this movement becomes impaired, bacteria and fungi may remain in the small intestine for longer than usual.
Research has associated intestinal dysmotility with small intestinal bacterial and fungal overgrowth. Slow movement may occur with certain medical conditions, some medications and following particular forms of gastrointestinal surgery.
Constipation alone does not prove that Candida is present, but persistent slow transit may be one factor worth addressing as part of a wider treatment plan.
Proton-pump inhibitors
Proton-pump inhibitors, or PPIs, include medicines such as omeprazole, lansoprazole and esomeprazole. They reduce stomach acid and are commonly prescribed for reflux and stomach ulcers.
Stomach acid is part of the body’s natural defence against microorganisms entering the digestive tract. Research has found an association between PPI use and small intestinal bacterial or fungal overgrowth, as well as changes in the fungal community of the stomach.
However, this evidence does not show that everyone taking a PPI will develop Candida overgrowth. Prescribed medication should not be stopped without discussing it with a doctor.
A disrupted gut microbiome
The bacteria and fungi living in the gut influence one another. Beneficial bacterial species help prevent Candida from expanding by competing for space and nutrients and by producing substances that make the environment less favourable for fungal growth.
Antibiotics, illness and other major disturbances to the microbiome may weaken this natural resistance. Candida may then become more abundant, although a higher level does not necessarily mean that it is causing digestive symptoms.
Diabetes
People with poorly controlled diabetes have a greater risk of several forms of candidiasis, including oral and genital thrush. Higher glucose levels, altered immune function and slower digestive movement may all contribute.
However, the evidence linking diabetes specifically to symptomatic intestinal Candida overgrowth is less clear. Diabetes should therefore be considered as a possible contributing factor rather than proof that Candida is causing digestive symptoms.
Corticosteroids and immune-suppressing medicines
Corticosteroids and other medicines that suppress the immune system can reduce the body’s ability to keep Candida under control. They are well-recognised risk factors for oral, oesophageal and more serious Candida infections, particularly when used at high doses or for long periods.
Inhaled corticosteroids can also increase the risk of oral thrush. Rinsing the mouth after using a steroid inhaler may help reduce this risk.
These medicines do not automatically cause intestinal Candida overgrowth, and they should never be stopped without medical advice.
Can Stress and a Weakened Immune System Contribute to Candida?
If you are under constant stress, sleeping badly or feeling run down, your immune system may be less effective at keeping Candida under control. This does not mean stress directly causes Candida overgrowth, but it may make you more vulnerable.
Supporting your sleep, stress levels and overall immune health can therefore be an important part of recovery.
Surgery, structural changes and serious illness
Certain operations or structural changes in the digestive tract can slow the movement of intestinal contents and create areas where microorganisms can collect. This may increase susceptibility to bacterial and possibly fungal overgrowth in some people.
Severe illness, major abdominal surgery and profound immune suppression also increase the risk of serious Candida infection. This is very different from the nonspecific bloating, gas and bowel changes commonly attributed to “gut Candida”.
Invasive candidiasis is a serious medical condition requiring urgent medical assessment and prescription antifungal treatment.
In most people with digestive symptoms, there is unlikely to be one single cause. Several factors may occur together—for example, antibiotics followed by altered bowel movements and disruption of the gut microbiome. Treatment should therefore focus on the wider gut environment rather than simply trying to eliminate every trace of Candida.
Diet
If you have been consuming a diet that is relatively high in sugars and ultra-processed foods, this may cause the species of yeast/ candida to grow and proliferate.
A diet high in sugary, ultra-processed foods will disturb the bacterial microbiome and provide less fibre to support beneficial bacteria.
If your diet has been low in vegetables and high in sugar, it is likely that you will be deficient in short-chain fatty acids, such as Butyrate. Butyrate supports the gut lining and helps prevent Candida’s virulence. The good news is when you incorporate more vegetables and healthy foods and cut out sugar, you should feel better.
What are the symptoms of Candida Overgrowth
Common symptoms of Candida may include:
- Bloating
- Gas
- Abdominal discomfort
- Loose stools or constipation
- Rectal itching
- Sugar cravings
- Brain fog and fatigue
- Oral thrush
- Vaginal thrush
- Jock itch
- Fungal toenails- yellowing of your big toe
- Athletes foot
How to treat candida overgrowth in the gut
Treating Candida overgrowth in the gut is about reducing the overgrowth and restoring balance not doing extreme cleanses.
There is no good evidence that everyone with suspected Candida needs to avoid all fruit, bread, starches, gluten or carbohydrates.
Start by reducing foods that provide little nutritional value, including sweets, cakes, biscuits, sugary drinks and heavily processed snacks. Excessive alcohol should also be limited, particularly if it worsens digestive symptoms or recurrent thrush.
Meals should include enough protein from foods such as eggs, fish, poultry, meat, tofu or legumes. Include a range of tolerated vegetables and sources of plant fibre to support beneficial gut bacteria.
Patients who also have IBS or SIBO may temporarily struggle with certain fermentable vegetables such as cabbage, onions, garlic, beans or pulses and excess fibre. In these cases, a low sugar SIBO diet may help.
There is usually no need to remove all carbohydrates. Excellent options may include oats, rice, quinoa, potatoes and buckwheat.
This is particularly important for anyone who is underweight, losing weight or already eating a very restricted diet. Removing more foods may worsen nutritional deficiencies and digestive function rather than helping recovery.
I normally work with patients by removing the foods that drive the overgrowth (sugar, yeast, alcohol) and add in some gentle antifungals and probiotics,
Step 1 involves following a diet for Candida, the key is to have lots of protein, eggs, fish, meat and reduce cakes, biscuits, sugars and yeast as well as alcohol for 4 weeks, After this point you should improve and hopefully will be able to cheat 20% of the time.
What can I eat on the Candida diet?
Below is a list of foods that are generally very well tolerated.
- Fresh fish and seafood
- Poultry
- Lean meats
- Organic eggs
- Salads
- Green vegetables
- Legumes, beans and pulses such as lentils
- Fresh nuts and seeds
- Yeast free breads or wraps
- Brown rice, quinoa, millet, buckwheat, potatoes-
The Best Supplements for Candida Overgrowth and thrush
Below are the Candida supplements I most often use in clinic. It is essential to follow the anti-candida diet at the same time as taking the supplements.
My favourite Candida supplement is Caprylic acid. It is based from coconut.
Generally this candida supplement is very tolerated but the response is individual and it is recommended that you seek help from a professional as candida die-off reactions are very common.
Feeling worse after starting an antifungal supplement should not automatically be described as “Candida die-off”. It may simply mean that the herb or dose is not well tolerated.
Below is a list of herbal antifungals that can help the overgrowth. Many of these are very potent and it is essential to work with a qualified practitioner as side-effects are common.
- Caprylic acid
Dose: 500 mg, 2 x daily with food.
Notes: If stools loosen, reduce dose - Berberine (from barberry/berberis, Oregon grape, goldenseal)
Dose: 500 mg, 1 daily with meals (4 weeks).Notes: Avoid in pregnancy/breastfeeding; interacts with some medicines (e.g., ciclosporin, tacrolimus, some statins); can lower blood sugar. - Garlic – this is generally well tolerated
Dose: Aged garlic extract 600–1,200 mg/day;Notes: May thin blood—use caution with anticoagulants or before surgery.
- Undecylenic acid
Dose: 150mg, 1–2× daily with food (4–6 weeks). This is a Potent fatty-acid antifungal that targets yeast cell membranes.
Notes: Can cause mild GI upset—start low and build. - Grapefruit seed is another supplement that can be used but in some cases it cause diarrhoea.
Probiotics for Candida
Beneficial probiotics and gut bacteria help reduce Candida by competing for nutrients and space and by producing substances that make the intestinal environment less favourable for fungal growth.
Research suggests that in some cases some Lactobacillus strains can reduce Candida colonisation.
It is important to introduce probiotics gradually, especially in people with significant bloating or suspected SIBO. Sometimes probiotics can aggravate SIBO.
Saccharomyces boulardii is a beneficial yeast that may help support the gut following antibiotics or diarrhoea.
Below is a list of probiotics that may be used for Candida Overgrowth.
- Saccharomyces boulardii
Dose: 5–10 billion CFU, 1–2× daily.
This is A beneficial yeast that competes with Candida and may be helpful for loose stools.
Notes: Use caution in severely immunocompromised patients. - Lactobacillus & Bifidobacterium blends (e.g., L. rhamnosus GG, L. reuteri, L. plantarum, B. lactis)Dose: 10–50 billion CFU/day.
This helps restore a healthy pH and produce acids that discourage yeast. This is my favourite.
Notes: Start low and build; rotate strains every 4–6 weeks.
Pharmaceutical Antifungals for Candida
Prescription antifungal medicines may be used when you have a confirmed Candida infection. Nystatin is often used for oral thrush and works mainly within the mouth or digestive tract, while fluconazole is absorbed into the bloodstream and may be prescribed for oral, oesophageal or vaginal Candida infections.
Biofilm & die-off support (use alongside antifungals)
Candida Die-off symptoms are common when you start a candida protocol and the following may help:
- N-acetylcysteine (NAC)
Dose: 600 mg, 2–3× daily away from food.
Helps break down biofilms and supports liver detox pathways.
Notes: May irritate if you have active gastritis/ulcers. - Lactoferrin (bovine)
Dose: 250–500 mg, 1–2× daily away from dairy.
Disrupts microbial adhesion; synergises with antifungals.
Notes: Avoid if you have an allergy to dairy - Proteolytic enzymes (e.g., serrapeptase)
Dose: Per label, typically once daily away from food.
May help degrade biofilm proteins.
Notes: Use caution with blood thinners. - Short-term binders for “die-off” (optional)
Activated charcoal / bentonite clay: 500–1,000 mg once daily, away from meds/supps, for 3–5 days only.
Notes: Can cause constipation and reduce absorption—keep water intake up; not for long-term use. - Avoid during pregnancy/breastfeeding
If you take anticoagulants, immunosuppressants, diabetes medications, or statins, or have liver/kidney disease, get personalised advice some supplements interact.
Can you cure Candida naturally and permanently?
It is not usually helpful to think of Candida as something you need to remove from the body forever. Candida can live naturally in the mouth, gut, skin and genital area without causing symptoms. The aim is to stop it becoming overgrown and to restore a healthier gut environment.
The most effective natural approach is to reduce excessive sugar, alcohol and ultra-processed foods, improving bowel regularity, and rebuilding the gut microbiome with a varied diet and carefully chosen probiotics.
This may reduce the chance of Candida becoming a recurring problem, especially after antibiotics.
How long does Candida treatment take?
Some patients may notice improvements within 2-4 weeks, particularly when a clear trigger such as recent antibiotic use, constipation or a poor-quality diet is addressed.
Others may not improve because Candida was not the main cause of their symptoms.
If symptoms worsen or do not improve, do not keep adding stronger antifungal products or removing more foods.
Further investigation may be needed for other underlying causes such as SIBO, constipation, IBS, coeliac disease, inflammatory bowel disease, food intolerances or another digestive condition.
If you are unsure if candida is driving your symptoms, you should consider testing for candida overgrowth in the gut.
Does the NHS Treat Candida Overgrowth in the Gut?
The NHS treats recognised Candida infections such as oral thrush, vaginal thrush, skin infections, balanitis and serious invasive Candida infections. These may be treated with antifungal medicines such as nystatin, clotrimazole or fluconazole, depending on the type anseverity of the infection.
However, the NHS does not usually diagnose or treat “Candida overgrowth in the gut” as a routine explanation for bloating, fatigue, brain fog or IBS-type symptoms. This is because Candida can naturally live in the digestive tract without causing disease, and a positive stool test does not automatically prove that Candida is responsible for your symptoms.
If you have persistent digestive symptoms, your GP may investigate more common causes such as IBS, coeliac disease, inflammatory bowel disease, constipation, infection or bacterial infections.
How Do You Test for Candida Overgrowth in the Gut?
There is no single simple test that can reliably diagnose Candida overgrowth in the gut.
Candida may appear on a stool culture or PCR test, but this does not automatically mean it is causing your symptoms because small amounts can be present in healthy people.
Stool testing can still provide useful information about the species and the wider gut microbiome, but the result must be considered alongside your symptoms and medical history.
The most direct test for small intestinal fungal overgrowth, known as SIFO, is a sample of fluid taken from the small intestine during an endoscopy and sent for fungal culture. However, this is invasive and not widely available. Blood antibody tests and urine organic acids tests are not considered reliable stand-alone tests for intestinal Candida, while the popular Candida spit test has not been scientifically validated.
Below are some of the functional medicine tests that are frequently used:
Stool PCR/culture for Candida:Stool tests are popular tests. In addition to Candida these tests are able to detect other strains of yeast and look at other pathogens including bacteria, viruses, salmonella, shigella and parasites.
In many cases these stool tests can reveal your specific strain of yeast as well as the most effective antifungals to take to treat the yeast overgrowth.
The candida overgrowth urine test looks at a marker called Arabinose. The test is called an organic acid test and can be indicative of an overgrowth in the small intestine.
There is also a Candida IgG blood test: this test shows if you had an infection in the past but will not tell you if it is still active now.
If you would like more information on Candida overgrowth testing options please visit our dedicated page.
Can Candida affect men?
Yes. Men can develop oral thrush, balanitis (yeast on the glans/foreskin), and the same gut-related symptoms. Triggers are the same: antibiotics, high-sugar diets, steroids, imbalances in the gut microbiome/ dysbiosis.
Conclusion: how you can overcome Candida overgrowth naturally
You don’t need an extreme “cleanse” to feel better—you need a gentle stepwise plan you can stick to:
Start with Anti-candida Diet (4 weeks).
Tidy up your diet (lower free sugars and ultra-processed foods, keep protein and fibre steady), drink enough water, and get bowels moving daily.Take antifungals (4 weeks).
Discuss your symptoms with a professional and decide what the most appropriate anti-fungal is for you (e.g., caprylic acid, berberine, undecylenic/caprylic acids, or allicin) rather than stacking many. Take it with food, monitor how you feel, and stop if you react.Rebuild with targeted probiotics (4–8 weeks).
Prioritise Saccharomyces boulardii and a proven Lactobacillus strain (e.g., rhamnosus GG) to maintain gains and support resilience.Reintroduce foods
Add back one item at a time, every 2–3 days, watching symptoms.Support Stress
Sleep, stress management, gentle movement, and consistent mealtimes all tilt your gut ecosystem in the right direction.Know when to get help.
If symptoms persist, consider testing (stool, SIBO/SIFO)
Need help? Book a consultation with a candida specialist
While anti-fungals and anti-candida diets may offer benefits for an overgrowth, self-treatment can lead to unintended consequences such as anti-fungal resistance, gut imbalances, or worsening symptoms.
A healthcare professional can provide a tailored plan, monitor progress, and recommend complementary strategies like dietary modifications and probiotics to support gut health.
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Author – Victoria Tyler BSc Hons MBANT
Victoria Tyler owns and runs two busy clinics : Nutrition and Vitality and the IBS and Gut Disorder Clinic.
Nutrition and Vitality, along with the IBS and Gut Disorder Clinic, were founded with the goal of helping patients alleviate IBS symptoms by uncovering and addressing the root causes of their digestive issues.
As a Registered Nutritional Therapist, Victoria holds a BSc (Hons) in Nutritional Therapy and has trained with the Institute of Functional Medicine. She is also accredited by BANT and CNHC.
Before transitioning into health, Victoria earned a degree in Economics and an MBA, working with corporations including Canon and Vodafone. However, her own health challenges led her to pursue a career in Nutritional Therapy.
With a passion for learning, Victoria is committed to staying at the forefront of Functional Medicine. She helps patients manage IBS and other digestive disorders, including SIBO, Candida, and IBD, by identifying and addressing their root causes.
Victoria strongly believes that every symptom has an underlying cause, and there is always a solution to every health condition. To learn more, or to see patient reviews, visit Victoria’s profile on Google.
DISCLAIMER: The information provided in this article is intended for general informational purposes only and should not be construed as medical advice, diagnosis, or treatment. The products and methods mentioned are not a substitute for professional medical advice from a trained healthcare specialist. Always seek the guidance of your doctor or other qualified health professional with any questions you may have regarding your health or a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read on this website. Use of the information and products discussed is at your own risk.
