Introduction
It usually starts with a feeling that something isn’t quite right. Perhaps it is a persistent bloating after a meal that used to cause no trouble, a sudden change in your bathroom habits, or a lingering sense of fatigue that no amount of coffee seems to lift. In the UK, digestive complaints are among the most common reasons people visit their GP. However, when initial conversations don’t yield immediate answers, many of us find ourselves searching for solutions online, asking the pivotal question: what can you take to improve gut health?
The world of gut health can feel overwhelming. From probiotic supplements and prebiotic fibres to fermented drinks and "superfoods," the options are vast. But at Blue Horizon, we believe that true wellbeing isn't found in a "quick fix" supplement bottle. It comes from understanding your body as a whole. Your gut is not an isolated system; it is deeply connected to your immune system, your brain, and your hormonal health.
This article is designed for anyone feeling "stuck" with their digestive health. We will explore the various supplements, nutrients, and lifestyle changes that can support a flourishing microbiome. More importantly, we will guide you through a responsible, step-by-step approach to finding answers. We advocate for the Blue Horizon Method: starting with your GP to rule out clinical conditions, moving to structured self-tracking, and finally considering targeted blood testing to see the bigger picture of your health. If you want to compare the current thyroid options mentioned later in this guide, you can browse the full thyroid blood tests collection.
Safety Note: If you experience sudden or severe symptoms—such as intense abdominal pain, significant unexplained weight loss, blood in your stools, difficulty breathing, or swelling of the lips, face, or throat—please seek urgent medical attention via your GP, A&E, or by calling 999.
Understanding the Gut Microbiome
Before we look at what you can take, it is helpful to understand what we are trying to achieve. Your gut is home to trillions of microorganisms, including bacteria, fungi, and viruses, collectively known as the microbiome. Think of this as a complex internal garden. For a broader view of how systemic markers can fit into that picture, our article on how to check your gut microbiome is a helpful next step.
A healthy "garden" requires a diverse range of plants (beneficial bacteria), good soil (the gut lining), and the right fertiliser (nutrients and fibre). When the balance is disrupted—a state often called dysbiosis—you might experience symptoms like bloating, wind, or irregular bowel movements.
Improving gut health is rarely about "killing off" bad bacteria. Instead, it is about creating an environment where beneficial species can thrive. This involves providing the right "seeds" (probiotics) and the right "food" (prebiotics), while ensuring the rest of your body—including your thyroid and stress levels—is supporting the process.
What Can You Take: The Role of Probiotics
Probiotics are perhaps the most famous "gut health" tool. These are live bacteria and yeasts that are often called "friendly" or "good" bacteria. They are found in certain supplements and fermented foods.
Choosing the Right Probiotic
Not all probiotics are created equal. Different strains of bacteria perform different roles. For example:
- Lactobacillus: Often found in yoghurt and fermented foods, these may help with the digestion of lactose and might support those prone to diarrhoea.
- Bifidobacterium: Commonly found in dairy products, these may help ease symptoms of bloating or irregular bowel movements.
- Saccharomyces boulardii: This is actually a friendly yeast, often used specifically to support the gut during or after a course of antibiotics.
Natural Sources vs Supplements
While supplements offer a concentrated dose, you can also "take" probiotics through your diet. Traditional fermented foods such as kefir, unpasteurised sauerkraut, kimchi, and live yoghurt are excellent ways to introduce a variety of strains naturally. The benefit of food sources is that they often come packaged with other nutrients and enzymes that support digestion.
Feeding the Good Bacteria: Prebiotics and Fibre
If probiotics are the seeds, prebiotics are the fertiliser. Prebiotics are types of plant fibre that humans cannot digest, but which our beneficial gut bacteria ferment and use for fuel.
Common Prebiotics
You don't always need a supplement to increase your prebiotic intake. You can find them in:
- Onions, garlic, and leeks: These contain inulin, a well-researched prebiotic fibre.
- Slightly under-ripe bananas: These are high in resistant starch.
- Asparagus and artichokes: Excellent sources of fuel for your microbiome.
The Power of Fibre
Fibre is essential for "sweeping" the digestive tract and ensuring regular bowel movements. There are two main types:
- Soluble fibre: Found in oats, beans, and apples, this turns into a gel-like substance in the gut, which can help slow digestion and keep you feeling full.
- Insoluble fibre: Found in whole grains and vegetables, this adds bulk to the stool and helps food pass more quickly through the stomach and intestines.
For some, taking a gentle fibre supplement like psyllium husk or ground flaxseeds can be a helpful way to support regularity, but it is vital to increase your water intake at the same time to avoid further constipation.
Essential Nutrients for Gut Integrity
Beyond bacteria, your gut needs specific nutrients to maintain the integrity of its lining—a barrier often referred to as the "gut wall." If this barrier becomes compromised, it can lead to systemic inflammation.
Zinc
Zinc is a mineral that plays a crucial role in maintaining the strength of the intestinal barrier. For some, a targeted zinc supplement (often in the form of zinc carnosine) may support the repair of the gut lining.
Vitamin D
Often called the "sunshine vitamin," Vitamin D is more like a hormone that regulates the immune system. Low levels of Vitamin D have been associated with various digestive issues. Checking your Vitamin D levels is a core part of our Gold and Platinum Thyroid blood tests, as it provides a vital snapshot of your overall health.
L-Glutamine
L-Glutamine is an amino acid that serves as a primary fuel source for the cells lining the small intestine. While your body produces it naturally, during periods of high stress or illness, your gut may benefit from additional intake through protein-rich foods or a supplement.
The Stress and Gut Connection: Cortisol
We often talk about the "gut-brain axis." This is the two-way communication line between your central nervous system and your enteric nervous system (the "brain" in your gut).
When you are stressed, your body produces cortisol. High or prolonged levels of cortisol can physically alter your gut. It can slow down digestion, decrease blood flow to the digestive tract, and even change the composition of your microbiome. This is why many people experience "butterflies" or digestive upset when they are anxious. If you want a deeper explanation of this marker, our guide to thyroid tests with cortisol and magnesium explains why it appears in our thyroid panels.
At Blue Horizon, we include Cortisol as a standard "Extra" marker in all our thyroid tiers—Bronze, Silver, Gold, and Platinum. We believe you cannot look at gut health or energy levels without considering the role of the stress response. If you are taking every probiotic available but your cortisol levels are constantly elevated, your gut may struggle to heal.
The Thyroid Connection: Why Digestion Slows Down
One of the most overlooked factors in gut health is the thyroid gland. Your thyroid produces hormones that regulate your metabolism—effectively the "speed" at which your body operates.
If your thyroid is underactive (hypothyroidism), everything slows down. This includes your "gut motility"—the muscle contractions that move food through your digestive tract. This often results in:
- Persistent constipation.
- Bloating and gas due to food sitting in the gut for too long.
- A feeling of "heaviness" after meals.
Conversely, an overactive thyroid can speed things up, leading to frequent bowel movements or diarrhoea.
Why Standard Testing Might Not Be Enough
Often, a GP will check your TSH (Thyroid Stimulating Hormone). While this is an essential first step, it doesn't always tell the whole story. If your TSH is "normal" but you still have classic symptoms like constipation, fatigue, and brain fog, a more detailed look might be helpful. If you want a clear overview of the options, read our guide on what blood test for thyroid.
Our Silver Thyroid test adds Thyroid Antibodies (TPOAb and TgAb), which can indicate if your immune system is reacting against your thyroid. Our Gold and Platinum tiers go even further, looking at cofactors like Vitamin B12, Folate, and Ferritin (Iron)—all of which are essential for energy and gut health. If you want the individual product pages, the Thyroid Premium Silver and Thyroid Premium Gold tests show the full marker list.
The Blue Horizon Method: A Phased Approach
We understand the temptation to buy a dozen supplements the moment you feel bloated. However, a structured approach is more likely to lead to long-term relief and better conversations with your healthcare provider.
Step 1: Consult Your GP
Before making significant changes or ordering private tests, speak with your GP. It is important to rule out conditions such as Coeliac disease, Inflammatory Bowel Disease (IBD), or other clinical issues that require medical management. Your GP can perform standard NHS checks that provide a necessary foundation.
Step 2: The Structured Self-Check
While working with your GP, start a simple diary. Track the following for two weeks:
- Food and Drink: Note what you eat and, crucially, how you feel 30 minutes, 2 hours, and 4 hours later.
- Stress Levels: Did a busy day at work coincide with a flare-up?
- Sleep: Poor sleep can disrupt gut hormones.
- Bathroom Habits: Use the Bristol Stool Chart to note consistency and frequency.
Step 3: Targeted Testing
If you have ruled out major clinical issues with your GP but still feel "off," or if you want to understand the systemic factors affecting your gut, a blood test can provide a helpful snapshot. If you need to understand the ordering and sample process, our how to get a blood test guide explains it clearly.
For gut health, we often suggest looking at a broader health panel:
- CRP (C-Reactive Protein): Included in our Gold and Platinum tiers, this is a marker of inflammation in the body.
- Magnesium: Included in all our thyroid tiers, magnesium is essential for muscle relaxation, including the muscles of the digestive tract.
- Vitamin B12 and Folate: These are vital for cellular repair and energy. Low levels can sometimes stem from poor absorption in the gut.
Which Test Should You Choose?
If you are specifically looking at how your thyroid and systemic health might be impacting your gut, here is how our tiers break down:
- Bronze Thyroid: A focused starting point. It includes TSH, Free T4, and Free T3, plus our "Extras"—Magnesium and Cortisol. This is ideal if you want to check the basics of thyroid speed and stress.
- Silver Thyroid: Adds antibodies. This is useful if there is a family history of thyroid issues or if you suspect an autoimmune element to your symptoms.
- Gold Thyroid: Our most popular comprehensive choice. It adds Vitamin D, B12, Folate, Ferritin, and CRP (inflammation). This gives a fantastic "big picture" of the nutrients that support both the gut and the thyroid.
- Platinum Thyroid: The most detailed profile. It includes everything in Gold, plus Reverse T3, HbA1c (blood sugar over time), and a full iron panel. For the most detailed product page, see Thyroid Premium Platinum.
Note on Collection: Bronze, Silver, and Gold can be done via a simple fingerprick at home, a Tasso device, or a clinic visit. Platinum requires a professional blood draw (venous sample) due to the complexity and volume of markers. We recommend taking your sample at 9am to ensure consistency with natural hormone fluctuations.
Lifestyle Changes to Support Your Gut
While supplements can be helpful, what you "take" also includes the habits you adopt.
Mindful Eating
Digestion begins in the brain. When you see and smell food, your body begins producing saliva and digestive enzymes. If you eat while stressed, standing up, or looking at a screen, this "cephalic phase" of digestion is bypassed. Try to sit down, breathe deeply before eating, and chew your food thoroughly—this takes the pressure off your stomach and small intestine.
Hydration
Your gut requires water to produce mucus and to keep waste moving. Even mild dehydration can lead to constipation, which can then cause an imbalance in gut bacteria as waste sits in the colon for too long.
Movement
Gentle exercise, such as walking or yoga, can help stimulate the natural contractions of the gut. This is often called "mechanical" support for digestion. It also helps lower cortisol, providing a double benefit for gut health.
Interpreting Your Results
If you choose to take a Blue Horizon test, you will receive a clear, easy-to-read report. We categorize results into "normal," "outside of reference range," or "requires attention."
It is important to remember that these results are a "snapshot" in time. They are not a diagnosis. Instead, they are a tool for you to take to your GP or a qualified nutritionist. For example, if your report shows high CRP (inflammation) and low Vitamin D, it gives you a specific, evidence-based starting point for a conversation about how to support your gut and immune system. If you want a practical article on the markers behind the bigger picture, what a thyroid blood test reveals is a useful companion read.
If you are already on thyroid medication, do not adjust your dose based on a private test result. Always discuss any potential changes with your GP or endocrinologist.
Summary: A Journey to Better Gut Health
Improving your gut health is a journey of discovery rather than a destination reached by a single pill. By focusing on a diverse diet rich in fibre and fermented foods, managing stress, and ensuring your thyroid is functioning optimally, you can create a resilient and healthy microbiome.
Remember the phased approach:
- Rule out clinical concerns with your GP.
- Track your symptoms and lifestyle to find patterns.
- Investigate systemic factors like inflammation, stress (cortisol), and thyroid health through structured testing if symptoms persist.
By looking at the bigger picture—including those "extra" markers like magnesium and cortisol—you can move away from guesswork and toward a more informed, empowered version of yourself. You can view current details on our thyroid testing range on the thyroid blood tests collection.
FAQ
What are the best supplements for gut health?
There is no single "best" supplement, as the right choice depends on your specific symptoms. However, many people find benefit from a high-quality probiotic with diverse strains, prebiotic fibres like inulin, or nutrients like Vitamin D and Zinc which support the gut lining. It is always best to check your current nutrient levels via a blood test before starting high-dose supplementation.
Can a thyroid problem cause gut issues?
Yes, the thyroid and the gut are closely linked. An underactive thyroid (hypothyroidism) can slow down the movement of food through the digestive tract, leading to constipation and bloating. Conversely, an overactive thyroid can cause faster transit times. If you have persistent gut issues alongside fatigue or weight changes, checking your thyroid function—including Free T4 and Free T3—may be helpful.
How long does it take to improve gut health?
The gut microbiome is dynamic and can begin to change within days of dietary adjustments. However, repairing the gut lining or rebalancing a significantly disrupted microbiome often takes several weeks or even months. Consistency with diet, stress management, and sleep is more important than short-term, intensive "cleanses."
Why should I test for cortisol when looking at gut health?
Cortisol is the body's primary stress hormone. High levels of cortisol can reduce blood flow to the digestive system and weaken the gut barrier. By checking your cortisol levels, you can see if stress might be a physical barrier to your gut healing, regardless of how well you are eating.
