Introduction
If you have spent any time looking into digestive wellness, you will know how frustrating persistent "mystery symptoms" can be. Waking up with a flat stomach only to feel uncomfortable and bloated by mid-afternoon, dealing with sluggish digestion, or noticing that your skin and hair feel lacklustre alongside your digestive changes can leave you searching for answers.
In recent years, biotin—also known as vitamin B7—has dominated headlines as a beauty supplement for hair and nails. However, an increasing number of people are asking a deeper question: is biotin good for gut health?
The relationship between biotin and your digestive tract is far more intricate than most beauty marketing suggests. Biotin is not merely a cosmetic nutrient; it is a fundamental metabolic cofactor that interacts directly with your intestinal lining and your gut microbiome. In fact, your digestive tract is both a consumer and a producer of this essential B vitamin.
This article explores the clinical science behind biotin and digestive health, examines how your microbiome influences your vitamin levels, outlines common signs of deficiency, and explains why high-dose supplements require careful handling.
At Blue Horizon, we believe that understanding your health should never rely on quick fixes or isolated supplements. We advocate a calm, phased approach: consulting your GP first to investigate underlying symptoms, using structured tracking to spot patterns, and considering targeted blood testing when you need a clear, objective view of your internal wellness.
Understanding Biotin: More Than a Beauty Vitamin
Biotin is a water-soluble B-complex vitamin that your body requires to carry out essential metabolic reactions. Because it is water-soluble, your body cannot store large amounts in tissue for long periods; regular intake and steady internal production are necessary to maintain healthy physiological function.
At a cellular level, biotin acts as an indispensable prosthetic group—a non-protein helper molecule—for five distinct mammalian carboxylase enzymes:
- Acetyl-CoA carboxylase 1 and 2 (ACC1 and ACC2): These enzymes regulate the synthesis and breakdown of fatty acids, which are crucial for cellular structure and the integrity of biological membranes.
- Pyruvate carboxylase: A key enzyme in gluconeogenesis (the production of glucose from non-carbohydrate sources), ensuring your cells have a constant supply of fuel during fasting or energy expenditure.
- Propionyl-CoA carboxylase: Essential for metabolising specific amino acids and odd-chain fatty acids into usable energy.
- Methylcrotonyl-CoA carboxylase: Required for the breakdown of leucine, an essential branched-chain amino acid.
In plain terms, biotin helps your cells turn the fats, proteins, and carbohydrates from your meals into usable energy. Without sufficient biotin, your cellular engines slow down.
While beauty products highlight biotin because rapid-turnover tissues like hair follicles and nail beds require substantial cellular energy and fatty acid production, the very same biological mechanisms apply to your digestive tract. The cells lining your gut are among the fastest-dividing cells in the entire human body, making them exceptionally sensitive to metabolic support.
The Two-Way Connection Between Biotin and the Gut
The relationship between biotin and your digestive system is uniquely bidirectional. Your gut environment directly governs how much biotin you absorb and produce, while biotin actively supports the physical structures that keep your gut healthy.
┌────────────────────────────────────────────────────────┐
│ THE TWO-WAY GUT-BIOTIN AXIS │
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│
┌─────────────────────────┴─────────────────────────┐
▼ ▼
┌─────────────────────────────────┐ ┌─────────────────────────────────┐
│ HOW THE GUT HELPS BIOTIN │ │ HOW BIOTIN HELPS THE GUT │
├─────────────────────────────────┤ ├─────────────────────────────────┤
│ • Healthy microbiome synthesises│ │ • Fuel for rapid epithelial │
│ free B7 in the large bowel. │ │ cell renewal & repair. │
│ • Intestinal enzymes (biotin- │ │ • Supports mucosal lining │
│ idase) release dietary B7. │ │ barrier integrity. │
│ • hSMVT transporters absorb B7 │ │ • Regulates local inflammatory │
│ across mucosal membranes. │ │ signalling pathways. │
└─────────────────────────────────┘ └─────────────────────────────────┘
1. How Your Microbiome Synthesises Biotin
Unlike many other essential vitamins that must come entirely from the food on your plate, biotin can be synthesised internally by healthy gut bacteria. Strains belonging to the Bacteroides and Prevotella genera, alongside certain Bifidobacterium species, possess the genetic machinery to produce biotin within the large intestine.
This bacterially produced biotin is absorbed in the colon via specialised transport proteins known as human sodium-dependent multivitamin transporters (hSMVT). While dietary biotin is primarily absorbed higher up in the small intestine, this colonic synthesis provides a steady baseline contribution to your body's overall nutritional status.
For further reading on the microbiome and digestive wellness, explore Blue Horizon’s gut health and microbiome guides.
2. How Digestive Enzymes Release Biotin
Much of the biotin found naturally in whole foods is bound to proteins. To make use of it, your digestive system must first break these bonds.
In your stomach and small intestine, pancreatic proteases break down whole proteins into smaller fragments called biocytin (biotin bound to the amino acid lysine). An enzyme located in the intestinal brush border called biotinidase then cleaves biocytin, freeing the pure biotin molecule so that it can be absorbed across the intestinal wall into your bloodstream.
If your digestion is compromised—whether due to low stomach acid, reduced pancreatic enzyme output, or inflammation along the brush border—this enzymatic cleavage can become less efficient, leading to reduced nutrient uptake even if your diet appears nutritionally adequate.
3. The Impact of Gut Dysbiosis and Malabsorption
When the delicate balance of your microbiome is disrupted—a state known as dysbiosis—the consequences for your vitamin levels can be two-fold:
- Loss of biotin-producing flora: A reduction in beneficial bacterial populations (for example, following repeated courses of broad-spectrum antibiotics) can significantly diminish internal biotin synthesis.
- Impaired mucosal uptake: Inflammatory changes in the gut lining can reduce the expression of hSMVT transporters, hindering both dietary and microbial biotin absorption.
Conditions associated with intestinal inflammation or mucosal damage, such as untreated coeliac disease, inflammatory bowel diseases (Crohn's disease or ulcerative colitis), or small intestinal bacterial overgrowth (SIBO), can impair normal absorption pathways. This explains why individuals with chronic digestive complaints often show sub-optimal levels of various micronutrients, including B vitamins.
Is Biotin Good for Gut Health? The Clinical Evidence
When looking at whether biotin can actively support or improve gut health, clinical research points to several specific physiological benefits. Rather than acting as a superficial digestive soothe, biotin functions at the root level of tissue maintenance and immune balance.
Supporting Intestinal Barrier Integrity
Your intestinal tract is lined by a single layer of epithelial cells connected by tight junction proteins. This mucosal barrier acts as a selective filter: it allows vital nutrients, water, and electrolytes to pass into your bloodstream while keeping undigested food particles, toxins, and pathogenic microbes safely inside the digestive tract.
Key Clinical Insight: Biotin is essential for the synthesis of cellular fatty acids and structural proteins that reinforce these tight junctions. Preclinical studies indicate that biotin deficiency compromises the integrity of the intestinal epithelial barrier, leading to increased intestinal permeability and local irritation.
By supporting normal cellular lipid synthesis, adequate biotin levels help maintain the robust mucosal architecture necessary to prevent unwanted substances from irritating the underlying immune tissue.
Providing Cellular Energy for Rapid Tissue Renewal
The epithelial lining of your gut undergoes complete renewal roughly every three to five days. This rapid turnover requires a tremendous amount of metabolic fuel.
Because biotin is a necessary cofactor for pyruvate carboxylase and other central metabolic enzymes, it directly fuels the mitochondrial energy cycles within enterocytes (gut cells). Adequate biotin availability ensures that when cells are shed through normal digestion, healthy new cells can take their place without delay or structural weakness.
Regulating Inflammatory Signalling
A significant portion of the body's immune system resides in the gut-associated lymphoid tissue (GALT). Research into cellular immunology has revealed that biotin plays a regulatory role in cytokine production.
When biotin levels fall below optimal ranges, immune cells have been observed to produce higher amounts of pro-inflammatory signalling molecules, such as interleukin-1 beta (IL-1β) and tumour necrosis factor-alpha (TNF-α). Maintaining healthy biotin status helps modulate these pathways, keeping the natural inflammatory response balanced and preventing unnecessary low-grade irritation across the digestive mucosa.
Supporting Neuromuscular Motility
Digestive comfort depends heavily on smooth, coordinated muscular contractions throughout the stomach and intestines—a process known as gut motility. Sluggish motility can lead to food lingering too long in the upper digestive tract, encouraging excessive fermentation, gas accumulation, and that heavy, distended feeling after meals.
Biotin supports the peripheral nervous system and the enteric nervous system (the network of nerves controlling your gut). By contributing to normal nerve signal transmission and cellular energy production in intestinal smooth muscle, biotin helps support regular, rhythmic peristalsis.
Signs of Biotin Depletion and Digestive Overlap
Because biotin plays roles in energy production, mucosal health, and nervous system signalling, low levels can produce symptoms that span multiple bodily systems. In many cases, these signs overlap with common digestive, metabolic, or hormonal complaints.
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│ COMMON SIGNS OF BIOTIN DEPLETION │
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▼ ▼ ▼
┌──────────────────┐ ┌──────────────────┐ ┌──────────────────┐
│ GASTROINTESTINAL │ │ DERMATOLOGY │ │ SYSTEMIC / NEURO │
├──────────────────┤ ├──────────────────┤ ├──────────────────┤
│ • Bloating & gas │ │ • Thinning hair │ │ • Unexplained │
│ • Sluggish bowel │ │ • Brittle nails │ │ fatigue │
│ motility │ │ • Red, scaly dry │ │ • Low mood or │
│ • Mild nausea │ │ rashes around │ │ lethargy │
│ • Appetite loss │ │ mouth/nose │ │ • Muscle aches │
└──────────────────┘ └──────────────────┘ └──────────────────┘
Recognising these overlapping symptoms is vital. If someone experiences ongoing digestive bloating alongside thinning hair and low energy, it is easy to assume biotin is the single "missing piece." However, these exact same symptoms can arise from:
- Thyroid imbalances: An underactive thyroid (hypothyroidism) frequently causes constipation, bloating, dry skin, fatigue, and diffuse hair loss.
- Iron deficiency anaemia: Low ferritin levels reduce oxygen delivery to tissues, causing fatigue, hair shedding, and poor digestive resilience.
- Vitamin B12 or folate deficiency: Deficiencies in other B vitamins can lead to mucosal inflammation, digestive changes, and profound tiredness.
- Underlying gastrointestinal conditions: Chronic malabsorption from coeliac disease or IBD requires formal medical diagnosis and targeted clinical management, not over-the-counter vitamin supplementation.
For a broader look at thyroid symptoms and overlapping nutrient concerns, read this guide to choosing the right thyroid blood test.
Risk Factors for Low Biotin Status
While severe, clinical biotin deficiency is relatively rare in the UK due to widespread dietary availability, marginal or sub-optimal status can occur under specific circumstances:
- Prolonged antibiotic use: Disrupts the gut microflora responsible for endogenous B7 synthesis.
- Chronic digestive disorders: Conditions causing chronic diarrhoea, mucosal inflammation, or short-transit times reduce absorption efficiency.
- Frequent or heavy alcohol consumption: Alcohol directly inhibits the intestinal transport of biotin and impairs liver metabolism.
- Pregnancy and lactation: Metabolic turnover of biotin accelerates during pregnancy and breastfeeding; research suggests a significant proportion of pregnant women develop marginal biotin depletion.
- Regular consumption of raw egg whites: Raw egg whites contain a glycoprotein called avidin, which binds dietary biotin with exceptional affinity, forming an unbreakable complex that prevents absorption. Cooking egg whites completely denatures avidin, eliminating this risk.
- Certain anti-epileptic medications: Long-term use of anticonvulsants (such as carbamazepine, phenytoin, or primidone) can accelerate biotin breakdown in the liver and compete with biotin for intestinal uptake.
Dietary Sources vs Supplements: Getting the Balance Right
For the vast majority of people, meeting daily biotin needs through a varied, nutrient-dense diet is the safest and most effective approach. Whole foods deliver biotin alongside complementary micronutrients, dietary fibres, and essential fatty acids that work synergistically to support the gut microbiome.
Recommended Intake
In the UK and Europe, the European Food Safety Authority (EFSA) and dietary guidelines suggest an Adequate Intake (AI) of 30 to 40 micrograms (mcg) per day for adults, with a slight increase to 35–40 mcg per day for lactating women.
Because biotin is widely distributed in nature, this modest daily target is readily achievable through balanced meals.
Top Nutritional Sources of Biotin
To support both your gut lining and your overall micronutrient profile, consider incorporating these natural sources:
- Eggs (cooked): One whole cooked egg provides approximately 10 mcg of biotin, concentrated primarily in the yolk.
- Salmon and oily fish: A standard 100g portion of cooked salmon provides around 5 mcg of biotin, alongside anti-inflammatory omega-3 fatty acids that soothe the intestinal lining.
- Beef liver and organ meats: Liver is the most concentrated natural source, providing over 30 mcg per 75g serving.
- Nuts and seeds: Almonds, walnuts, peanuts, and sunflower seeds offer a valuable plant-based source (around 1.5 to 2.5 mcg per small handful) while delivering prebiotic fibres that feed beneficial gut bacteria.
- Sweet potatoes: A half-cup of cooked sweet potato contains roughly 2.4 mcg of biotin, accompanied by soluble fibre and beta-carotene for mucosal repair.
- Spinach and leafy greens: Deliver modest amounts of biotin alongside folate and magnesium, both of which are critical for metabolic vitality.
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│ SAMPLE BIOTIN-RICH FOOD SOURCES │
├────────────────────────────┬─────────────────────────────────────┤
│ Food Source │ Approximate Biotin Content │
├────────────────────────────┼─────────────────────────────────────┤
│ Cooked Beef Liver (75g) │ ~30.0 mcg │
│ Whole Cooked Egg (1 large) │ ~10.0 mcg │
│ Cooked Salmon (100g) │ ~5.0 mcg │
│ Pork Chop (100g) │ ~3.8 mcg │
│ Sunflower Seeds (30g) │ ~2.6 mcg │
│ Sweet Potato (cooked, 100g)│ ~2.4 mcg │
│ Almonds (30g) │ ~1.5 mcg │
└────────────────────────────┴─────────────────────────────────────┘
The Truth About High-Dose Biotin Supplements
A quick look at high-street health shops reveals supplements offering 5,000 mcg, 10,000 mcg, or even higher doses per capsule—doses that exceed daily requirements by more than 15,000%.
While biotin has a high safety ceiling and excess amounts are readily excreted in urine, taking megadoses rarely provides extra benefits for gut health if your body is not deficient. In some sensitive individuals, extremely high doses of synthetic B vitamins can actually cause mild digestive upset, stomach cramps, or loose stools.
Before introducing high-strength supplements, it is far more prudent to address foundational digestion, dietary variety, and overall metabolic health.
For a wider discussion of supplements and digestive wellness, explore this guide to improving gut health with supplements.
Important Lab Warning: Biotin Interference with Blood Tests
If you are taking or considering a biotin supplement, there is a critical laboratory safety factor you must understand. High-dose biotin can dramatically distort the accuracy of routine pathology tests.
How Immunoassay Interference Works
Many modern laboratory tests rely on a biochemical detection system that uses biotin and a protein called streptavidin to measure hormone and protein levels in your blood.
When you have high concentrations of free biotin circulating in your bloodstream from a supplement, that excess biotin competes with the test reagents inside the lab analyser. Depending on whether the specific test is a competitive or sandwich immunoassay, this interference can cause results to read falsely high or falsely low.
┌──────────────────────────────────────────────────────────────────┐
│ BIOTIN INTERFERENCE AT A GLANCE │
├────────────────────────────┬─────────────────────────────────────┤
│ Blood Test Marker │ Potential Impact of High-Dose Biotin│
├────────────────────────────┼─────────────────────────────────────┤
│ TSH (Thyroid Stimulating) │ Falsely SUPPRESSED (reads too low) │
│ Free T4 & Free T3 │ Falsely ELEVATED (reads too high) │
│ Troponin (Heart marker) │ Falsely SUPPRESSED (reads too low) │
│ Ferritin │ Can be falsely skewed │
│ Vitamin D (25-OH) │ Can be falsely skewed │
│ Cortisol & Testosterone │ Can be falsely skewed │
└────────────────────────────┴─────────────────────────────────────┘
The Thyroid Misdiagnosis Trap
This interference is especially problematic for thyroid panels. High-dose biotin can simultaneously cause your Thyroid Stimulating Hormone (TSH) to appear abnormally low while making your Free T4 and Free T3 appear abnormally high.
To a doctor reviewing these numbers without knowing about supplement use, this pattern mimics severe hyperthyroidism or Graves' disease. This can lead to misdiagnoses, unnecessary clinical referrals, or inappropriate medication changes.
Crucial Safety Note: If you are undergoing any blood testing—including thyroid function tests, vitamin panels, or cardiovascular markers—always inform your GP and the laboratory if you take biotin. It is generally advised to discontinue high-dose biotin supplements for at least 48 to 72 hours (and up to a week for very high megadoses) prior to a blood draw to allow the vitamin to clear from your circulation.
For additional preparation guidance, read this professional guide to testing your thyroid at home.
The Blue Horizon Method: A Phased Approach to Gut and Metabolic Health
When you are dealing with unexplained bloating, digestive irregularities, fatigue, or changes in your hair and skin, it is natural to want immediate answers. However, jumping straight to high-dose supplements or treating individual symptoms in isolation often leads to confusion and frustration.
At Blue Horizon, we advocate a structured, doctor-led journey that focuses on seeing the whole picture.
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│ THE BLUE HORIZON METHOD │
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┌──────────────────┐ ┌──────────────────┐ ┌──────────────────┐
│ PHASE 1 │ │ PHASE 2 │ │ PHASE 3 │
│ GP Consultation │ ───► │ Structured Self-│ ───► │ Targeted Blood │
│ & Rule-Outs │ │ Tracking │ │ Testing │
└──────────────────┘ └──────────────────┘ └──────────────────┘
Phase 1: Consult Your GP First
Your first step should always be an open conversation with your NHS GP. Persistent digestive changes (such as sudden shifts in bowel habits, chronic bloating, unexplained weight loss, or difficulty swallowing) require professional evaluation.
Your GP can conduct initial clinical rule-outs for conditions such as coeliac disease, inflammatory bowel disease, anaemia, or infection. If you experience sudden or severe symptoms—such as intense abdominal pain, blood in your stool, high fever, or severe dehydration—you must seek urgent medical attention via your GP, NHS 111, or A&E.
Phase 2: Structured Self-Tracking
If initial medical investigations show no acute pathology, tracking your daily patterns provides invaluable clinical context. For two to three weeks, keep a simple diary noting:
- Symptom timing: When does bloating, sluggishness, or discomfort peak? Does it happen within 30 minutes of eating, or several hours later?
- Dietary variety: Are you getting adequate prebiotic fibres, cooked proteins, and colourful plant foods, or relying heavily on ultra-processed meals?
- Lifestyle factors: Note your sleep duration, daily stress levels, and hydration. High stress directly suppresses stomach acid and slows gut motility.
- Supplement intake: Log every vitamin, mineral, or herbal product you take, including exact doses.
Phase 3: Targeted Blood Testing for Objective Clarity
If you have addressed basic lifestyle factors and your GP's initial checks have ruled out acute disease, but you still feel unwell or fatigued, comprehensive pathology testing can provide the missing puzzle pieces.
Rather than guessing whether you need biotin, iron, or thyroid support, an objective blood profile helps you see how your internal systems are functioning together.
Comprehensive Thyroid and Metabolic Profiles
Because gut motility, energy production, and hair/skin vitality are deeply connected to thyroid and metabolic health, looking at a broader panel of biomarkers can be transformative. Blue Horizon offers a tiered range of thyroid blood tests designed to provide clear, actionable insights without diagnostic guesswork:
- Bronze: Covers the essential thyroid markers—TSH (Thyroid Stimulating Hormone), Free T4, and Free T3—along with our signature Blue Horizon Extras: Magnesium and Cortisol. Magnesium is an essential cofactor for muscle contraction and intestinal motility, while cortisol reflects the body's physiological stress response. You can explore the Thyroid Premium Bronze profile for these core markers.
- Silver: Includes everything in the Bronze tier, plus Thyroid Peroxidase Antibodies (TPOAb) and Thyroglobulin Antibodies (TgAb) to evaluate potential autoimmune activity affecting your metabolism. The Thyroid Premium Silver profile provides this antibody-focused option.
- Gold: Combines all Silver markers with essential nutritional and inflammatory indicators: Ferritin (stored iron), Folate, Active Vitamin B12, C-Reactive Protein (CRP), and Vitamin D (25-OH). This provides a comprehensive health snapshot, highlighting whether malabsorption might be affecting your wider nutrient status. The Thyroid Premium Gold profile includes these additional markers.
- Platinum: Our most comprehensive profile. Includes everything in Gold, plus Reverse T3, HbA1c (long-term blood sugar regulation), and a Full Iron Panel (Total Iron, Transferrin Saturation, TIBC, and UIBC). This is ideal for those seeking an in-depth metabolic and hormonal evaluation, with details available on the Thyroid Premium Platinum profile.
Practical Details for Testing
To ensure the highest standard of accuracy and convenience:
- Sample Collection: Bronze, Silver, and Gold profiles can be completed from home using a fingerprick (microtainer) sample or an advanced Tasso device, or via a clinic visit or professional nurse home visit. Because the Platinum panel requires a larger venous draw, it is completed via a clinic appointment or nurse home visit.
- Timing: We recommend collecting thyroid and hormone blood samples around 9:00 am, as hormone levels follow a natural diurnal rhythm that aligns best with reference ranges in the early morning.
- Reviewing Results: Your laboratory report provides clear, easy-to-read reference ranges designed to be shared directly with your GP or specialist to guide a productive, collaborative discussion.
You can learn how to arrange a blood test and explore the available thyroid testing options.
Summary and Practical Next Steps
Is biotin good for gut health? The answer is a clear yes—but with important clinical caveats.
Biotin is an indispensable nutrient that fuels the rapid renewal of your gut lining, supports the tight junctions of your mucosal barrier, regulates local inflammatory responses, and aids smooth digestive motility. Furthermore, a balanced, thriving gut microbiome actively produces biotin to support your daily metabolic needs.
However, biotin is not an overnight cure for chronic bloating, gut distress, or digestive disorders. Megadoses found in commercial beauty supplements are rarely necessary for digestive health and carry a substantial risk of interfering with vital blood tests—most notably thyroid and cardiac panels.
To take control of your digestive and metabolic vitality responsibly:
- Prioritise whole foods: Focus on cooked eggs, wild salmon, leafy greens, nuts, and sweet potatoes to obtain natural biotin alongside gut-friendly fibres.
- Consult your GP: Rule out underlying gastrointestinal or systemic conditions before starting any new supplement regime.
- Track your habits: Use a structured diary to identify lifestyle, stress, and dietary patterns influencing your digestion.
- Investigate objectively: If mystery symptoms persist, use comprehensive pathology testing—such as our tiered Thyroid Premium Gold or Thyroid Premium Platinum profiles—to look at your thyroid hormones, B vitamins, iron stores, and inflammation markers in one clear snapshot.
By looking at the complete picture rather than chasing isolated supplements, you can make informed, confident choices that support your long-term health.
FAQ
Does biotin help with gut inflammation?
Biotin plays a supportive role in regulating the immune system within the gut lining. Research shows that adequate cellular biotin levels help keep pro-inflammatory signalling molecules (such as IL-1β and TNF-α) in check, while supporting the fatty acid synthesis needed to maintain a strong mucosal barrier. However, biotin is not an anti-inflammatory medication or a cure for inflammatory bowel disease; any persistent gut inflammation must be formally evaluated by a GP or gastroenterologist.
Can taking biotin cause digestive side effects like bloating or diarrhoea?
When obtained through whole foods or standard nutritional multivitamins, biotin rarely causes side effects. However, very high-dose supplements (such as 5,000 mcg to 10,000 mcg formulations) can occasionally trigger mild gastrointestinal upset, stomach cramps, nausea, or loose stools in sensitive individuals. If you experience digestive discomfort after starting a high-dose supplement, it is advisable to stop taking it and consult your doctor.
How does the gut microbiome produce biotin naturally?
Certain beneficial bacteria residing in the large intestine—particularly species within the Bacteroides, Prevotella, and Bifidobacterium genera—possess the metabolic pathways required to synthesise vitamin B7. This bacterially generated biotin is absorbed across the colonic wall via human sodium-dependent multivitamin transporters (hSMVT), providing a continuous baseline supply to the body alongside dietary intake.
Should I stop taking biotin before having a blood test?
Yes. High levels of biotin in your bloodstream can significantly interfere with laboratory immunoassay equipment, leading to falsely high or falsely low results for thyroid hormones (TSH, Free T4, Free T3), cardiac troponin, ferritin, and vitamin D. You should inform your healthcare provider about any supplements you take and generally discontinue high-dose biotin supplements for at least 48 to 72 hours prior to your blood sample being drawn. You can also review the practical guidance in Blue Horizon’s frequently asked questions.
