Bovine colostrum is the first milk a cow produces after calving, and in adults the most consistent research points to three areas: gut lining support, fewer upper respiratory illnesses in athletes, and recovery after hard training. Studies use very different amounts than most labels suggest, so how you choose a product and a serving matters as much as the ingredient itself. Below you get what colostrum contains, what the human trials found, how powder and capsules differ, and who should skip it.
Key Takeaways
- Bovine colostrum is rich in immunoglobulins, lactoferrin and growth factors, and a 2021 systematic review of 28 studies found interesting effects on upper respiratory illness in athletes and on intestinal permeability.
- Gut health is the best-studied area: trials report fewer episodes of diarrhea, and small colitis trials used colostrum alongside standard treatment.
- Studies in athletes typically use 10 to 20 g a day, while commercial labels often suggest 500 mg to 1 g, so compare serving sizes before you compare products.
- Powder lets you reach gram-level amounts; capsules suit convenience and low servings.
- Anyone with a cow’s milk allergy, and anyone pregnant or breastfeeding, should not take it.
Table of Contents
- What bovine colostrum is and what is in it
- Gut health: the most studied benefit
- Immunity and fewer respiratory infections
- Exercise recovery and performance
- Skin, hair and weight loss
- Colostrum dosage: what studies used
- Colostrum powder vs capsules
- Who should avoid colostrum, and side effects
- How to choose a colostrum supplement
- Our perspective
- Where to find it
- FAQ
- Sources
What bovine colostrum is and what is in it
Colostrum is the thick, golden first milk. Supplements use the bovine kind, collected from cows in the first days after calving and then dried into powder, capsules or chewables.
It differs from regular milk in what it concentrates. A 2021 review in PMC describes it as richer than mature milk in fat, protein, peptides, vitamins, minerals, hormones, growth factors, cytokines and nucleotides. IgG makes up 85 to 90% of its immunoglobulins, and lactoferrin is present at about 0.80 mg/mL.
Those names matter because each one maps to a reason people take it:
- Immunoglobulins (IgG, IgA, IgM): antibodies, the immune proteins that bind to pathogens.
- Lactoferrin: an iron-binding protein tied to gut and immune function.
- Growth factors (insulin-like, TGF-β and others): signaling proteins involved in tissue repair.
- Cytokines and oligosaccharides: messenger molecules and prebiotic-type carbohydrates.
The Drugs.com monograph lists all of these, along with lactoperoxidase, lysozyme, caseins, vitamins and minerals.
Gut health: the most studied benefit
If you read one section, read this one. The gut is where colostrum research is deepest, and it is why most people first look for it.
Intestinal permeability and inflammation
The gut lining is a selective barrier. When it becomes more permeable, which people call “leaky gut,” more material crosses than should. The Guberti review of 28 studies found that bovine colostrum reduced intestinal permeability in both healthy and sick subjects and modulated immune response. Its authors also noted the absence of adverse effects.
Cleveland Clinic says human and non-human studies show colostrum may reduce inflammation and gut permeability, with potential for people with GI issues such as Crohn’s disease and IBD. A 2022 review noted by Bon Appétit suggests effects on leaky gut in athletes at up to 20 g a day.
Diarrhea
SELF reports that across 20 studies on GI issues, 15 found bovine colostrum decreased how often diarrhea occurred. That is a practical result for endurance athletes, who often deal with training-related gut upset.
Ulcerative colitis and IBD
Ulcerative colitis is an inflammatory bowel condition affecting the colon lining. In a randomized, double-blind trial, 14 patients with mild-to-moderate distal colitis received colostrum enemas (100 mL of a 10% solution) or placebo twice daily for 4 weeks, on top of mesalazine. The colostrum group’s symptom score fell by 2.9 on average versus a rise of 0.5 for placebo, and 5 of 8 colostrum patients showed histological improvement.
A 2021 review by Chandwe and Kelly points to TGF-β, a major colostrum growth factor, as a possible adjunct benefit in IBD. This trial used enemas, not oral capsules, and was an add-on to prescribed medication. If you have a diagnosed bowel condition, take colostrum only with your gastroenterologist’s agreement and never in place of your prescribed treatment.
For a deeper look at the digestive side, see our guide to colostrum for gut health and our colostrum articles.
Immunity and fewer respiratory infections
Immunity is the benefit colostrum is best known for, and the athlete data is the most interesting part. The Guberti review found bovine colostrum showed interesting effects in preventing upper respiratory illness in sportsmen. Cleveland Clinic cites a meta-analysis of seven trials with some evidence that colostrum may reduce upper respiratory tract infections.
Why this matters if you train: heavy training blocks and competition periods are when many athletes catch colds, and missed sessions cost progress. Researchers writing in a 2020 PMC meta-analysis say the protective effect may work through mechanisms that are still unknown, and call for more specific biomarkers. In practice, that means the observed outcome, fewer infections, is the part to focus on.
If immunity is your main goal, colostrum sits alongside basics such as sleep, protein and micronutrients. Our Immunity and Vitamins & Minerals categories cover those.
Exercise recovery and performance
Colostrum appeals to athletes for a second reason: its growth factors and anti-inflammatory properties. Cleveland Clinic notes some studies suggest improved breathing after exercise, likely because of those anti-inflammatory properties. A 2023 Nutrients study of soccer players, described by SELF, found decreased inflammatory markers after exercise.
The realistic expectation is better recovery and a steadier gut under training load, not a direct jump in strength or lean mass. Treat colostrum as one part of a recovery routine. Sleep, protein, hydration and planned rest days do the heavy lifting, and options such as compression therapy uses backed by evidence can sit beside them. For the full picture, read our muscle recovery supplement guide and the athletic performance supplement guide.
Skin, hair and weight loss
These are common search questions, so a direct answer helps. Cleveland Clinic states there are no studies supporting claims that colostrum improves skin, hair or nails or prevents skin aging. Nor is there research showing it causes weight loss. If weight management is your goal, the relevant link is indirect: a calmer gut and better recovery can help you stay consistent with training and nutrition.
Colostrum dosage: what studies used
There is no official standard dose, which is why it helps to know both ranges.
| Source of the number | Typical amount | What it means |
|---|---|---|
| Commercial labels, per a 2021 Playford review | 500 mg to 1 g a day | Common label range for healthy adults |
| Athlete and NSAID gut-injury studies, same review | 10 to 20 g a day | Where much of the gut and recovery research sits |
| Broader study range, per Mayo Clinic Press | 10 to 60 g a day, split into at least two doses, for 4 to 12 weeks | Trial protocols, typically short-term |
The lesson: check grams per serving, not just the front-of-pack claim. A small serving of a colostrum blend is a fraction of the amounts used in trials. SELF quotes a Columbia University gastroenterologist noting that a two-gummy serving with 215 mg of a colostrum-plus-prebiotic complex is a fraction of what a newborn would consume.
The Playford review notes there is virtually no high-quality dose-response data. So start at the label’s serving, split larger amounts across the day as the trials did, and run it for several weeks before judging.
Colostrum powder vs capsules
The choice comes down to dose and convenience.
- Powder: Reaching the 10 to 20 g range used in athlete studies takes several scoops, so powder is the practical route to those amounts. It mixes into a smoothie or cool drink and lets you adjust the serving gradually.
- Capsules: Each capsule is pre-measured, which suits travel and low servings, though reaching gram-level amounts means taking many capsules.
If your goal is gut support or training recovery at the amounts studied, powder gives you more flexibility. If you want a simple daily habit at a low serving, capsules fit. Either way, read the serving size and the amount of colostrum per serving, and look for products from our Gut Health category, where each product page lists what is in it. Our bovine colostrum protein supplement article explains how it relates to a protein routine.
Who should avoid colostrum, and side effects
This part is non-negotiable, and it is short.
- Cow’s milk allergy: Bovine colostrum comes from milk. Cedars-Sinai advises that anyone with a cow’s milk allergy should avoid it.
- Milk protein intolerance: Mayo Clinic Press notes that colostrum contains lactose and casein, so it is not recommended for people with milk protein allergies or intolerances.
- Pregnancy and breastfeeding: Both Mayo Clinic Press and Cedars-Sinai advise against use, since effects on a fetus are unknown.
- Weakened immune system: National Geographic quotes experts advising that immunocompromised people shouldn’t take it because safety evidence is insufficient.
- Common side effects: Reported effects include nausea, gas and bloating. Starting with a small serving and building up is a sensible way to use it.
Supplements are not FDA-approved before they are sold, so read the label for ingredients such as soy additives and talk to your doctor if you take medication or have a medical condition.
How to choose a colostrum supplement
- Read the grams per serving. Match it to the range you are aiming for.
- Pick the format to fit the dose. Powder for larger amounts, capsules for convenience.
- Check the ingredient list for milk allergens and additives that apply to you.
- Match it to your goal. Gut and immune support are the best-supported uses; recovery is promising.
- Give it time. Studies run 4 to 12 weeks, so judge it over weeks, not days.
Our perspective
We think colostrum earns a place in a gut and recovery routine for the right person, and the right person is an adult who trains, wants a steadier gut, and is not allergic to dairy.
The research gives that person reasons to be interested: reduced intestinal permeability, fewer respiratory illnesses in athletes, and an anti-inflammatory profile after exercise. What decides the outcome is the product and the amount. That is why we publish guides that explain servings and ingredients alongside the products themselves, so you can decide for yourself.
Our approach is to pair retail with education: in-house testing, a scientific basis for formulations, qualified professionals engaged directly, and transparent pricing are what we hold ourselves to. Colostrum works best as one piece of a whole: protein, sleep, fiber, and a gut-friendly routine.
Rene Harwood
Where to find it
If you are ready to add colostrum to your gut or recovery routine, browse our Gut Health and Strength & Fitness categories, where you can compare products by what is in each serving. Each category sits alongside supporting guides, such as our glutamine and gut health guide for athletes.
If you are building a broader plan, our sports-specific supplement protocol shows how supplements fit different training goals.
FAQ
Are colostrum supplements effective?
The best-supported effects are on gut permeability and on upper respiratory illness in athletes, according to a 2021 systematic review of 28 studies. Results vary with the dose and the group studied. Give any product several weeks, as trials ran 4 to 12 weeks.
Can bovine colostrum help with ulcerative colitis?
A small randomized trial of 14 patients found improved symptom scores when colostrum enemas were added to mesalazine. That was an add-on to medication, given rectally. If you have ulcerative colitis, speak to your gastroenterologist before taking any colostrum product.
How much colostrum should I take?
There is no official standard. Commercial labels suggest 500 mg to 1 g a day, while athlete studies mostly used 10 to 20 g a day. Start with the label serving and split larger amounts across the day.
Is colostrum good for weight loss?
No study shows colostrum causes weight loss. Its value for weight management is indirect: supporting gut comfort and recovery so you can keep training and eating consistently.
Sources
- Bovine Colostrum and Its Potential for Human Health (PMC, 2021)
- Bovine Colostrum Uses, Benefits and Dosage (Drugs.com)
- Bovine Colostrum Applications in Sick and Healthy People (PMC, 2021)
- Bovine Colostrum: Benefits and Side Effects (Cleveland Clinic)
- What Is Bovine Colostrum (Bon Appétit)
- What Is Colostrum (SELF)
- Colostrum enemas in distal colitis (Alimentary Pharmacology & Therapeutics, 2002)
- Colostrum Therapy for Human Gastrointestinal Health (PMC, 2021)
- Immunological Outcomes of Bovine Colostrum Supplementation (PMC, 2020)
- The Use of Bovine Colostrum in Medical Practice (PMC, 2021)
- Colostrum: Super supplement or overhyped? (Mayo Clinic Press)
- Are Colostrum Supplements Liquid Gold for Adults? (Cedars-Sinai)
- What the science says about colostrum supplements (National Geographic)
