Colostrum Supplements: Evidence, IgG and How to Choose

Disclaimer: This article is for information only and is not medical advice. Colostrum supplements are not approved to treat or prevent any disease. Don't take colostrum if you have a cow's-milk allergy, and talk to your doctor if you're pregnant, breastfeeding, have a hormone-sensitive condition, or take immune-suppressing medication. BiohackList does not accept paid or sponsored placements. We may earn commissions from qualifying purchases in the future.

A colostrum supplement is dried first milk from cows, sold for its antibodies, mainly IgG. Small trials suggest fewer colds in people who train hard. Evidence for gut, skin, hair or general immunity in healthy adults is thin. Quality varies a lot: in October 2026 tests of seven popular products, IgG ranged from 1.3% to 35.4%, and the cost of 200 mg of IgG ran from 27 cents to nearly $7.

In 30 seconds

• Colostrum supplements are dried first milk from cows, valued for antibodies (IgG).
• Small trials suggest fewer colds and upper respiratory symptoms in people training hard. Evidence for gut, skin or "immunity" in healthy adults is thin.
• Quality varies: ConsumerLab found 2 of 7 popular products fell short on IgG, one at just 1.3%.
• Compare products on cost per 200 mg of IgG, not price per tub.
• Skip it if you have a dairy allergy.

No listing on this page is paid or sponsored.

What is bovine colostrum?

Colostrum is the milk a cow produces in the first several days after giving birth. MSKCC describes it as rich in antibodies, growth factors and cytokines that protect the newborn calf. Mayo Clinic Press notes its antibodies include IgG and IgA, and that it contains lactoferrin and growth factors such as IGF-1.

How supplements are made. Colostrum is collected, dried and sold as a powder, capsules, stick packs or ready-to-drink products. The US dairy industry body ADPI defines whole colostrum powder as dried colostrum from cows within 48 hours after giving birth, with at least 17.5% fat.

"First milking" claims. Some brands say they use only the first milking or that calves are fed first. A collection claim on the label isn't a measurement. The number that tells you how much antibody you get is IgG, stated as a percentage or in milligrams per serving.

Serving size vs trial doses. Where stated, a serving of the products we checked is 3 g or less, while trials used 10 to 60 g a day, according to Mayo Clinic Press. Armra suggests 4 or more servings a day; at $119.99 for 120 servings, that is about $4 a day as of October 2026.

Colostrum benefits: what the trials show (grade C)

Our verdict: grade C overall. For people who train hard, two meta-analyses of small trials point the same way: fewer self-reported colds. The individual trials were small, often poorly reported, and relied on symptom diaries. Gut-permeability results come from two small, short crossover trials in exercising adults that measured a lab marker, not symptoms.

What the evidence does not show:

• That colostrum "boosts immunity" in healthy adults who don't train hard. The cold findings come from exercising adults, and Mayo Clinic Press notes the research mostly supports this only in athletes.
• That it "heals leaky gut." The gut trials measured short-term permeability after exercise, not a disease outcome.
• That it improves skin, hair or weight. We found no peer-reviewed RCT supporting these marketing claims.
• That small daily servings work. Mayo Clinic Press says studies typically used 10 to 60 grams a day, divided into at least two doses, for 4 to 12 weeks, and that very little research has looked at low doses.

Why IgG content varies so much

IgG is the main antibody in colostrum, and it is the number brands, standards and testers focus on. Several factors change how much ends up in your scoop:

• Timing of collection. ADPI's standard covers colostrum collected within 48 hours of calving. Brands rarely say when their colostrum was collected.
• Processing. Several brands warn that heat can degrade immunoglobulins and advise against mixing colostrum into hot drinks.
• Dilution. Flavors, sweeteners and added ingredients reduce the share of colostrum in each scoop.
• Blends and capsules. A product can contain real colostrum but so little of it per serving that the IgG dose is tiny.

The October 2026 tests. ConsumerLab bought seven popular colostrum supplements on the open market and measured IgG with AOAC method 2010.01. Its public summary reports:

• Two of seven fell short on IgG: only five of seven contained the amounts of IgG claimed or expected in high-quality colostrum.
• One contained just 1.3% IgG, less than 10% of the amount claimed. Others provided 13% to 35.4%.
• The release doesn't say how the second product fell short.
• The cost of 200 mg of IgG ranged from 27 cents to nearly $7, a spread of about 2,500%.

ConsumerLab's product-by-product results and its top pick are for members only, so we don't report which products passed or failed.

How to choose the best colostrum supplement (checklist)

1. A stated IgG number. Look for IgG as a percentage of the colostrum or in mg per serving. ADPI's standard for whole colostrum powder is 12.5% to 25% IgG, and ConsumerLab requires at least 12.5% to pass.
2. A named test method. AOAC 2010.01 is the method ConsumerLab used. A published certificate of analysis or a third-party test is better than a claim.
3. A heavy-metal screen. ConsumerLab tests for lead, cadmium, arsenic and mercury. For a product with a serving of 5 grams or more, its lead limit is 2.5 mcg per serving and 4.0 mcg per day.
4. Cost per 200 mg of IgG. See the method below.
5. A realistic dose. Compare the serving with the 10 to 60 g a day used in trials. Where stated, the products we checked serve about 3 grams or less.
6. Red flags. "Heals leaky gut," "boosts immunity," "anti-aging," no IgG number, or a proprietary blend that hides how much colostrum you get.

Cost per 200 mg IgG: how to calculate it

You need three numbers from the label and the price: price per serving, grams of colostrum per serving, and IgG percentage.

Formula: cost per 200 mg IgG = price per serving ÷ (mg of IgG per serving ÷ 200)

Worked example (illustrative numbers, not a real product):

• A tub costs $60 and has 30 servings, so each serving costs $2.00.
• Each serving is 3 g (3,000 mg) of colostrum at 20% IgG, so it contains 600 mg of IgG.
• 600 ÷ 200 = 3. So $2.00 ÷ 3 = about $0.67 per 200 mg of IgG.

Change one number and the result shifts a lot. At 10% IgG, the same tub costs $1.33 per 200 mg. If the label states no IgG figure, you can't do this math, and that's useful information too.

Colostrum side effects and who should avoid it

• Dairy allergy. MSKCC lists allergy to dairy products as a contraindication and reports a case of anaphylaxis in a teenager with cow's milk allergy after a colostrum cream was applied to a wound.
• Lactose and casein. Mayo Clinic Press says colostrum contains lactose and casein and is not recommended for people with milk protein allergies or intolerances.
• Pregnancy and breastfeeding. Mayo Clinic Press says it is not recommended for people who are pregnant or breastfeeding.
• Hormone-sensitive cancer. Colostrum contains trace amounts of naturally occurring estrogen. MSKCC says people with hormone-sensitive cancers should discuss it with their doctors before use.
• Medication and medical conditions. If you take immune-suppressing medicine or have a chronic condition, ask your doctor first.
• Side effects in general. Mayo Clinic Press says potential benefits seem to come with few physical adverse effects in studies.

Products on the market (label specs, not rankings)

Five of the seven products ConsumerLab tested, with details from each brand's official store, checked October 30, 2026. This is not a ranking and does not reflect ConsumerLab's results. None of the product pages we read stated an IgG percentage or mg per serving in readable page text. Check the label image or ask the brand for a certificate of analysis.

ConsumerLab also tested California Gold Nutrition Colostrum and Zena Nutrition Pure Colostrum 2,000 mg. We left them out of the table because we couldn't confirm the tested product and price on an official brand page.

What the table shows. Price per serving ranges from about $1 to $2.33, but without an IgG figure you can't tell which gives you more antibody per dollar. That helps explain why the ConsumerLab spread was so wide.

For other supplement evidence checks, see nattokinase, liposomal glutathione and astaxanthin, or our best biohacking products guide.

FAQ

What is colostrum?

Colostrum is the first milk a cow makes after giving birth. It is rich in antibodies (immunoglobulins, mainly IgG), lactoferrin and growth factors. Colostrum supplements are dried bovine colostrum sold as powders or capsules.

What are the benefits of colostrum supplements?

The best evidence is for fewer self-reported colds and upper respiratory symptoms in people who train hard, from small trials. Evidence for gut, skin, hair or general immunity in healthy adults is small or missing.

What is the downside of taking colostrum?

Cost and uneven quality. In October 2026 tests, 2 of 7 popular products fell short on IgG. It is also a dairy product that contains lactose and casein.

Who should not take colostrum?

Anyone with a cow's milk or dairy allergy. Mayo Clinic Press says it is not recommended in pregnancy or breastfeeding, and MSKCC says people with hormone-sensitive cancers should talk to their doctor first because it contains trace estrogen.

What happens if I take colostrum every day?

Trials typically gave 10 to 60 grams a day for 4 to 12 weeks, according to Mayo Clinic Press, and reported few side effects. Long-term data are lacking, and most retail servings are far smaller than trial doses.

How much IgG should colostrum have?

The dairy industry standard for whole colostrum powder (ADPI) is 12.5% to 25% IgG, and ConsumerLab requires at least 12.5% to pass. Look for a label that states IgG as a percentage or in milligrams.

Is colostrum OK with lactose intolerance?

Be cautious. Colostrum contains lactose, and Mayo Clinic Press advises against it for people with milk protein allergies or intolerances. Labels rarely state how much lactose a serving has.

How do I compare colostrum supplements?

Work out cost per 200 mg of IgG: divide the price per serving by the milligrams of IgG per serving, then multiply by 200. Prefer labels that name the IgG test method, such as AOAC 2010.01.

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Disclaimer: This article is for information only and is not medical advice. Colostrum supplements are not approved to treat or prevent any disease. Don't take colostrum if you have a cow's-milk allergy, and talk to your doctor if you're pregnant, breastfeeding, have a hormone-sensitive condition, or take immune-suppressing medication. BiohackList does not accept paid or sponsored placements. We may earn commissions from qualifying purchases in the future.

Affiliate note: There are no affiliate links on this page at launch. No listing is paid or sponsored. See our disclosure.

How we researched this: We read the studies below on PubMed, Europe PMC and the publisher's site, ConsumerLab's public press release and methods page, the ADPI standard, the MSKCC and Mayo Clinic Press explainers, and each brand's official product page. We didn't test these products.

Last checked: Oct 30, 2026.

Sources

• Jones AW et al. Bovine colostrum and upper respiratory symptoms during exercise training, meta-analysis, BMC Sports Sci Med Rehabil 2016;8:21 (PMID 27462401)
• Hałasa M et al. Bovine colostrum and upper respiratory tract infections, meta-analysis, J Funct Foods 2022;99:105316
• Marchbank T et al. Bovine colostrum and exercise-induced gut permeability, Am J Physiol Gastrointest Liver Physiol 2011;300(3):G477-84 (PMID 21148400)
• March DS et al. Intestinal fatty acid-binding protein and gut permeability responses to exercise, Eur J Appl Physiol 2017;117(5):931-941 (PMID 28290057)
• ConsumerLab. 2 of 7 colostrum supplements fall short on IgG (press release, Oct 28, 2026)
• ConsumerLab. How products were evaluated, colostrum
• ADPI. Whole Colostrum Powder Standard, v3.0 (effective Oct 2, 2026)
• Memorial Sloan Kettering Cancer Center. Bovine colostrum (last updated Dec 8, 2021; accessed Oct 30, 2026)
• Mayo Clinic Press. Colostrum: super supplement or overhyped? (published Oct 7, 2024; accessed Oct 30, 2026)
• Armra Colostrum Unflavored Jar
• Cowboy Colostrum Unflavored
• Sovereign Laboratories Colostrum-LD powder
• WonderCow Colostrum Powder
• Adapt Naturals Bio-Avail Colostrum+