Colostrum supplements: hype vs evidence

By the DieticiansWorldwide.com editorial team · 17 October 2026 · Supplements & industry

What colostrum is, and what is in the tub

Colostrum is the first secretion from the mammary gland after birth. In people, the NHS describes it as the fluid the breasts produce in the first few days after birth, usually thick and golden yellow, and so concentrated that a newborn needs only about a teaspoonful at each feed (NHS, breastfeeding: the first few days).

The supplements on sale are made from bovine colostrum, collected from dairy cows in the first days after calving and then pasteurised, dried and sold as powder, capsules or chewables. A 2022 review in Nutrients describes bovine colostrum as a concentrated, low-volume source of nutrients and bioactive components, and notes that genetics, environment and processing all change what ends up in the final product (Mehra et al., 2022).

That last point matters more than most labels admit. "Colostrum" is not one standardised ingredient. Two products can differ in when the milk was collected, how it was heated and dried, and how much of the immune proteins survived. The trials discussed below used different products and doses, which is one reason their results do not line up neatly.

The ingredients most often cited on labels are immunoglobulins (antibodies), lactoferrin, growth factors, and the protein, fat and lactose you would expect in a dairy product.

Why colostrum became a social-media supplement

Colostrum has been sold to athletes for decades, but it moved into the mainstream through influencer marketing: a scoop stirred into coffee or a smoothie, with promises that range from "gut repair" and "immune support" to clearer skin, better hair and weight loss.

The pitch borrows credibility from a true fact. Colostrum genuinely matters for newborn mammals, and calves that do not receive enough of it are at real risk. It does not follow that an adult with a mature immune system and gut gains the same benefits from a powder made from another species' first milk. That is the gap the evidence has to fill, and for most claims it has not yet done so.

Colostrum for gut health: what the trials show

Gut health is the most heavily marketed claim and also one of the better studied.

Gut permeability ("leaky gut")

A 2024 meta-analysis in Digestive Diseases and Sciences pooled ten studies of bovine colostrum in healthy athletes and patients (Dig Dis Sci, 2024). It found a significant reduction in two urine sugar tests used as markers of intestinal permeability, the lactulose to rhamnose ratio and the lactulose to mannitol ratio. It found no difference in plasma I-FABP, a blood marker of gut cell damage. The authors concluded that more trials with different doses, durations and product quality are needed to confirm the result.

A separate 2022 systematic review focused on athletes, in whom hard exercise is known to increase gut permeability, and judged that colostrum may help but that well-designed, placebo-controlled trials are still needed to work out safety and dose (Dziewiecka et al., 2022).

Two cautions apply. A change in a permeability test is a laboratory marker, not proof that someone feels better or avoids disease. And increased permeability shows up in many different situations, from hard exercise to illness, so a powder that nudges a marker is not the same as treating a condition.

Digestive symptoms and disease

A 2024 systematic review in Systematic Reviews looked at 22 clinical trials with 1,427 patients and digestive conditions (Syst Rev, 2024). Diarrhoea was the symptom most often measured. Its frequency fell with colostrum in 15 of 20 treatment arms, and stool frequency fell in all seven studies that measured it, but most studies found no change in how long diarrhoea lasted. Abdominal pain improved in four arms and not in five others. The authors' verdict: limited evidence, mixed findings, more well-designed trials needed.

In children, a 2025 review in the Journal of Pediatric Gastroenterology and Nutrition found the studies too varied in dose, form and outcome to pool, and concluded that no conclusion can be drawn about the clinical benefit of bovine colostrum for children's gut health (JPGN, 2025).

For gut symptoms, colostrum is not a first-line choice. Fibre, fermented foods and a diet review have stronger evidence for most people; our guide to high-fibre foods is a better starting point.

Colostrum for immunity: the strongest signal, in a narrow group

The most persuasive data come from people in hard training, who tend to report more upper respiratory symptoms during heavy blocks.

A 2016 systematic review and meta-analysis in BMC Sports Science, Medicine and Rehabilitation found five randomised trials, with 152 participants, all of them adults doing regular exercise training (Jones et al., 2016). Over 8 to 12 weeks, bovine colostrum reduced the rate of days with upper respiratory symptoms by 44% and the rate of episodes by 38% compared with placebo. The authors judged four of the five studies to be at moderate or high risk of bias, mainly because of poor reporting, and said the result needs confirming in a properly powered trial.

A 2020 meta-analysis in Nutrients then asked whether colostrum actually changes immune markers. Across 10 trials with 239 athletes and active adults, it found no or only a fairly low effect on blood immunoglobulins, lymphocytes, neutrophils and salivary IgA (Główka et al., 2020). The authors noted that the mechanism behind the reported drop in respiratory infections remains unclear.

So the immunity claim, at its best, reads like this: in small trials of people in heavy training, colostrum was linked to fewer days with cold-like symptoms, but nobody has shown how, and the studies are small and imperfect. There is little direct evidence in people who are not training hard.

If immunity is your goal, the basics have better support: sleep, vaccination, enough protein and energy, and correcting real deficiencies. Our guides to vitamin D supplements and zinc supplements explain where those two nutrients do and do not help.

Recovery, body composition and other claims

Colostrum is also sold for muscle recovery, performance, weight loss, skin and hair.

• Body fat and blood lipids. A 2026 systematic review in Nutrients found 13 clinical trials (Goluch et al., 2026). A few showed small changes: one study in older adults found body fat fell by 0.4% with 60 g a day for 8 weeks, and two studies reported lower cholesterol or triglycerides. Because of large differences between studies and inconsistent findings, the authors called for longer, larger, double-blind trials, ideally of at least six months.
• Performance and recovery. We did not find a pooled analysis showing a clear, consistent performance or recovery benefit. Trials exist, but they use different products, doses and outcomes.
• Skin, hair, "hormone balance" and longevity. We found no meaningful human trial evidence for these claims in the sources we reviewed.

What does colostrum do for women specifically?

Searches for "colostrum for females" usually lead to marketing about skin, hair, hormones and bloating. We found no trials designed to test benefits specific to women. The trial evidence above applies to adults generally, and most of it comes from athletes.

What is specific to women is the human colostrum produced in late pregnancy and after birth, which is covered below. If you are pregnant or breastfeeding, ask your midwife or a dietitian before adding any supplement. Bovine colostrum is a dairy product and adds calories and protein, but it is not a pregnancy supplement and has no established role in pregnancy.

How bovine colostrum compares with milk and other proteins

The trial doses come from the 2026 Nutrients review, which included studies at 10 g, 30 g and 60 g a day and suggested future trials standardise at 20 to 25 g a day. Many retail products recommend smaller scoops than the trials used, so a label claim built on a 20 g a day study may not apply to a 2 g serving.

Can I feed my baby pumped colostrum?

Yes, and this is very different from buying a bovine supplement. Many NHS maternity services support antenatal colostrum harvesting: hand expressing and storing your own colostrum in late pregnancy so it is ready if your baby needs extra milk after birth.

King's College Hospital's 2025 leaflet, for example, describes colostrum as the first milk, usually produced from about 16 weeks of pregnancy, containing antibodies and hormones that help protect the baby and support gut development (King's College Hospital NHS Foundation Trust). It recommends starting from 36 weeks, with different timings for twin pregnancies and type 1 diabetes, and lists situations where it can help, such as diabetes in pregnancy, a planned caesarean or a baby expected to need neonatal care.

The same leaflet says not to express before birth if you have a history of threatened or actual premature labour, a cervical stitch, certain placental conditions, or take a medicine that could harm the baby through breast milk. Hand expression is used rather than a pump, and the colostrum is stored in sterile syringes in the fridge or freezer following your hospital's guidance.

Do not give a baby a bovine colostrum supplement unless a doctor has advised it. A 2018 meta-analysis in Pediatrics found that human or bovine colostrum given to preterm infants in trials did not reduce severe necrotising enterocolitis, death or sepsis, although it shortened the time to full feeds (Sadeghirad et al., 2018). That research was done in neonatal units under medical supervision, not with retail products.

Safety, side effects and who should avoid it

Reviews generally describe bovine colostrum as well tolerated in the trials, and the 2022 Nutrients review called it safe for human ingestion in clinical studies. The practical risks come from what it is: a concentrated dairy product.

Avoid it, or check with a professional first, if you:

• have a cow's milk protein allergy. Colostrum is cow's milk.
• are lactose intolerant. Many products contain lactose; small servings may be tolerated, larger trial doses may not.
• are pregnant or breastfeeding, because there is no established benefit and products vary.
• have kidney disease or a protein restriction, because high doses add protein.
• are buying for a child. Paediatric evidence is inconclusive.

Side effects reported with dairy-based powders are usually digestive: bloating, gas or loose stools, especially at larger doses.

Choosing a product: brands, sourcing and testing

People often ask which brand is "better", for example ARMRA or Cowboy Colostrum. We do not endorse brands, and we found no head-to-head trials comparing retail colostrum brands. Claims of superiority are marketing, not evidence.

What you can compare is information on the label and the company's documentation:

1. Dose. How many grams of colostrum per serving, and how does that compare with the 10 to 60 g a day used in trials?
2. Immunoglobulin content. Some products state IgG per serving. Without it, you cannot compare potency.
3. Collection and processing. How soon after calving was the milk collected, and was it processed at low temperatures?
4. Independent testing. In the US, the FDA does not approve supplements for safety or effectiveness before sale, and companies are responsible for their own safety standards (FDA 101: Dietary Supplements). Our United States country guide covers how that system affects practitioners and consumers.
5. Other ingredients. Flavoured powders may add sugar, sweeteners or extra supplements.

Price per gram of colostrum, rather than price per tub, is the fairest comparison. For more on how supplement products are regulated and sold, see our supplements hub.

Is it worth trying? A practical verdict

Here is a balanced reading of the evidence as of October 2026:

• Possibly worth trying: adults in heavy endurance or team-sport training who want to test whether it reduces their cold-like symptoms, using a trial-like dose for 8 to 12 weeks and tracking the result honestly.
• Uncertain: gut permeability and some digestive symptoms, where results are promising but inconsistent.
• Not supported: skin, hair, hormone, weight-loss and longevity claims; routine use in children; use in pregnancy.

If you decide to try it, set a goal, a dose, a time limit and a way to judge it. Check your overall diet first with our free healthy eating check. Other heavily marketed products deserve the same scrutiny, including electrolyte drinks and berberine.

A registered dietitian can look at your symptoms, training and diet and help you decide whether colostrum is worth the money or whether something else would do more. You can book a session online.

Book a session with a dietitian