Colostrum

Is colostrum safe?

For most adults who tolerate dairy, yes. Bovine colostrum is the thick first milk a cow makes in the days after calving, dried into a powder. It is a dairy food with no upper intake limit and no known toxic dose, and trials using 10 to 60 grams a day report few side effects beyond an upset stomach.

The catches are practical rather than toxic. It is cow's milk, so it is off-limits with a milk allergy. US recalls show that some sellers forget to say so on the label. And the health claims that drove the boom rest on small, mixed studies.

Why is everyone taking colostrum now?

Sales took off in 2024 and 2025, carried by social media and direct-to-consumer brands selling it as an all-in-one powder for immunity, gut health and skin. Retail tracker SPINS, cited by Nutritional Outlook in February 2026, recorded colostrum sales in US hair, skin and nails products up 2,454% in the year to November 2025, to just over $13 million, and immune products in natural stores up 203%.

Growth on that scale tends to bring new suppliers, new contract manufacturers and less experienced labelling. That is where the risks in the records show up.

What do the studies actually show?

Less than the marketing suggests. A 2022 review in Nutrients found nine studies on colostrum and gut permeability in athletes and called for better randomised trials. A 2025 systematic review of eight studies in children concluded that no conclusion could be drawn on gut health. A 2026 review of 13 trials on body fat and blood lipids found a few positive results but too much variation in doses (10 to 60 g a day) and designs to be sure of anything.

The evidence in premature babies, where colostrum has been studied most carefully, is a useful warning. A 2025 meta-analysis of four trials with 670 infants found no effect on necrotising enterocolitis and said colostrum cannot be recommended for preterm infants. A 2024 review stressed that products used for these babies must be free of Bacillus cereus, a bacterium that can be very dangerous for them.

None of this suggests harm in healthy adults. It does mean you are paying for a promise that has not been tested well.

Can colostrum cause an allergic reaction?

Yes, in people with cow's milk allergy. Colostrum carries casein and whey, the same proteins as ordinary milk, plus lactose. In the FDA's enforcement database we found 19 recall entries for products mentioning colostrum between 2015 and 2026. Most were for labels that listed "bovine colostrum" without the required "contains milk" warning, including children's chewable tablets from two brands in 2023 and a colostrum powder recalled in late 2025.

That gap matters most for parents of children with milk allergy, who may not realise that colostrum is milk.

How reliable are colostrum products?

Quality is the weakest part of the picture. Besides the allergen labels, FDA records show a 2019 recall of colostrum throat sprays contaminated with Stenotrophomonas maltophilia bacteria, a 2015 recall of colostrum tablets for manufacturing violations, and in 2026 a Class II recall of Imu-Tek Colostrum-5 capsules and powder that were "potentially under-processed". Colostrum is a raw animal product, so heat treatment and microbial testing are not optional extras.

Potency is a separate problem. The active ingredients that brands advertise, mainly immunoglobulin G (IgG), vary with the cow, the timing of collection and the processing. Many labels do not state the IgG content, and we found no large independent test of colostrum products comparable to those for collagen or protein powder.

Who should be careful

• People with cow's milk allergy: avoid colostrum entirely.
• People with lactose intolerance: expect possible bloating; start small.
• Premature or sick newborns: only within a hospital trial. Do not use consumer products.
• Pregnant or breastfeeding women and people with weakened immunity: there is little safety data, and a contaminated raw animal product carries more risk. Talk to your doctor or pharmacist first.
• Drug-tested athletes: colostrum contains IGF-1 and other growth factors; check with your anti-doping body and use a batch-tested product.

How to choose a colostrum product

1. Check the allergen line. It should say "contains milk". If it does not, the label does not meet US rules.
2. Look for a stated IgG percentage and a certificate of analysis that covers microbes and heavy metals.
3. Prefer pasteurised or low-heat-processed products from a named country and supplier, and check for a recall before buying a new brand.
4. Treat combination "superfood" blends with care. Added herbs and vitamins bring their own interactions, as with probiotics blends that add botanicals.

How we scored it

Organ toxicity (90) and interactions (90) are strong because colostrum is a dairy food with no credible injury reports or drug interactions. Dose safety (84) is held back by milk allergy and lactose. Product quality (62) is the weakest factor: allergen labelling failures, contamination and under-processing recalls, and labels that rarely state tested potency. The regulatory record (80) reflects those recalls, with no bans.