TARE no longer sells a colostrum product.
We audited our supplier and two products did not survive it. First Food, the colostrum, was one of them. The reason is a single sentence: no lot from either supplier carries a finished-product immunoglobulin assay. Not a low result and not a failed one — the test is not run and the row does not exist. The compound the product was bought for could not be measured on any document available to us, so it left the range in August 2026 rather than stay on a shelf behind a number nobody could check.
The article stays up, and every figure that described our own jar has come out of it: the serving weight, the lot code, the certificate rows and the link to the product page. What is left is the part that was never about us — how the ingredient behaves, how the label works, and what to ask of anyone still selling one. The full account of what we retired, and why, is on Testing & Certification.
Most articles about supplement side effects are written to make them disappear. This one is written to say what is commonly reported, what the usual explanation for it gets wrong, and what to do about it in the first week.
The honest headline first: the reported side-effect profile for bovine colostrum in healthy adults is unremarkable, and almost all of it is digestive and short-lived. That is not the same as nothing, and it is not the same as a mystery.
Does colostrum cause side effects?
Mostly mild digestive ones, mostly in the first week, mostly at the point where a full serving is started cold. Bloating, gas and loose stools are the ones that come up. They tend to settle without intervention, and the two changes that prevent most of them are starting at half a serving and taking it with food.
The hard exception is not a side effect at all and it is not negotiable. Colostrum is a dairy product and it contains milk. A milk allergy is a stop, not a dose adjustment. More on that below, and it is the reason an allergen line belongs at the top of a colostrum FAQ rather than in the fine print.
Why does colostrum cause bloating or gas in the first week?
Three ordinary explanations cover most of it. It is a dairy protein, arriving in a routine that did not previously contain one. It carries trace lactose. And a full serving taken on an empty stomach on day one is a larger single introduction than most people would choose deliberately. None of that is exotic.
Now the explanation we are not going to hand over. A popular version of this story attributes first-week bloating to a "die-off" reaction — harmful bacteria being killed and releasing something as they go. That mechanism is not established, and it has a specific commercial appeal: it reframes a side effect as evidence the product is working. Any explanation that makes discomfort into proof should be examined carefully, and this one does not survive the examination. The boring reasons above account for what is actually reported.
How long does the adjustment period last?
Where it happens at all, it is commonly described as settling inside the first week or two. That is a pattern reported by users rather than a figure established by a trial, and worth labelling as such. If it has not settled after two weeks at a reduced serving, that is information rather than a failure of persistence.
What to do with that information is simple and it is the part usually left out: stop. A supplement that is still causing trouble after a fortnight at half a dose is not the right one, and no brand is entitled to talk anyone past that. Which is worth knowing before the first jar rather than after the second week: a returns policy that takes an opened tub back is the one that lets a reader act on this paragraph, and it is a short thing to check.
How to start so most of it never happens
- Start at half a serving for the first week. This single change accounts for most of the difference between a smooth start and an uncomfortable one.
- Take it with food. Not because there is an absorption case, but because there is a tolerance one.
- Build to a full serving in week two, and only if week one was uneventful.
- Change one thing at a time. Starting colostrum in the same week as a new protein, a new pre-workout and a new training block makes the result uninterpretable.
- Give it thirty days before judging it. There is no jolt here and nothing to feel in the first hour, which is worth knowing in advance rather than discovering with disappointment.
Who should not take colostrum at all?
Anyone with a milk allergy, without exception. Colostrum is naturally lower in lactose than ordinary milk but it is not lactose-free, so significant lactose intolerance is a reason for caution and a half serving at most. Pregnancy, nursing, any medical condition, or any prescription medication means asking a doctor first.
One more, for anyone competing under a testing body. Bovine colostrum naturally contains growth factors, including insulin-like growth factor. Anti-doping guidance in this area is specific to the sport and it changes. Check the relevant federation's current position rather than taking a supplement brand's word for it, ours included.
What the research does not show
It does not give a rate. There is no reliable figure for how often first-week digestive complaints occur, because the trials that exist were not designed to produce one and the rest is user report. Anyone quoting a percentage has manufactured it.
It does not establish a mechanism for the adjustment period. The dairy-protein and lactose explanations are reasonable and unglamorous. They are not the same as a demonstrated cause, and we are not going to upgrade them into one.
It does not support the claims most often attached to colostrum. We graded the performance and body-composition side of that literature as the weakest part of it, and no strength, recovery-time or body-composition claim for colostrum appears anywhere on this site. When we sold a colostrum product its entire claim ledger was two asterisked sentences long. There was never a third, and there is nothing now.
Where this ended for us
Two things about a colostrum document that a colostrum brand is not supposed to volunteer.
A certificate that confirms identity and screens for contaminants has still not told you what you bought the jar for. Identity says the powder is colostrum. The heavy-metal and microbiological rows say what is not in it. Neither is a measurement of immunoglobulin content, and on a colostrum panel that is the number the whole product rests on.
No lot from either of our suppliers carried that assay. Not a low result and not a failed one — the test is not run and the row does not exist. On 31 July 2026 the potency figure came off our front panel for that reason, while the product was still being sold; when the answer came back the same from a second manufacturer, the product came off the range instead. The account, with the dates, is on Testing & Certification.
Which is worth reading on an article about side effects, because the first week is the part of a colostrum purchase most people use to judge it, and it is the least informative part there is. Nothing that happens in week one tells you what is in the powder. A document does, and it is the thing to ask for before the first scoop rather than after the first uncomfortable morning.
More in this cluster: colostrum against whey protein, and why the comparison is malformed, and the two numbers on a colostrum label.