Bovine colostrum supplements: does the TikTok trend hold up?

Liquid gold, according to TikTok

Bovine colostrum, the nutrient-dense first milk a cow produces right after giving birth, has become one of the biggest supplement trends of the past two years, marketed in powders and capsules as a fix for gut health, immunity and a vague, glowing sense of wellness. The pitch borrows real biology: colostrum is genuinely rich in antibodies and growth factors, and human colostrum does measurably boost a human infant's immune system. The leap TikTok makes is treating a cow's version, dried into a supplement and taken by an adult, as doing the same thing. That leap is where the evidence gets patchy.

The evidence that actually holds up: fewer colds

The best-supported claim for bovine colostrum in adults is not glowing skin, it is fewer respiratory infections in people under real physical stress. A meta-analysis pooling 5 randomized trials and 152 exercising adults, taking 10 to 20 grams a day for 8 to 12 weeks, found a 44 percent reduction in the number of days spent sick with an upper respiratory infection, and a 38 percent drop in the number of infection episodes, both statistically significant. A separate 158-person trial in medical students, a population under high pathogen exposure, found colostrum reduced infection frequency and severity too, though the benefit concentrated in students at higher baseline risk rather than showing up uniformly. This is real, replicated signal, specifically in people whose exercise load or exposure puts extra strain on their immune system, not necessarily in an average sedentary adult scrolling TikTok.

Where the gut-healing claim gets shaky

The other major pitch, that colostrum seals a leaky gut, rests on thinner and more inconsistent ground. A review of gut-permeability studies in athletes found genuinely mixed results: some trials showed reduced markers of intestinal permeability, one showed no change at all, and one actually showed the markers getting worse. Doses across these trials ranged enormously, from 500 milligrams to 60 grams a day, over periods as short as a week, which makes it hard to draw a single clean conclusion. Cedars-Sinai's own review calls the sealing-the-gut research sparse and contradictory, and its sports medicine physician, Tracy Zaslow, put the honest state of the evidence plainly: we're still at the early stages of any evidence to support supplementing with bovine colostrum, adding that the jury is very much still out on body composition claims specifically.

The conflict of interest worth knowing

One detail belongs in any honest accounting of this trend. Among the researchers quoted defending colostrum's gut-sealing effects, one of the most confident is also disclosed, in the same reporting, as the medical director of a company that manufactures colostrum products. That does not make his research wrong, but it is exactly the kind of financial interest worth weighing against a more skeptical, independent voice. Maddie Pasquariello, a registered dietitian nutritionist, drew the sharpest line on the human-versus-bovine confusion driving the trend: comparing bovine colostrum as a supplement to how human colostrum works for a human infant is different, and as a supplement, there's no real evidence here for the broader claims being made.

Our take

Bovine colostrum is not a fabricated trend, and the respiratory infection evidence is real, if concentrated in athletes and people under high exposure rather than everyone. The gut-healing and general immunity-boosting claims that dominate the marketing are running well ahead of an evidence base that even its more optimistic researchers call early-stage, similar to the gap between marketing and evidence we found looking at raw milk's own health claims. If you train hard or spend your days around a lot of other people's germs, it is a reasonable thing to try. If you are hoping for a gut reset or a glow-up, the science is not there yet.

This is general information, not medical advice. Talk to a clinician before changing anything, especially if you are pregnant, nursing, or managing a condition.