Colostrum Supplements: What It Is, If It Works & Which to Buy

By Erin Rose · Updated July 14, 2026 · Methodology

Educational overview — not medical advice. Colostrum is a dairy product; anyone with a cow's-milk-protein allergy should avoid it.

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The chart that explains the category

Colostrum's active fraction is IgG. Here's how much actual IgG you get per serving — and the three brands that won't tell you:

What colostrum is

Colostrum is the first milk a mammal produces in the day or so after birth. Bovine (cow) colostrum is far richer than regular milk in immunoglobulins — chiefly IgG — along with lactoferrin and growth factors like IGF-1 and EGF (Playford & Weiser 2021). Those components are why it's sold for gut and immune support. One honest mechanism note: oral IgG is mostly broken down by digestion, so colostrum's plausible effects are local, in the gut — not the whole-body antibody delivery the marketing sometimes implies.

Does it work? (the short version)

Modestly, and only for specific things. There's reasonable small-trial support for gut-lining protection (NSAID use, and a single acute bout of hard exercise — though a longer chronic-dosing trial found the opposite effect). There's genuine evidence for hyperimmune colostrum against infectious diarrhea — but note that hyperimmune, pathogen-targeted colostrum is not the same product as the wellness tubs sold here, so that evidence doesn't automatically transfer. There's essentially no dedicated trial evidence for the skin, hair, general-immunity, and anti-aging claims driving sales — a 2021 systematic review found the research too weak to support most uses (Guberti 2021). Full breakdown on does colostrum work.

The buying problem: nobody discloses IgG

IgG is the best available proxy for potency, and the category mostly hides it. ARMRA — the TikTok-viral leader — discloses no IgG figure at all; neither does Cowboy or NOW. A handful of brands do state a minimum (Nutricost 30%, Vitamatic 50%, Vital Proteins 40%), which lets you calculate the only honest comparison: cost per gram of actual IgG. On that math, a disclosed value brand runs about $0.59 per gram of IgG while a mainstream name is closer to $2.31 — and ARMRA's is simply unknowable. See the full IgG ranking. (One caveat this ranking can't fix: IgG's evidence-backed benefit is local to the gut, not a systemic immune boost — so this compares value for that narrow use, not a whole-body potency score.)

Who should not take it

Colostrum is milk (casein and whey), so anyone with a cow's-milk-protein allergy must avoid it — reactions have occurred even from topical products (Porcaro 2019). Lactose-intolerant people usually tolerate it, since colostrum is low in lactose. If you're pregnant, immunocompromised, or on medication, check with your doctor first.

Frequently asked questions

Related guides

• Probiotics — the other big "gut health" category, and how to judge strain evidence
• Collagen — another growth-factor/beauty-marketed protein; what the evidence really says
• Electrolytes — another category where the label hides what matters

Sources