How to Read a Colostrum Supplement Label
A colostrum label can look reassuring while telling you very little. Knowing which lines actually matter — and which are just marketing — is the difference between a product worth buying and an overpriced jar of filler. Here's how to read one like a pro.
1. The IgG percentage
Immunoglobulin G (IgG) is the most-cited active component in colostrum, and quality brands publish a guaranteed minimum — often in the 20–40% range. If the label (or the brand's site) won't state an IgG number at all, treat that as a warning sign: it usually means there isn't much worth advertising.
2. Serving size vs. actual colostrum
Look closely at the "serving size" and what's inside it. A big-looking scoop isn't impressive if half of it is fillers. Find the actual amount of colostrum per serving (in grams or milligrams) so you can compare products fairly — and calculate cost per gram of colostrum, not just price per tub.
3. The ingredient list
The shorter, the better. Colostrum should be the dominant — ideally the only — active ingredient. Be wary of long lists padded with sweeteners, gums, flow agents, and "proprietary blends" that hide how much colostrum you're really getting.
4. Sourcing claims
Helpful signals on a good label include grass-fed, rBGH-free (no added growth hormone), and antibiotic-free, plus a clear country of origin. Ethical brands also note that colostrum is collected after the calf has been fed. Vague or missing sourcing info is a yellow flag.
5. Processing language
The antibodies and growth factors in colostrum are heat-sensitive, so phrases like "low-heat," "low-temperature," or "flash-processed" suggest the maker tried to preserve bioactivity. Heavily heat-treated colostrum can still be a fine protein source but may lose some of its delicate components.
6. Testing and quality seals
"Third-party tested" for potency and contaminants (heavy metals, microbes) is one of the strongest trust signals on any supplement. Manufacturing standards like GMP and transparency about lot testing are good to see too.
7. Allergen statement
Colostrum is a dairy product. The label should clearly flag milk as an allergen. If you're lactose intolerant, look for low-lactose options; if you have a milk allergy, avoid colostrum entirely.
Quick label checklist
| Look for | Good | Red flag |
|---|---|---|
| IgG % | Stated (20–40%+) | Not listed |
| Ingredients | Colostrum-dominant | Lots of fillers |
| Sourcing | Grass-fed, rBGH-free | Vague |
| Processing | Low-heat noted | No info |
| Testing | Third-party tested | None mentioned |
Once you can read a label confidently, the rest is easy. For the bigger picture on comparing products and value, see our colostrum buyer's guide.