Active vs Total IgG in Colostrum: Why Accuracy Matters More Than Big Numbers
You're looking at two colostrum products. One claims 25,000 mg of IgG. The other claims 18,000 mg. Which one is actually better? The honest answer: you can't tell from those numbers alone. The difference between active and total IgG is the gap between real bioavailability and marketing spin, and it's where most colostrum brands quietly stumble.
Active vs Total IgG: The Plain English Version
Let's strip away the science speak. IgG is an immunoglobulin—basically, an antibody your immune system uses to recognize and neutralize pathogens and support gut health. When brands report "total IgG," they're measuring the raw protein amount in the powder. When they report "active IgG," they're measuring how much of that protein is actually intact and functional.
The catch? Many colostrum brands use aggressive processing—high heat, harsh chemicals, or rough handling—that damages the protein structure. The IgG molecules break apart, lose their shape, and become biologically inactive. But they still show up on a standard protein test. So a brand can truthfully claim 25,000 mg of IgG while delivering mostly useless protein fragments.
This is where turbidity-corrected testing comes in. It's a more precise measurement that accounts for protein denaturation (damage), so you get a true picture of bioactive IgG—the stuff your body can actually use.
How Processing Affects IgG: The Science Layer
Colostrum is delicate. The bioactive compounds—IgG, lactoferrin, growth factors, and others—evolved to survive a newborn calf's digestive system, but they're sensitive to temperature and mechanical stress.
When colostrum is spray-dried at 70°C or higher, or frozen and thawed repeatedly, or processed in ways that agitate the protein, the molecular structure changes. The IgG unfolds or aggregates. It doesn't function the same way in your body. Research suggests that bioactive IgG supports immune tolerance, reduces intestinal permeability, and may help maintain healthy inflammatory responses—but only if the protein remains intact.
Some brands report inflated IgG numbers because their testing method doesn't distinguish between active and denatured protein. It's like counting broken tools in a toolbox as if they still work. The number looks impressive, but the outcome doesn't match the promise.
How kare Gets IgG Right
We process colostrum fresh within 48 hours of collection using low-temperature spray drying at 37-60°C. That's a 20-degree difference from the industry standard, and it matters. The result is bioactive IgG that stays intact.
More importantly, we test accurately. Our turbidity-corrected IgG testing doesn't inflate numbers—it tells you exactly how much active, functional IgG you're getting. If that number is lower than a competitor's claim, that's not a weakness. It's transparency. A lower accurate number beats a higher inflated one, every time.
Our colostrum comes from grass-fed, pasture-raised cows on New Zealand's South Island, below the Southern Alps. They roam outdoors 365 days a year on fresh grass. NZ cows aren't routinely vaccinated or artificially stressed, which means their colostrum naturally reflects a calm, healthy immune environment. We never freeze our colostrum before processing—it goes from cow to powder within two days, preserving bioactivity from start to finish.
And because ethics matter: calves receive their first 4 litres of colostrum before we collect anything. Our cows and their calves aren't sacrificed for our supply.
Why This Matters for Your Health
If you're taking colostrum to support gut microbiome balance or to strengthen immune resilience, you need active IgG doing the work. Marketing numbers don't help you. Real bioactivity does.
The next time you're comparing colostrum products, ask one simple question: What's your active IgG, and how do you test it? If they can't explain the difference, or if they dodge the question, you already know what's happening behind the scenes.
We believe quiet confidence beats hype. Our testing is transparent, our processing is gentle, and our IgG numbers are real. Try kare and feel the difference that bioactive colostrum actually makes.
