What Is Truly Grass Fed™ Certification?
The Truly Grass Fed™ standard is one of the most rigorous grass-fed certifications in the world.
To qualify, farms must meet all of the following:
95% grass diet. Cows eat grass, hay, silage, and forage. A maximum of 5% supplemental feed is allowed—only for health and nutrition purposes.
250+ days on pasture. Cows live and graze outdoors year-round, with daily access to pasture except during milking, severe weather, or veterinary care.
No hormones, ever. Cows are never given rBST or any other artificial growth hormones at any point in their lives.
Double-tested for antibiotics. Every milk tanker is tested at the farm and again at the plant before use. Zero tolerance.
Independent audits. Farms are audited every ~18 months by ISO-accredited inspectors (SGS) under Ireland’s national dairy assurance program, and checked against national farm survey data.
Why Does Grass-Fed Certification Matter?
In the U.S., “grass-fed” has no legal definition for dairy. The FDA doesn’t regulate the term.
That means a cow can spend most of its life eating grain, graze occasionally, and still produce milk marketed as “grass-fed”—or even “100% grass-fed.”
This isn’t a technicality. It’s standard practice.
In New Zealand—a country that built its dairy reputation on grass-fed imagery—the largest dairy co-op labeled its products “100% grass-fed” while allowing up to 20% of the cows’ diet to come from grain or supplemental feed. They only dropped the claim after legal action from Greenpeace.
The supplement industry is worse.
Many brands slap “grass-fed” on their casein with no sourcing details, no third-party verification, and no information about pasture time or feed composition. Your only option is to trust them.
We don’t ask you to trust us. We prove it.
Casein+ is made with milk from approximately 3,000 small family farms in Southeast Ireland, supplying plants in Wexford, Ballyragget, and Belview.
Unlike industrial US dairies that push year-round production, Irish cows calve in spring to match natural grass growth and graze on open pastures for up to 300 days a year.
Every farm is independently certified. Every claim is audited. The 95% grass-fed standard is measured on a rolling 3-year average—because weather happens, but the standard holds.
Without third-party certification, you’re relying on the honor system. That’s what the seals on your Casein+ label mean: you don’t have to trust us. You can verify.
The Bottom Line on Grass-Fed Whey
In the supplement industry, if a brand asks you to “just trust us bro,” don’t.
When you see “certified grass-fed” on our grass-fed protein isolate, it’s there because there’s a standard, an auditor, and a paper trail behind it—not because our designer thought it looked nice.