Hormones in Beef: What's Actually in Conventional Meat

In 2020, the beef supply chain broke wide open. Not just logistics — but trust.

Carrie and I were watching the news like everyone else as meatpacking plants shut down, grocery store shelves emptied out, and the price of ground beef spiked higher than we'd ever seen. That was the moment we started asking a question we'd never thought to ask before: where does this beef actually come from? Not which store — but which farm, which feedlot, which animal, and what had been done to it before it hit the styrofoam tray.

We didn't like what we found.

A few months into Covid, I was down a YouTube rabbit hole one evening and stumbled onto a documentary called Carbon Cowboys. It follows a handful of ranchers rebuilding land through regenerative grazing — no synthetic inputs, no feedlots, no shortcuts. That film changed the direction of our lives. But before we could fully appreciate what regenerative ranching offers, we had to understand what conventional beef production actually involves. And that starts with hormones.

What Hormones Are Used in Conventional Beef Production?

The use of hormones in U.S. beef cattle has been legal and common since the 1950s. The Food and Drug Administration has approved six steroid hormones for use in beef production. Three are natural hormones that cattle produce in their bodies: estradiol, progesterone, and testosterone. Three are synthetic hormones developed to mimic or amplify hormonal effects: zeranol, melengestrol acetate (MGA), and trenbolone acetate.

These six hormones fall into two categories. Estrogen-type compounds — estradiol and zeranol — promote growth. Progestin-type compounds — progesterone and melengestrol acetate — are used primarily in heifers as a feed additive to suppress estrus during the feeding period. Androgen-type compounds — testosterone and trenbolone acetate — drive muscle development and feed efficiency.

Most hormone implants are inserted as small pellets under the skin of the ear. The ear is chosen because it's discarded at slaughter and not sold for human consumption. The hormones are slowly released into the animal's bloodstream over weeks or months, stimulating faster weight gain and better feed conversion.

This isn't a fringe practice. The beef industry estimates that somewhere between 80 and 90 percent of U.S. feedlot cattle receive hormone implants at some point during the feeding period. For most Americans, hormones in beef aren't the exception. They're the rule.

Why Does the Industry Use Them?

The blunt answer is cash flow over nutrition.

Commodity beef production is built to maximize the speed at which an animal reaches slaughter weight — and hormones are one of the primary tools for doing that. Feed cattle something unnatural (grain, not grass), add synthetic hormones to accelerate growth, throw in antibiotics to keep animals healthy enough in those crowded conditions, and you can move beef to market faster and cheaper. In our opinion, that model puts faster cash and lower prices ahead of what ends up in the meat your family eats.

We've made a different choice. Feeding only grass and forage the way God designed cattle to eat is a slower process — it takes longer to reach market weight without shortcuts. But the nutritional result is fundamentally different, and that difference is the whole point of what we do.

The beef industry and the USDA's Food Safety and Inspection Service maintain that hormone residues in beef are too small to pose a risk to human health. They point out that endogenous hormones — the ones naturally produced in the animal's body — are already present in beef regardless of implant use, and that the additional exogenous hormones from implants represent a small percentage of total hormone content.

That argument sounds reassuring. But it sidesteps some important questions.

What Does the Research Actually Say?

The industry's position relies heavily on acceptable daily intake limits set by regulatory bodies and on the idea that the human body produces far more hormones naturally than any amount consumed from beef. Both of those points are technically true. They're also incomplete.

A 2024 study published in the Journal of Exposure Science and Environmental Epidemiology analyzed hormonal growth promotants in retail beef purchased across California. Researchers found measurable concentrations of exogenous hormones in beef products, including melengestrol acetate. Under maximum intake scenarios, estimated MGA intake for young children approached or exceeded the World Health Organization's acceptable daily intake threshold. The researchers noted that young girls and boys represented the highest-risk group under these conditions.

That study isn't proof of direct harm. But it raises a legitimate question: if hormone residues in beef can push children toward or past regulatory thresholds under realistic eating patterns, what's the cumulative effect across years of consumption? Especially when those children are also exposed to hormones from other dietary sources, plastics, and environmental contaminants that function as endocrine disruptors?

The European Union asked a version of that question in the 1980s and didn't like the answers. In 1989, the EU banned the import of hormone-treated beef — a ban that still stands today. European regulatory bodies concluded that the science on long-term health effects was not settled, and that consumers deserved the precautionary protection. The U.S. and EU have been in a trade dispute over hormone beef ever since.

That gap tells you something. Not necessarily that hormone beef is definitively dangerous — but that the science is not as settled as the industry wants you to believe, and that reasonable people with access to the same data have reached very different conclusions.

The Labeling Confusion

Walk through any grocery store and you'll see beef labeled "no hormones administered" or "raised without added hormones." Those labels sound like they mean the same thing. They don't always.

Under USDA guidelines, beef labeled "no hormones administered" must come from cattle that never received hormone implants. That's a meaningful claim — if verified. The Food Safety and Inspection Service requires documentation from producers to support the claim, but enforcement relies on producer attestation rather than independent testing.

The term "natural" on beef packaging means nothing about hormone use. It refers only to minimal processing and no artificial ingredients after slaughter. A feedlot steer implanted with trenbolone acetate and zeranol can be sold as "natural beef" the moment it leaves the plant.

Grass-fed beef is a different category — but even that label has nuance. USDA's grass-fed marketing claim specifies that animals must have been fed grass and forage throughout their lifetime, with no grain supplementation. But the standard doesn't include independent verification unless a third-party certification body is involved.

At Texas Grass Fed Farms, our beef is grassfed and grass-finished, never grain-finished, raised on Texas regenerative ranches — no hormone implants, no synthetic growth promotants. We're working closely with our ranch partners toward third-party grass-fed certification, because we believe that kind of verified transparency is what families deserve. For now, our ranchers raise cattle the way God designed them to be raised: on pasture, eating grass, moving across land that's managed for long-term health.

The Regenerative Difference

What the Carbon Cowboys documentary showed us — and what we've confirmed through years of working alongside Texas ranch partners — is that cattle don't need hormones to grow well. They need good grass, clean water, and room to move. When the land is managed regeneratively, with adaptive grazing that mimics the movement patterns of wild ruminants, cattle thrive without any of the pharmaceutical shortcuts that conventional feedlot production depends on.

Grass-fed beef nutrition is measurably different from conventional beef. Grassfed and grass-finished beef from pasture-raised cattle is higher in omega-3 fatty acids, conjugated linoleic acid (CLA), and fat-soluble vitamins like A and E compared to conventional grain-finished beef. The fat itself looks different — yellower in color, richer in beta-carotene from the grass. That's what real beef looks like.

No hormone implants. No synthetic steroid hormones. No melengestrol acetate, no trenbolone acetate, no zeranol. Just beef produced by cattle eating what they were designed to eat, on land managed to support the animals and the ecosystem at the same time.

That's the standard we hold ourselves to. And it's the standard your family deserves.

What to Look For When You Buy Beef

If you're buying beef from a grocery store and you want to avoid hormone-treated products, here's what actually matters:

Look for "no hormones administered" or "no added hormones" combined with third-party verification. Certified organic beef prohibits the use of hormones — that's a meaningful standard, though it doesn't address how the cattle were raised or what they ate. Grass-fed and grass-finished beef from verified sources is your strongest assurance that the animal was raised outside the conventional feedlot system entirely.

Ask questions. A good producer — whether selling direct to consumer or through a reputable retailer — should be able to tell you exactly how their cattle were raised. If the answer is vague, that tells you something.

And if you want to skip the guesswork entirely, we'd be glad to be your source. Every pound of beef we sell comes from Texas ranchers we know by name, on land we've visited, with practices we've verified. Browse our grass-fed beef and see exactly what you're getting.

If you want to go deeper on how food choices affect your hormones, our guides on balancing hormones naturally with food and the foods that quietly destroy testosterone are worth your time.

Frequently Asked Questions

Do hormones in beef affect humans?

The current FDA and USDA position is that hormone residues in beef are too small to cause harm in adults. However, a 2024 study found that under high consumption scenarios, hormone levels in retail beef — particularly melengestrol acetate — could approach or exceed acceptable intake thresholds for young children. The long-term cumulative effects of regular consumption across multiple hormonal exposure sources are not fully understood.

Why did the EU ban hormones in beef?

The European Union banned the use of growth-promoting hormones in cattle production in 1989 and banned the import of hormone-treated beef from the United States and other countries. The EU's scientific committees concluded that evidence on the long-term safety of these compounds in human food was insufficient to guarantee no health risk, and the ban has been upheld despite ongoing trade disputes.

Is grass-fed beef hormone-free?

Grass-fed beef from verified sources does not receive hormone implants. All cattle naturally produce endogenous hormones — estrogen, progesterone, testosterone — as part of normal physiology. But grass-fed, grass-finished beef produced without the use of synthetic or supplemental steroid hormones has significantly lower exogenous hormone residue levels than conventionally raised, implanted cattle.

What's the difference between "natural" and "no hormones administered" on beef labels?

"Natural" beef labeling under USDA guidelines refers only to minimal processing after slaughter — it says nothing about how the cattle were raised or whether they received hormone implants. "No hormones administered" or "no added hormones" is a specific production claim that, when backed by third-party verification, means the cattle did not receive hormone implants during their lifetime.

Troy Patterson
Texas Grass Fed Farms, LLC
"Families Deserve Food That Heals, Not Harms"