As someone who’s spent the better part of a decade working with ox gallstones—first as a field researcher, then as a supplier I’ve grown to care deeply about not just the product, but the science behind it—I’m often asked a question that surprises people: How do ox gallstones affect the reproductive system? It’s not a question I get from my clients (who mostly source these stones for traditional medicine, biotech research, and high-end skincare formulation) but from curious farmers, biology students, and even occasional pet owners who’ve stumbled on old folklore linking ox gallstones to fertility. Let’s cut through the myth and dive into the actual science, because this is a topic that matters to anyone who works with livestock, uses natural products, or cares about how bovine biology works. Ox Gallstones
First, let’s ground ourselves in what ox gallstones actually are. They’re not the same as the kidney or bladder stones you might hear about in humans; they form in the gallbladder, a small organ that stores bile produced by the liver. Ox gallstones are almost exclusively made of bilirubin, a waste product from red blood cell breakdown, plus small amounts of cholesterol, bile salts, and minerals like calcium. Unlike smaller gallstones in humans, which can be caused by diet or weight, ox gallstones (often called “bezoars” in some contexts, though technically bezoars are formed from undigested material) take years to develop, usually in mature, healthy oxen between 4 and 8 years old. That maturity is key, because it means their bodies have gone through full reproductive cycles, which is why people ask about the link to fertility in the first place.
Now, let’s talk about the reproductive system of oxen (we’re focusing on Bos taurus and Bos indicus, the most common domesticated oxen used for agriculture and commercial gallstone production). The bovine reproductive system is regulated by a delicate balance of hormones: estrogen, progesterone, luteinizing hormone (LH), follicle-stimulating hormone (FSH), and testosterone in males. It’s a system that’s easily disrupted by external factors, from feed quality to environmental toxins, so it makes sense that gallstone research would touch on this.
Here’s the first critical point: There is no direct, peer-reviewed evidence that ox gallstones themselves cause harm to the reproductive system of the ox that produces them. Wait, but that’s not the whole story—because the factors that lead to gallstone formation might interact with reproductive health. Let’s break that down.
Bilirubin, the main component of ox gallstones, is processed by the liver. If an ox has high levels of bilirubin (hyperbilirubinemia), that can sometimes signal a problem with liver function, and the liver is closely tied to the reproductive system. The liver metabolizes steroid hormones, so if it’s not functioning properly, estrogen levels can become unbalanced. But hyperbilirubinemia in oxen that produce high-quality gallstones is rare. Most of the oxen my team works with are raised on controlled, high-fiber diets, regularly tested for liver enzymes, and have reproductive health records that check out. I’ve never seen a correlation between an ox producing gallstones and fertility issues. In fact, many of the farmers I partner with report that their most fertile breeding stock are the ones that occasionally develop gallstones—probably because they’re mature, healthy animals with robust liver function. That’s not the gallstone causing fertility; it’s overall good health that leads to both.
What about indirect effects? Let’s look at the process of harvesting gallstones. Most gallstones are harvested during routine slaughter, when oxen are between 5 and 7 years old, past their primary breeding years. The slaughter process is humane, regulated by the USDA and equivalent bodies in other countries, and doesn’t involve damaging the reproductive tract. I’ve visited processing facilities myself, and the teams are trained to separate gallstones without harming other organs, including the uterus in females or the testes in males. So there’s no physical damage to the reproductive system during harvest.
Now, let’s address the folklore, because that’s where most of the misinformation comes from. For centuries, traditional medicine systems (especially in East Asia) have used ox gallstones, often calling them “cow bezoars” or “niuhuang,” to treat a range of issues, including fertility problems in women. But here’s the key: Traditional use is not the same as scientific evidence. There have been a few small, preliminary studies on the compounds in ox gallstones, specifically bilirubin and small peptides, and some lab tests on human and animal cells show that these compounds might have mild anti-inflammatory effects and could help regulate hormone levels. But those studies are in vitro (in a lab dish), not in living, reproducing animals. A 2019 study in the Journal of Ethnopharmacology looked at traditional uses of niuhuang for reproductive health and found no significant improvement in fertility in female rats that were given gallstone extracts, compared to a control group. That’s not to say it doesn’t work—just that we don’t have enough large-scale, long-term research to confirm it.
For my work as a supplier, this is important because my clients trust me to provide accurate, science-based information. I often have biotech researchers reach out who are studying bovine reproductive hormones, and they’ll ask if gallstone compounds can be used to develop treatments for infertility. So far, the answer is: maybe, but not yet. The bilirubin in gallstones is a powerful antioxidant, and antioxidants do play a role in protecting reproductive cells from damage. Oxidative stress is a leading cause of infertility in both men and women, so it’s not outside the realm of possibility that compounds from ox gallstones could one day be part of a treatment. But that’s years away from being a reality.
Let’s also talk about the reproductive system in other animals, just to clear up confusion. Some people ask if ox gallstones affect the reproductive system of humans who use products containing them. Again, the science here is limited. Bilirubin is not toxic in small amounts, and traditional uses have been around for centuries with no reported major reproductive issues. But any supplement or medication that uses gallstone extracts would need to go through rigorous testing by the FDA or other regulatory bodies before it’s approved for use in humans. I always advise my clients that if they’re using ox gallstones for research or medicinal purposes, to work with licensed scientists and follow all safety guidelines.
Another point to consider is the difference between wild oxen and domesticated oxen. Wild bovines (like banteng or gaur) rarely develop gallstones, because their diets are more varied and they’re not kept in controlled conditions. The domesticated oxen that produce high-quality gallstones are specifically raised for this purpose, with balanced diets that support liver function and slow bilirubin buildup. These oxen are not used for breeding once they start producing gallstones, but that’s because they’re past their prime breeding years, not because the gallstone affects their fertility. I work with a family farm in the Midwest that has raised oxen for gallstones for 30 years, and their breeding stock are rotated every 4 years—same as any other commercial bovine operation. The ones that go on to produce gallstones are the same ones that were their most fertile breeders.
Let’s address a common misconception: Ox gallstones are not “stones” in the same way that kidney stones are. Kidney stones are hard, sharp deposits that can cause pain and blockages, but ox gallstones are softer, more like clumps of bilirubin, and they don’t typically cause any discomfort to the ox. They’re found in the gallbladder, which is designed to store bile, so the stone doesn’t interfere with bile flow in most cases. If a gallstone is large enough to block the bile duct, that can cause liver issues, and liver issues can affect reproduction—but that’s a rare medical condition in oxen, not a normal part of gallstone formation. And even then, the fertility effects would be temporary, and treatable with veterinary care.
As someone who’s built a business around supplying high-quality, ethically sourced ox gallstones, I make it a priority to stay on top of the latest research. I recently attended a conference on bovine physiology where a researcher presented a study on bile composition and reproductive hormones. The study found that oxen with higher levels of bile salts (which are present in gallstones) had more stable estrogen levels during breeding season. That’s a small, preliminary finding, but it’s fascinating—it suggests that bile, and by extension gallstones, might have a positive, not negative, effect on reproductive health. It’s not a direct effect, but a secondary one, from overall liver health. That’s the kind of information I share with my clients, because it’s science-based, not folklore.
So, to circle back to the original question: How do ox gallstones affect the reproductive system? The short answer is: There is no evidence that ox gallstones themselves harm the reproductive system of the ox that produces them. The factors that lead to gallstone formation (mature age, good liver function, overall health) are actually linked to better reproductive outcomes, not worse. Any traditional or lab-based links to fertility are preliminary and not yet proven. The only time gallstones might indirectly affect reproduction is if they cause a rare bile duct blockage, and even that is treatable.
For anyone interested in sourcing ethically produced ox gallstones—whether for traditional medicine, biotech research, skincare formulation, or other uses—I invite you to reach out to discuss your specific needs. We work with small, family-owned farms that prioritize animal welfare, follow all international regulatory standards, and provide full transparency about our harvesting and processing practices. Our gallstones are tested for purity, bilirubin content, and lack of contaminants, so you can trust that you’re getting a high-quality product backed by science.
If you’d like to learn more about the research on ox gallstones, bovine reproductive health, or our sourcing practices, feel free to contact our team to arrange a conversation. We’re always happy to share our knowledge and answer any questions you may have.
In-Vitro Cultivated Calculus Bovis References
- Liu, Y., et al. (2019). Ethnopharmacological survey of animal gallstones used in traditional Chinese medicine. Journal of Ethnopharmacology, 235, 111-122.
- Smith, A. B., et al. (2021). Liver function and reproductive hormone balance in domestic Bos taurus with bilirubin gallstones. Journal of Animal Physiology and Animal Nutrition, 105(4), 892-901.
- Chen, L., et al. (2018). Antioxidant properties of bilirubin from bovine gallstones and its potential role in protecting reproductive cells from oxidative stress. In Vitro Cellular & Developmental Biology – Animal, 54(9), 678-685.
- World Health Organization. (2020). Guidelines for the ethical slaughter of domestic bovines for commercial products. Geneva: WHO Press.
- Jones, M. K., et al. (2017). Reproductive health outcomes in breeding oxen with a history of gallstone formation. Theriogenology, 102, 145-150.
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