A 2026 laboratory study found that lovastatin, a natural compound from Monascus mold, reduced methane production from sheep feed by 22.1 percent at a dose of 100 milligrams per kilogram. According to Gram Research analysis, this reduction occurred because lovastatin shifted the microbial community in the digestive system, increasing beneficial bacteria while decreasing methane-producing microbes. The research suggests lovastatin could become a natural tool for farms to reduce livestock emissions, though animal trials are needed before widespread use.
According to Gram Research analysis, scientists tested a natural substance called lovastatin to see if it could reduce methane gas produced by sheep during digestion. Methane from livestock is a major contributor to climate change. In a laboratory study published in 2026, researchers added lovastatin to sheep feed and found it reduced methane production by over 22 percent compared to regular feed. The lovastatin came from a type of mold called Monascus, which is already used to make some foods. The best results happened at a specific dose, suggesting this natural compound could help farms reduce their environmental impact while keeping animals healthy.
Key Statistics
A 2026 laboratory study published in Microorganisms found that 100 milligrams of lovastatin per kilogram of sheep feed reduced methane production by 22.1 percent compared to untreated feed.
Lovastatin supplementation at 100 milligrams per kilogram increased feed digestibility by 4.9 percent while decreasing methane content by 12.7 percent in the laboratory study.
The 2026 research showed that lovastatin enriched four beneficial bacterial groups (Rikenellaceae RC9 gut group, Eubacterium, Succinivibrionaceae UCG-001, and Anaerovibrio) while reducing two methane-producing microbes (Methanococcus and Methanosphaera).
The Quick Take
- What they studied: Whether a natural substance called lovastatin could reduce the amount of methane gas produced when sheep digest food in their stomachs.
- Who participated: This was a laboratory experiment using sheep feed samples, not live animals. Researchers tested different amounts of lovastatin mixed into typical sheep feed over 48 hours.
- Key finding: Adding 100 milligrams of lovastatin per kilogram of feed reduced methane production by 22.1 percent and methane content by 12.7 percent compared to feed without lovastatin.
- What it means for you: This research suggests farms could potentially use lovastatin as a natural additive to reduce livestock methane emissions, which contribute to climate change. However, this was a lab study, so more testing on actual animals is needed before farms could use it widely.
The Research Details
Researchers conducted an in vitro study, which means they performed the experiment in a laboratory dish rather than with live animals. They took feed that sheep normally eat (a mix of grains and hay) and added different amounts of lovastatin to it: none, 50 milligrams, 100 milligrams, or 150 milligrams per kilogram of feed. They then let the feed sit for 48 hours in controlled conditions that mimicked what happens inside a sheep’s stomach, measuring how much methane gas was produced and how well the feed was broken down.
For the most detailed analysis, they used genetic testing on samples from the control group and the 100-milligram treatment to see which bacteria and microbes were present. This helped them understand why lovastatin was working. Lovastatin itself came from a natural source: a type of mold called Monascus that is already used in food production in some countries.
This research approach is important because it allows scientists to test new ideas quickly and safely before trying them on actual animals. By studying what happens in a controlled laboratory environment, researchers can identify the right dose and understand the biological mechanisms without the time and expense of full animal trials. The genetic testing component helps explain not just that lovastatin works, but how it works by showing which helpful bacteria increase and which methane-producing bacteria decrease.
This study was published in a peer-reviewed scientific journal called Microorganisms, meaning other experts reviewed it before publication. The researchers used modern genetic sequencing technology to identify microbes, which is a reliable method. However, this was a laboratory study using feed samples, not live animals, so results may differ in real farm conditions. The study tested only one type of animal feed and one source of lovastatin, so results might vary with different feeds or lovastatin sources.
What the Results Show
The main finding was that lovastatin significantly reduced methane production. At the 100-milligram dose, methane production dropped by 22.1 percent and methane content (the percentage of gas that was methane) dropped by 12.7 percent compared to the control group with no lovastatin. This is important because methane is a potent greenhouse gas that contributes to climate change.
Interestingly, the feed was also broken down more efficiently when lovastatin was added. The in vitro dry matter degradation (how much of the feed was actually digested) increased by 4.9 percent at the 100-milligram dose. This suggests lovastatin not only reduces methane but might also help animals get more nutrition from their food.
The genetic analysis revealed why this was happening. Lovastatin increased the abundance of four types of bacteria that help with digestion: Rikenellaceae RC9 gut group, Eubacterium, Succinivibrionaceae UCG-001, and Anaerovibrio. At the same time, it decreased two types of methane-producing microbes called Methanococcus and Methanosphaera. This shift in the microbial community explains the reduction in methane.
At the highest dose tested (150 milligrams per kilogram), the proportion of propionate, a type of fatty acid produced during digestion, was higher than in other groups. Propionate is actually beneficial because it provides energy to the animal. At the 100-milligram dose, microbial crude protein (MCP) concentration was higher, which means more protein was being produced by the microbes in the digestive system. However, total gas production and overall volatile fatty acid concentration (the main products of digestion) did not change significantly across any of the treatment groups, suggesting lovastatin specifically targets methane production without disrupting normal digestion.
This research builds on previous work showing that various natural compounds can reduce methane from livestock. Lovastatin is particularly interesting because it comes from Monascus mold, which is already recognized as safe in food production in many countries. Previous studies have tested synthetic methane inhibitors, but natural alternatives like lovastatin are increasingly attractive to consumers and regulators. This study is among the first to specifically examine lovastatin’s effects on rumen fermentation and methane production, filling a gap in the scientific literature.
This study has several important limitations. First, it was conducted in a laboratory using feed samples, not in live animals. What happens in a test tube may not perfectly match what happens inside a real sheep’s stomach. Second, the study only tested one type of sheep feed, so results might differ with different feed compositions. Third, the sample size and specific details about the experimental setup were not fully described in the abstract. Fourth, this was a short-term study lasting only 48 hours, so we do not know if lovastatin would remain effective over weeks or months of feeding. Finally, the lovastatin was obtained from Monascus fermentation, and results might vary depending on the source or purity of the lovastatin used.
The Bottom Line
Based on this laboratory research, lovastatin shows promise as a natural methane-reducing additive for livestock feed. The most effective dose appears to be around 100 milligrams per kilogram of feed. However, these findings are preliminary and based on laboratory conditions. Before farms should use lovastatin, researchers need to conduct studies on live animals to confirm these results work in real conditions, determine the best long-term dosing strategy, and ensure there are no unexpected side effects. Confidence level: Moderate for laboratory efficacy, Low for real-world farm application until animal trials are completed.
This research is most relevant to livestock farmers, agricultural scientists, and environmental policymakers interested in reducing methane emissions from cattle and sheep farming. It may also interest consumers concerned about the environmental impact of meat production. However, individual consumers should not attempt to use lovastatin as a feed additive without veterinary guidance, as this research is preliminary. Farmers should wait for results from animal trials and regulatory approval before implementing this strategy.
In this laboratory study, the effects on methane production were measurable within 48 hours. However, if lovastatin were used on actual farms, it would likely take several weeks to see the full effects as the microbial community in an animal’s digestive system gradually shifts. Long-term studies would be needed to determine if the benefits persist over months of feeding.
Frequently Asked Questions
Can lovastatin reduce methane from cows and sheep?
Laboratory research from 2026 shows lovastatin reduced methane production by 22 percent in sheep feed samples. However, this was a lab study, not on live animals, so more research is needed to confirm it works on actual farms before widespread use.
What is the best dose of lovastatin for reducing livestock methane?
In this laboratory study, 100 milligrams of lovastatin per kilogram of feed produced the best results, reducing methane by 22.1 percent. Higher doses did not improve methane reduction, though they did increase other beneficial compounds.
Is lovastatin safe to use in animal feed?
Lovastatin comes from Monascus mold, which is already recognized as safe in food production in many countries. However, this study only tested it in laboratory conditions. Animal safety trials are needed before farms can use it.
How does lovastatin reduce methane in livestock?
Lovastatin changes which bacteria live in the animal’s digestive system. It increases helpful bacteria that aid digestion while decreasing methane-producing bacteria, shifting the microbial community to produce less methane overall.
When will farms be able to use lovastatin to reduce emissions?
This laboratory research is preliminary. Researchers must conduct studies on live animals, determine long-term safety and effectiveness, and obtain regulatory approval before farms can use lovastatin. This process typically takes several years.
Want to Apply This Research?
- For farmers or agricultural professionals using a nutrition tracking app, record weekly methane measurements (if available through farm monitoring equipment) alongside lovastatin dosage amounts to track correlation between supplementation and emissions reduction over time.
- If this research eventually leads to approved farm use, farmers could set a reminder to add lovastatin to feed at the optimal 100-milligram per kilogram dose and track feed efficiency metrics (weight gain per unit of feed) to monitor both environmental and economic benefits.
- Establish a baseline measurement of current methane production or feed efficiency, then monitor these metrics weekly after introducing lovastatin supplementation. Compare results against the baseline and adjust dosage if needed, while documenting any changes in animal health or feed consumption patterns.
This research describes laboratory findings in controlled conditions and has not yet been tested on live animals. Lovastatin should not be added to livestock feed without veterinary guidance and regulatory approval. Results from laboratory studies may not translate directly to real-world farm conditions. Farmers should consult with veterinarians and wait for animal trials and regulatory clearance before using lovastatin as a feed supplement. This article is for informational purposes and does not constitute medical or veterinary advice.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.