According to Gram Research analysis, a 2026 randomized controlled trial of 72 patients found that Lactobacillus plantarum supplementation significantly improved kidney function in people with moderate to severe chronic kidney disease. The probiotic group showed improved eGFR (kidney filtration rate) over six months, while the placebo group declined, with zero progression to worse kidney disease in the probiotic group versus 8.6% in placebo.
A new study shows that taking a specific probiotic called Lactobacillus plantarum may help slow down kidney disease in people with moderate to severe chronic kidney disease (CKD). Researchers gave 72 patients either the probiotic or a placebo for six months. The group taking the probiotic actually improved their kidney function, while the placebo group got worse. This is exciting because kidney disease currently has few treatment options, and this simple supplement might help protect kidney health without serious side effects.
Key Statistics
A 2026 randomized controlled trial published in Scientific Reports found that 72 patients with stage 3-4 chronic kidney disease taking Lactobacillus plantarum showed significant improvement in kidney function, compared to decline in the placebo group over six months.
In the probiotic trial, zero patients taking Lactobacillus plantarum experienced progression to worse kidney disease, compared to 8.6% of the 72 placebo-treated patients with moderate to severe chronic kidney disease.
A 2026 study of 72 patients found that Lactobacillus plantarum supplementation benefited both diabetic and non-diabetic patients with chronic kidney disease equally, suggesting the probiotic works across different patient populations.
The probiotic dose used in the 2026 trial was 10 billion CFU (colony-forming units) of Lactobacillus plantarum daily, a standard strength available in commercial supplements for kidney disease patients.
The Quick Take
- What they studied: Whether taking a probiotic supplement could slow down kidney disease progression in people with moderate to severe chronic kidney disease
- Who participated: 72 adults with stage 3 or 4 chronic kidney disease (meaning their kidneys were working at 15-59% of normal capacity). The study included both people with and without diabetes.
- Key finding: People taking Lactobacillus plantarum showed improved kidney function after six months, while those taking placebo experienced a decline. No one in the probiotic group had worsening kidney disease, compared to 8.6% in the placebo group.
- What it means for you: If you have moderate to severe kidney disease, a probiotic supplement might help protect your remaining kidney function. However, this is one study, so talk to your doctor before starting any supplement, especially if you take other medications.
The Research Details
This was a randomized controlled trial, which is considered one of the strongest types of medical research. Researchers randomly assigned 72 patients with stage 3 or 4 chronic kidney disease to receive either Lactobacillus plantarum (a beneficial bacteria) or a placebo (fake pill) daily for six months. Neither the patients nor the researchers knew who was getting the real probiotic and who was getting the placebo—this is called “double-blind” and helps prevent bias.
The main measurement was eGFR (estimated glomerular filtration rate), which is a number that shows how well your kidneys are filtering waste from your blood. A higher eGFR means better kidney function. Researchers also measured urinary indoxyl sulfate, a waste product that builds up when kidneys don’t work well.
The study was carefully designed to see if the probiotic could actually slow kidney disease progression, not just improve lab numbers. Researchers tracked both diabetic and non-diabetic patients to see if the probiotic worked for different groups.
This research approach matters because chronic kidney disease is a serious condition affecting about 1 in 10 people worldwide, and doctors currently have very few ways to slow it down. By using a randomized controlled trial, researchers could prove that the probiotic actually caused the improvement, not just that people who took it happened to get better. The double-blind design prevents placebo effect from skewing results.
This study has several strengths: it was published in Scientific Reports (a reputable journal), used a double-blind design, included a placebo control group, and showed consistent results across different patient types. The sample size of 72 is moderate—large enough to be meaningful but not huge. The six-month duration is reasonable for seeing kidney changes. One limitation is that the study didn’t fully explain how the probiotic works, since indoxyl sulfate levels didn’t change as expected.
What the Results Show
The probiotic group showed a significant improvement in eGFR (kidney function), while the placebo group experienced a decline. This difference was statistically significant, meaning it’s very unlikely to have happened by chance. The improvement occurred in both stage 3 and stage 4 kidney disease patients, and worked equally well in people with and without diabetes.
Most importantly, none of the patients taking the probiotic experienced progression to worse kidney disease during the six-month study. In contrast, 8.6% of the placebo group (about 3 out of 35 people) experienced worsening kidney disease. This suggests the probiotic may actually protect kidney function rather than just slowing decline.
The probiotic was well-tolerated with no serious safety concerns reported. The dose used was Lactobacillus plantarum at 10 billion CFU (colony-forming units) daily, which is a standard probiotic strength available in many supplements.
Interestingly, urinary indoxyl sulfate levels (a toxic waste product that builds up in kidney disease) did not significantly decrease in either group, and changes in this marker didn’t correlate with kidney function improvement. This suggests the probiotic may work through a different mechanism than researchers initially expected—possibly by improving gut health, reducing inflammation, or changing how the body processes waste in ways not captured by this single marker.
This study builds on earlier research suggesting that the gut microbiome (the bacteria living in your digestive system) influences kidney health through the “gut-kidney axis.” Previous studies hinted that probiotics might help, but this is one of the first rigorous trials showing clear benefits. The results are encouraging because they suggest a simple, low-cost intervention could help millions of people with kidney disease.
The study lasted only six months, so we don’t know if benefits continue long-term or if people need to keep taking the probiotic forever. The sample size of 72 is moderate—larger studies would provide stronger evidence. The study used only one specific probiotic strain, so we can’t assume all probiotics work the same way. Additionally, the study didn’t fully explain the mechanism of action, since indoxyl sulfate didn’t change as expected. Finally, most participants were likely from a single geographic region, so results may not apply equally to all populations.
The Bottom Line
If you have stage 3 or 4 chronic kidney disease, discuss Lactobacillus plantarum supplementation with your nephrologist (kidney doctor). The evidence from this study is promising (moderate confidence level), but it’s one trial and should be confirmed by larger studies. Do not start any supplement without medical approval, as some probiotics may interact with kidney medications or not be appropriate for your specific situation. If your doctor approves, the dose used in this study was 10 billion CFU daily.
This research is most relevant for people with stage 3 or 4 chronic kidney disease (eGFR between 15-59). It may also interest people at risk for kidney disease, such as those with diabetes or high blood pressure. People with stage 1-2 kidney disease or normal kidney function should not assume this applies to them. Those with severely compromised immune systems should consult their doctor before taking probiotics.
In this study, measurable kidney function improvements appeared within six months. However, kidney disease changes happen slowly, so you shouldn’t expect overnight results. Give any new treatment at least 3-6 months before evaluating effectiveness, and continue regular kidney function monitoring with your doctor.
Frequently Asked Questions
Can probiotics help slow down kidney disease?
Research shows that Lactobacillus plantarum supplementation significantly improved kidney function in a 2026 trial of 72 patients with moderate to severe kidney disease. However, consult your nephrologist before starting, as individual results vary and some probiotics may interact with kidney medications.
What probiotic strain helps chronic kidney disease?
Lactobacillus plantarum at 10 billion CFU daily showed benefits in a recent clinical trial. This specific strain improved kidney function markers in both diabetic and non-diabetic patients with stage 3-4 kidney disease over six months.
How long does it take for probiotics to improve kidney function?
In the 2026 study, measurable kidney function improvements appeared within six months of daily Lactobacillus plantarum supplementation. Kidney changes happen slowly, so allow at least 3-6 months before evaluating effectiveness with your doctor.
Is it safe to take probiotics with kidney disease?
The 2026 trial found no serious safety concerns with Lactobacillus plantarum in 72 kidney disease patients. However, always consult your nephrologist first, as some probiotics may not be appropriate depending on your specific kidney function level and medications.
Do probiotics work for all stages of kidney disease?
The 2026 trial specifically tested stage 3-4 chronic kidney disease (moderate to severe). Benefits were seen in both stages equally. Results may not apply to stage 1-2 disease or normal kidney function, so discuss applicability to your situation with your doctor.
Want to Apply This Research?
- Log daily probiotic supplement intake and track eGFR results from quarterly kidney function tests. Record any changes in energy levels, digestion, or kidney-related symptoms to identify patterns.
- Set a daily reminder to take your Lactobacillus plantarum supplement at the same time each day (consistency matters for probiotics). Pair it with a kidney-friendly meal to improve absorption and create a sustainable habit.
- Schedule quarterly eGFR tests with your doctor and log results in the app. Track any urinary changes, energy levels, or symptoms. After 6 months, review trends to see if the supplement is working for your individual situation. Share data with your nephrologist to inform ongoing treatment decisions.
This article summarizes research findings and is not medical advice. Chronic kidney disease is a serious condition requiring professional medical management. Do not start, stop, or change any supplement or medication without consulting your nephrologist or primary care physician. This research represents one clinical trial; larger studies are needed to confirm findings. Individual results vary, and probiotics may interact with kidney medications or not be appropriate for all kidney disease stages. Always discuss new treatments with your healthcare provider before beginning.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.
