Does Creatine Supplements Increase Creatinine Levels? What to Know

Table of Contents

1. Introduction
2. The Biological Connection: Creatine vs. Creatinine
3. Why the eGFR Test Can Be Misleading for Athletes
4. Investigating the Safety Record of Creatine
5. Distinguishing "Pseudo Renal Failure" from Real Concerns
6. A Day in the Life: Integrating BUBS for Peak Performance
7. The 10% Rule: Supplementing with Purpose
8. Beyond Muscle: The Evolving Science of Creatine
9. Navigating the Myths and Misconceptions
10. How to Talk to Your Doctor About Your Supplements
11. Optimizing Your Creatine Protocol
12. Summary: Empowerment Through Education
13. FAQ

Introduction

Imagine receiving a phone call from your doctor with news that your kidney function appears to be in steep decline. For a 42-year-old fitness enthusiast, this scenario became a frightening reality when his routine blood work showed a serum creatinine level of 227 µmol/L—a number typically associated with advanced renal failure. He was told to prepare for a specialist referral and potential lifelong management of kidney disease. However, just two weeks after stopping his daily regimen of performance supplements, his levels returned to the normal range. He didn’t have a kidney disease; he had what clinicians call "pseudo renal failure." This phenomenon is becoming increasingly common as more people turn to functional nutrition to support their active lifestyles.

At BUBS Naturals, we are built on the legacy of Glen “BUB” Doherty, a Navy SEAL, adventurer, and dedicated athlete who believed in pushing the limits of human potential while maintaining the highest standards of integrity. Our mission is to provide clean, science-backed tools for your wellness journey, and that includes providing the clarity you need to navigate complex health data. We often hear from our community members who are concerned about their lab results: does creatine supplements increase creatinine levels? The short answer is yes, but the context behind that "yes" is everything.

In this detailed exploration, we will dive deep into the biological relationship between creatine and creatinine. We will explain why traditional blood tests can sometimes provide a misleading picture of kidney health for athletes and how you can better communicate with your healthcare provider. We’ll also look at the robust safety profile of Creatine Monohydrate, the importance of ingredient purity, and how to integrate this powerhouse supplement into a lifestyle that honors your body’s long-term wellness. By the end of this post, you will understand the difference between a metabolic byproduct and a medical emergency, empowering you to pursue your fitness goals with confidence.

The Biological Connection: Creatine vs. Creatinine

To understand why your lab results might shift when you begin a supplement routine, we have to look at the internal machinery of your muscles. Creatine is a nitrogenous organic acid that occurs naturally in vertebrates. About 95% of the body’s creatine is stored in skeletal muscle, where it exists primarily as phosphocreatine. This molecule is the frontline of energy production during high-intensity, short-duration activities like sprinting or heavy lifting. When your body needs a rapid burst of energy, phosphocreatine donates a phosphate group to turn ADP (adenosine diphosphate) back into ATP (adenosine triphosphate), the primary energy currency of the cell.

Creatinine, on the other hand, is the "exhaust" of this energy-producing engine. It is a waste product that results from the non-enzymatic breakdown of creatine and phosphocreatine. Under normal physiological conditions, about 1% to 2% of muscle creatine is converted to creatinine every day. Because creatinine is a waste product, it enters the bloodstream and is filtered out by the kidneys, eventually leaving the body through urine.

When you supplement with Creatine Monohydrate, you are essentially increasing the size of your fuel tank. By saturating your muscle stores, you provide more substrate for energy production. However, a larger fuel tank also produces more exhaust. If you have more creatine in your system, you will naturally produce more creatinine as a byproduct of normal metabolic turnover. This is why many people see a slight uptick in their serum creatinine levels—it is often a reflection of increased total body creatine stores rather than a sign that the kidneys are struggling to filter the blood.

Why the eGFR Test Can Be Misleading for Athletes

The most common way doctors assess kidney function is by measuring serum creatinine and using that number to calculate an "estimated Glomerular Filtration Rate" or eGFR. The logic behind the eGFR is straightforward: if the kidneys are healthy, they should clear creatinine at a consistent rate. If creatinine levels in the blood rise, it usually suggests that the "filters" (the glomeruli) are not working efficiently.

However, the eGFR is an estimate, not a direct measurement. The formula assumes a "standard" amount of muscle mass and a "standard" dietary intake. This is where the model breaks down for the BUBS community—those who are active, muscular, and focused on high-quality nutrition. Several factors can skew these results without indicating any actual pathology:

1. High Muscle Mass: Since creatinine is a byproduct of muscle metabolism, individuals with more muscle naturally produce more of it. A bodybuilder or a dedicated strength athlete might have elevated creatinine levels simply because they have more "engine" producing "exhaust."
2. Recent High-Protein Meals: Consuming a large amount of cooked meat within 24 hours of a blood test can significantly spike creatinine levels. The heat from cooking converts some of the creatine in the meat into creatinine before you even eat it.
3. Intense Exercise: Strenuous training can cause temporary muscle breakdown and increase the turnover of phosphocreatine, leading to a transient rise in creatinine.
4. Supplementation: As we’ve established, taking Creatine Monohydrate increases the pool of substrate available for conversion into creatinine.

In many cases, an athlete taking creatine might present with an eGFR that looks low (indicating potential kidney stress), even though their actual kidney function is perfectly healthy. This is why we advocate for a "no-BS" approach to your health. If you are taking supplements and see a change in your labs, it is crucial to provide that context to your doctor.

Investigating the Safety Record of Creatine

One of the reasons the "creatine ruins your kidneys" myth persists is a lack of distinction between marker and mechanism. Just because a supplement changes a blood marker (creatinine) doesn't mean it’s harming the organ those markers are supposed to track. In fact, creatine is one of the most thoroughly researched dietary supplements in history, with hundreds of studies backing its safety and efficacy.

A comprehensive meta-analysis published in early 2025 reviewed 21 different studies to determine if oral creatine use led to kidney damage. The researchers found that while supplementation was associated with a modest and transient increase in serum creatinine, there were no significant changes in actual Glomerular Filtration Rate (mGFR) or other markers of renal impairment like cystatin C. Essentially, the kidneys were filtering just as well as before; there was simply more byproduct to filter.

Long-term studies have followed athletes for up to five years, using doses as high as 30 grams per day, and have consistently failed to find evidence of kidney or liver damage in healthy individuals. At BUBS Naturals, we take this safety a step further. We know that the quality of your supplements matters just as much as the ingredients themselves. That’s why our Creatine Monohydrate is NSF Certified for Sport. This means it has been rigorously tested by a third party to ensure it contains exactly what is on the label and is free from contaminants or banned substances. Whether you’re a professional athlete or a weekend warrior, you deserve to know that your fuel is clean.

Distinguishing "Pseudo Renal Failure" from Real Concerns

While the evidence overwhelmingly supports the safety of creatine for healthy adults, it is important to be a mindful consumer of your own health data. The term "pseudo renal failure" describes the situation where lab results mimic a disease state that isn't actually there. But how can you and your doctor tell the difference?

If your serum creatinine is high and your eGFR is low, a more accurate follow-up test is often the Cystatin C test. Unlike creatinine, Cystatin C is a protein produced at a constant rate by all nucleated cells in the body. It is not influenced by muscle mass, high-protein diets, or creatine supplementation. If your Cystatin C levels are normal despite high creatinine, it is a very strong indicator that your kidneys are functioning perfectly and the creatinine spike is simply a byproduct of your lifestyle and supplementation.

It is also worth noting that we always recommend consulting with a healthcare professional before starting a new supplement, especially if you have a pre-existing kidney condition or are taking medications that affect renal function. For those with a healthy baseline, the data suggests that Creatine Monohydrate is a safe, effective tool to support muscle strength, power, and even cognitive health.

A Day in the Life: Integrating BUBS for Peak Performance

Wellness isn't about a single pill or powder; it’s about the synergy of your daily habits. Many members of our community use our products to build a foundation for adventure and longevity. Here’s how a typical day of functional nutrition might look when you’re prioritizing both performance and kidney health.

Your morning might start with a focus on mental clarity and sustained energy. Many of our customers mix a scoop of MCT Oil Creamer into their first cup of coffee. The medium-chain triglycerides provide a quick source of brain fuel, helping you stay sharp for your morning meetings or early workout.

Post-workout recovery is where the heavy lifting happens. This is the ideal time to take your 5-gram serving of Creatine Monohydrate. Because it is unflavored and dissolves effortlessly, you can easily mix it with our Collagen Peptides. While the creatine supports your muscle's ATP stores, the collagen provides the essential amino acids needed to support joint health, skin elasticity, and connective tissue recovery. It’s a powerful duo that addresses both the engine and the chassis of your body.

Throughout the day, staying hydrated is paramount—especially when taking creatine, as it draws water into the muscle cells. To maintain optimal mineral balance without the added sugar found in many sports drinks, we reach for Hydrate or Die. Proper hydration ensures that your kidneys have the fluid they need to efficiently process those metabolic byproducts we discussed earlier.

To round out your routine, you might incorporate Apple Cider Vinegar Gummies to support digestive wellness and metabolic health. This holistic approach ensures that every system in your body is supported, from your gut to your glutes.

The 10% Rule: Supplementing with Purpose

When you choose BUBS, you aren't just buying a supplement; you're joining a mission. Glen "BUB" Doherty lived a life of purpose, and we carry that forward through our commitment to giving back. We donate 10% of all profits to veteran-focused charities, specifically those that help veterans transition back into civilian life and find new missions through fitness and community.

This sense of purpose is why we refuse to cut corners. We believe that if you’re going to put something in your body, it should be the best possible version of that ingredient. Our "no-BS" philosophy means no fillers, no artificial sweeteners, and no questionable additives. We rely on science-backed ingredients like Creatine Monohydrate because we know they work, and we test them rigorously because we know you depend on them. When your wellness routine is built on a foundation of quality and charity, you can feel good about every scoop.

Beyond Muscle: The Evolving Science of Creatine

While most people associate creatine with the gym, modern research is uncovering benefits that extend far beyond the squat rack. This is particularly exciting for those interested in healthy aging and cognitive longevity. As we age, we naturally begin to lose muscle mass—a condition known as sarcopenia. Studies have shown that combining Creatine Monohydrate with regular resistance training can help older adults maintain strength and functional independence.

Furthermore, the brain is a highly metabolically active organ that requires a constant supply of ATP. Emerging data suggests that creatine supplementation may support cognitive function, memory, and mental fatigue, especially during periods of sleep deprivation or high stress. For the vegetarian and vegan members of our community, who typically have lower baseline stores of creatine due to the absence of meat in their diets, supplementation can offer significant benefits for both physical and mental performance.

By supporting your body’s natural energy systems, you are investing in a more vibrant, active future. Whether your goal is to set a new personal record in your 50s or simply stay sharp for your family and career, the science suggests that creatine is a versatile ally in your wellness toolkit.

Navigating the Myths and Misconceptions

Despite the overwhelming evidence of safety, myths about creatine persist. You may have heard that it causes hair loss, severe bloating, or liver damage. Let’s look at what the research actually says:

• Hair Loss: The link between creatine and hair loss stems from a single 2009 study on rugby players that showed an increase in DHT (a hormone linked to hair loss). However, many subsequent studies have failed to replicate these results, and no study has ever directly linked creatine use to actual hair thinning or balding.
• Weight Gain and Bloating: Creatine does cause the body to hold more water, but this water is stored inside the muscle cells (intracellular hydration), not under the skin. This can lead to a slight increase in scale weight, but it is typically associated with a fuller, more "pumped" muscular appearance rather than "fat" gain or generalized bloating.
• Liver Damage: Similar to the kidney myth, there is no evidence that standard doses of creatine harm the liver in healthy individuals. Standard liver function tests (ALT/AST) typically remain unaffected by creatine supplementation.

When we look at the data objectively, the "risks" of creatine are remarkably low, while the potential rewards for strength, recovery, and brain health are incredibly high. By choosing a high-quality, third-party tested product like our Creatine Monohydrate, you are minimizing any potential for impurities that could cause digestive upset or other minor side effects.

How to Talk to Your Doctor About Your Supplements

If you are planning to have blood work done, the best approach is transparency. Tell your doctor exactly what you are taking and why. You might say: "I’m currently taking a daily dose of creatine monohydrate to support my training and muscle health. I understand this can sometimes cause a rise in serum creatinine that isn't related to kidney function. If my eGFR looks low, would you be open to ordering a Cystatin C test for a more accurate picture?"

Most modern healthcare providers are well-aware of the limitations of creatinine-based eGFR tests for athletes, but it never hurts to be your own advocate. You might also consider pausing your Creatine Monohydrate and avoiding intense exercise for 48 to 72 hours before your blood draw if you want to see a "baseline" reading without the influence of recent supplementation.

Remember, your doctor is a partner in your wellness. By providing them with the full context of your functional nutrition routine—including your use of Collagen Peptides for joints or Hydrate or Die for mineral balance—you help them provide more personalized and accurate care.

Optimizing Your Creatine Protocol

If you’ve decided to add creatine to your routine, there are a few ways to ensure you’re getting the most out of it. The "loading phase"—taking 20 grams a day for a week—is often discussed in fitness circles. While this can saturate your muscles faster, it isn't strictly necessary and is the most common cause of temporary stomach upset. For most people, a steady dose of 3 to 5 grams per day is perfectly sufficient to reach full saturation within three to four weeks.

Consistency is more important than timing. Whether you take it in the morning with your MCT Oil Creamer or post-workout with your protein, the key is to take it every day. Since creatine works through saturation over time, skipping doses will eventually lead to lower levels in the muscle.

We also recommend drinking plenty of water. Because creatine increases the amount of water your muscles hold, your overall fluid requirements may increase slightly. Adding a packet of Hydrate or Die to your water bottle is a great way to ensure you’re supporting that intracellular hydration with the right balance of sodium, magnesium, and potassium.

Summary: Empowerment Through Education

The journey to peak wellness is rarely a straight line. It involves questioning assumptions, looking at the data, and choosing tools that align with your values. We’ve seen that while Creatine Monohydrate can indeed increase creatinine levels on a blood test, this shift is almost always a harmless metabolic reflection of your commitment to your fitness. By understanding how your body processes this compound, you can move past the fear of "pseudo renal failure" and focus on the tangible benefits of increased strength, better recovery, and enhanced cognitive function.

At BUBS Naturals, we are honored to be part of your adventure. We take the legacy of Glen Doherty seriously, and we strive to bring the same level of dedication and excellence to our products that he brought to his life. From our NSF-certified Creatine Monohydrate to our versatile Collagen Peptides, every product we make is designed to help you live a life of purpose and vitality.

As you continue to push your boundaries, remember that your health is a long-term investment. Stay hydrated, choose clean ingredients, and don't be afraid to dig deeper into the science behind your supplements. Together, we can redefine what it means to be truly well. Explore the full range of our science-backed tools and see how the BUBS difference can elevate your daily routine.

FAQ

Does taking creatine daily cause permanent kidney damage?

In healthy individuals, there is no evidence that long-term creatine supplementation causes permanent kidney damage. Numerous studies, some lasting up to five years with high doses, have shown that creatine is safe for renal function in people with no pre-existing kidney issues. While it may increase your serum creatinine levels—a marker often used to estimate kidney function—it does not impair the actual filtration capacity of the kidneys. If you have a history of kidney disease, you should always consult your doctor before starting any new supplement, including Creatine Monohydrate.

Why did my eGFR drop after I started taking creatine?

Your eGFR (estimated Glomerular Filtration Rate) is a calculation based on the amount of creatinine in your blood. Because Creatine Monohydrate increases the total pool of creatine in your muscles, it naturally leads to higher levels of its waste product, creatinine. The eGFR formula interprets this increase in creatinine as a sign that your kidneys are filtering less efficiently, when in reality, they are simply processing the additional metabolic byproduct of your supplement. To get a more accurate reading of your kidney function while on creatine, you can ask your doctor for a Cystatin C test, which is not affected by creatine intake or muscle mass.

Should I stop taking creatine before a blood test?

If you want to ensure your blood test reflects your "baseline" creatinine levels without the influence of supplements, you can stop taking Creatine Monohydrate for about 7 to 10 days before your lab work. Additionally, avoiding intense exercise and large amounts of cooked red meat for 48 hours before the test can help prevent temporary spikes in creatinine. However, many athletes prefer to stay on their routine and simply inform their doctor about their supplementation so the results can be interpreted with the proper context.

Is creatine safe for people over the age of 65?

Yes, research increasingly suggests that creatine is not only safe but highly beneficial for older adults. When combined with resistance training, Creatine Monohydrate can help combat age-related muscle loss (sarcopenia) and support bone health. There are also emerging studies indicating that it may support cognitive function and memory in aging populations. As with any age group, staying hydrated with products like Hydrate or Die is important when taking creatine to support optimal fluid balance in the muscles.