Creatine
Over-the-counterWhat is Creatine?
Creatine is a natural substance found in muscle cells that helps your body produce energy during heavy lifting or high-intensity exercise. Your body makes some creatine on its own, and you also get small amounts from eating meat and fish. Creatine supplements provide a concentrated dose to increase your muscles' stored energy reserves.
People take creatine supplements to improve athletic performance, increase muscle mass, and support workout recovery. Creatine is one of the most researched fitness supplements available. Studies show it can help you lift heavier weights, sprint faster, and build more muscle over time.
Creatine comes in several forms, with creatine monohydrate being the most studied and widely used. It is available as a powder, capsule, or liquid. Most people take it daily as part of their fitness routine.
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Common uses
- Increasing muscle strength and power during resistance training
- Improving high-intensity exercise performance
- Supporting muscle growth and lean body mass
- Enhancing recovery between workout sessions
- Improving sprint performance and repeated sprint ability
- Supporting brain health and cognitive function in some research studies
How it works
Creatine works by increasing the amount of phosphocreatine stored in your muscles. Phosphocreatine helps your body make ATP, which is the main energy currency your cells use during quick, explosive movements. When you lift weights or sprint, your muscles burn through ATP very quickly. Having more creatine available means your body can produce ATP faster and keep your muscles powered for longer.
This extra energy allows you to do more reps, lift heavier weights, or sprint harder before fatigue sets in. Over time, this increased work capacity leads to greater muscle growth and strength gains. Creatine also draws water into your muscle cells, which may trigger signals that promote muscle protein synthesis and growth.
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Dosage information
The most common dosing approach is to take 3 to 5 grams of creatine monohydrate per day. Some people start with a loading phase of 20 grams per day, split into 4 doses, for 5 to 7 days. After loading, they switch to the standard maintenance dose of 3 to 5 grams daily. Research shows that skipping the loading phase and taking 3 to 5 grams daily from the start works just as well. It simply takes a few weeks longer to reach peak muscle saturation. You can take creatine at any time of day, with or without food.
Side effects
- Water retention and temporary weight gain of 2 to 4 pounds
- Stomach discomfort or cramping, especially with large doses
- Nausea or diarrhea if taken on an empty stomach
- Muscle cramping in some users, though research on this is mixed
Serious side effects are rare with proper use. People with existing kidney problems should talk to their doctor before taking creatine. Stop taking creatine and contact your healthcare provider if you experience severe stomach pain, signs of kidney problems like reduced urination, or unexplained muscle weakness.
Drug interactions
- Caffeine may reduce creatine's effectiveness in some studies, though results are mixed
- Nonsteroidal anti-inflammatory drugs like ibuprofen or naproxen may increase kidney stress when combined with creatine
- Diuretics or water pills may interfere with creatine's hydration effects
- Nephrotoxic medications that affect kidney function should be used cautiously with creatine
- People taking medications for kidney disease should consult their doctor before using creatine
Blood test monitoring
Anyone taking creatine supplements should consider monitoring their kidney function regularly. Your kidneys filter creatine and its breakdown product creatinine from your blood. While creatine is safe for healthy people, checking your creatinine levels helps ensure your kidneys are handling the supplement properly. Rite Aid offers blood testing that measures creatinine and other kidney function markers. Testing twice per year lets you catch any changes early. This is especially important if you take higher doses, use creatine long-term, or have risk factors for kidney problems.
Related blood tests
Taking Creatine? Monitor your levels.
- Track how your body responds
- Catch side effects early with blood work
- Share results with your doctor
Frequently asked questions
No, creatine is available over the counter without a prescription. You can find it at Rite Aid and other pharmacies, health stores, and online retailers. Creatine monohydrate is the most researched form and typically the best choice for most people.
If you use a loading phase of 20 grams per day for 5 to 7 days, you may notice benefits within a week. Without loading, taking 3 to 5 grams daily will saturate your muscles in about 3 to 4 weeks. Most people notice improved workout performance and increased muscle fullness once their muscles are fully saturated.
Research shows that creatine is safe for healthy people when used at recommended doses. However, creatine does increase creatinine levels, which is a marker your doctor checks to assess kidney function. If you have existing kidney problems or risk factors, talk to your doctor before taking creatine and monitor your kidney function with regular blood tests.
Creatine supplements naturally increase creatinine levels because creatinine is the breakdown product of creatine. Monitoring ensures that elevated creatinine is from the supplement and not from kidney problems. Regular testing provides peace of mind and helps catch any kidney issues early, especially if you take creatine long-term.
No, research shows you do not need to cycle creatine. Your body continues to benefit from daily creatine supplementation without needing breaks. Taking breaks actually causes your muscle creatine levels to drop back to baseline, which means you lose the performance benefits until you build them back up again.
Yes, most people gain 2 to 4 pounds within the first few weeks of taking creatine. This weight gain comes from water being pulled into your muscle cells, not from fat gain. Over time, you may gain additional weight from increased muscle mass if you are training consistently.
Yes, anyone can benefit from creatine supplementation. While athletes use it for performance, older adults may use it to maintain muscle mass and strength. Some research also suggests potential brain health benefits. Always talk to your doctor if you have health concerns before starting any supplement.
Creatine monohydrate is the most researched and proven form of creatine. Other forms like creatine ethyl ester, buffered creatine, or liquid creatine claim various advantages, but research does not consistently show they work better than monohydrate. Creatine monohydrate is also typically the least expensive option.
Yes, creatine is generally safe to combine with most other supplements like protein powder, BCAAs, or pre-workout formulas. Many pre-workout supplements already contain creatine. If you are taking multiple supplements, read labels carefully to avoid taking too much creatine from combined sources.
Getting your creatinine levels checked twice per year is a reasonable approach for most people taking creatine regularly. Rite Aid offers convenient blood testing that includes creatinine and over 200 other biomarkers for $349 per year. If you have kidney disease risk factors or take high doses, your doctor may recommend more frequent monitoring.