Bodybuilders and elite athletes have turned to creatine supplements to boost their fitness for years. But now, they aren’t the only ones using it. More women and adults over 40 are using or thinking about creatine to support their muscle strength, stay active and age well.
Are you wondering whether creatine could be helpful for you and how safe it is? Here’s what science says and what to consider.
What is creatine?
“Creatine is a natural compound your body produces in the kidney and liver. You can also get it in your diet from eating red meat and seafood,” said Cassie Heisinger, a pharmacist with Banner Pharmacy Services.
Your body stores about 95% of its creatine in your skeletal muscles, where it helps them make energy. The rest of the creatine is stored in your brain and heart.
Creatine helps your muscles pump out quick energy during movement. That’s important when you need short bursts of effort, like when you’re lifting something, climbing stairs or getting up from a chair.
Creatine supplements can increase the amount of creatine your muscles store. That can support strength and performance when you’re exercising.
Why muscle health matters more after 40
Starting in midlife, most adults gradually lose muscle mass, strength and function, especially if they don’t do any strength training.
When this loss becomes significant, it is called sarcopenia. It can affect balance, mobility and independence over time.
Maintaining muscle helps you:
Keep your metabolism active
Stay strong and mobile so you can keep up with your daily activities
Protect your joints
Maintain or increase bone strength
Reduce the risk of falls and the fractures they can cause
Regulate your blood sugar
Support long-term physical and mental health and independence as you age
“Strength training plus enough protein in the diet may help prevent or slow the process of age-related muscle decline,” Dr. Heisinger said. Supplements like creatine may also help some people.
How creatine may help women and adults 40+
Creatine may have benefits even if you’re not an elite athlete, especially when you pair it with resistance exercise.
Possible benefits include:
Stronger muscles
More lean muscle mass
Being able to exercise for longer
Staying mobile as you get older
Creatine is also being studied for its potential role in brain health, mental health conditions such as treatment resistant depression and anxiety, neurodegenerative disorders and in certain groups, such as vegans who tend to have lower baseline creatine levels. Research is ongoing.
Creatine for women: clearing up common myths
Many women aren’t sure about trying creatine because they’re concerned they might gain weight or bulk up.
Creatine does not cause fat gain. Some people notice a small increase in weight at first because the muscles store more water. This is not the same as gaining body fat.
Creatine does not alter hormones or make women build large muscles unless that’s their goal and they are putting a lot of time and effort into strength training. For most women, it supports muscle strength and performance, not size.
Is creatine safe for adults over 40?
Creatine is one of the most studied supplements for healthy adults. “Creatine is generally considered safe for healthy adults when they follow dosing recommendations,” Dr. Heisinger said.
The most common side effects are dehydration, diarrhea, upset stomach, muscle cramps and water retention.
However, creatine is not for everyone. People with these conditions need to be cautious.
Kidney disease or medications that affect kidney function: You shouldn’t take it unless your health care provider recommends it.
Bipolar disorder: Creatine may make mania worse.
Parkinson’s disease: Caffeine and creatine together may make symptoms worse.
Pregnancy and breast-feeding: There isn’t enough reliable information to know if creatine is safe, so it’s best to avoid it.
Unexplained muscle cramps or dehydration: Creatine could make these symptoms worse.
Personal guidance is important when it comes to supplements. If you take medications or have health concerns, it’s a good idea to talk with a provider before starting any supplement.
How to use creatine safely
If you decide to try creatine, here are a few guidelines:
Choose creatine monohydrate, which has been researched the most.
Choose supplements that are third-party tested by organizations such as USP, NSF, Informed Choice/Informed Sport or ConsumerLab or ask your pharmacist or physician for brand recommendations.
A typical dose is about three to five grams per day. You don’t need a loading phase, which is where you take a higher dose for several days before switching to a typical dose. “A loading phase can cause more gastrointestinal side effects,” Dr. Heisinger said.
Mix the powder into water, juice or smoothies. You can take it with or without food and at any time of day.
Drink enough water throughout the day.
Take it consistently, not just on workout days.
Do you need to exercise for creatine to work?
Creatine works best when you combine it with strength or resistance training. Without exercise, its benefits are limited for improving strength but you don’t need to lift heavy weights to see improvement. Consistent, moderate strength training can make a difference.
Activities that pair well with creatine include:
Weight training
Resistance bands
Bodyweight exercises
Functional movements that support daily life
What creatine does not do
Creatine is not a quick fix. It’s a tool, not a solution by itself. It does not:
Replace exercise or protein
Burn fat on its own
Prevent aging
Work without consistent use
The bottom line
Creatine isn’t just for athletes. For some women and adults over 40, it may help support muscle strength and healthy aging when used safely and paired with exercise.
“Creatine is a supplement, not a replacement for healthy habits. It works best when combined with regular strength training, enough protein intake and a balanced diet. Together, these strategies can help support muscle mass and strength as you age,” Dr. Heisinger said.
If you’re curious about creatine or other supplements, a Banner Health provider can help you decide what fits your health goals and needs.
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