Creatine: Not Just for Gym Bros

If you are a regular reader of these blogs, you know I'm not a giant advocate for supplementation. I'm a firm believer that nutrients should come from food, not pills. But I'm also open to consistent science and a compelling mechanism of action for benefit. And I do advocate taking a supplement when a true deficiency is present.

In full disclosure, I currently don't take any supplements myself. Creatine might just be the one I consider. Here's the science behind it, why I'm likely to get on board, and how to decide whether it makes sense for you.

What is creatine, and what does it do?

Creatine is a molecule your body makes on its own that helps your cells recharge their energy supply quickly. Your body runs on something called ATP, its universal energy currency. Think of ATP as the battery that powers everything from muscle contractions to brain function. Creatine serves as a storage depot for that energy. The more creatine you have on hand, the faster your cells can replenish ATP and get back up to full power.

For me, "creatine" always conjured up images of 20-something gym rats endlessly pumping iron. But the full body of research shows this molecule, one that's also naturally found in meat and fish, can do a lot more than help people lift heavier weights. It can help you maintain muscle mass as you get older, and it may boost cognition and mood. For women in particular, it may be one of the most underused tools around.

Who is most likely to run low on creatine?

Vegetarians, vegans, and women are the groups most likely to have less-than-optimal creatine stores. Your body makes roughly 1 to 2 grams per day on its own, and meat and fish can potentially add another 1 to 2 grams. If you eat little or no meat, you're relying mostly on what your body produces.

Here's something I recently learned: women naturally carry about 70 to 80% lower creatine stores than men. Not only do we start out lower, we're also less likely to replenish those stores because women tend to eat less meat. All to say that if you're a woman, or you follow a plant-based diet, you may have the most to gain from this supplement.

What are the proven benefits of creatine?

The strongest evidence is for strength and muscle mass, with growing research on mood and brain function.

Strength and muscle mass. In women, creatine has been shown to help build and maintain muscle, which matters most after menopause, when estrogen drops and muscle loss accelerates. Studies show real gains in strength when creatine is combined with resistance training. Given that I've made a concerted effort to participate regularly in resistance training, this seems like a no-brainer for me.

The benefit isn't limited to women. The evidence for muscle preservation in older adults is strong across the board, with roughly 2.5 extra pounds of lean muscle gained when creatine is combined with exercise, compared to exercise alone. And because muscle mass is central to healthy metabolism and blood sugar control, the effects may reach well beyond physique.

Mood and depression. A randomized controlled trial found that women with major depression who added creatine to their antidepressant (escitalopram, Lexapro®) showed significantly greater, and faster, improvement than those on the medication alone. The theory is that creatine helps restore energy balance in the brain, which may play a bigger role in mood than we've appreciated.

Brain fog and cognition. Creatine has been shown to improve memory, attention, and processing speed, and the gains may be more pronounced in women than in men. Given women's lower baseline stores, that makes mechanistic sense. The effect appears strongest when you're short on sleep, which is exactly when the brain's batteries are most depleted.

What are the real side effects of creatine?

The two side effects with solid evidence behind them are water retention and stomach upset at higher doses.

Water retention: real. Your muscles hold more water when creatine levels are high. Expect 2 to 6 pounds of water weight in the first week or two. It's not fat, it stabilizes, and for most people it's a non-issue.

GI upset: possible at high doses. The "loading phase" (20 grams a day) that some protocols recommend isn't really necessary, and it's where most stomach issues come from. Three to 5 grams a day taken with food minimizes this side effect.

Does creatine damage your kidneys or cause hair loss?

No. Neither concern is supported by the research, though the kidney question deserves a careful explanation.

Creatine supplementation will raise circulating creatinine levels. Creatinine is a byproduct of us living, has no real physiologic function, and is harmless in and of itself. We measure it because the only organ that can remove creatinine from the bloodstream is the kidney. As kidney function deteriorates, creatinine levels rise. So given that creatinine can go up in people taking creatine, worries about kidney health are understandable. To date, however, multiple large reviews have found no impairment of actual kidney function in healthy adults who add creatine to their intakes.

That said, if you have existing kidney issues, talk to your doctor before starting this supplement. And if you don't, make sure your doctor knows you're taking it in case they notice your creatinine levels changing. That heads-up may save you from additional, sometimes expensive, medical testing.

Hair loss: not supported. The concern comes from one small study in 2009 that has never been replicated. No other research has directly linked creatine to hair loss, and mechanistically, the association does not make sense.

Bone density: no direct benefit. Early studies were promising, but a rigorous 2-year trial in postmenopausal women found creatine didn't improve bone mineral density, even when combined with exercise.

How much creatine should you take, and what kind?

Three to 5 grams a day of creatine monohydrate is all you need. Monohydrate is the form with all the research behind it. It's also the cheapest. Fancier versions may cost more, but you're not likely to see enough additional impact to offset the higher price.

One thing you do want is purity. Creapure® is a highly purified (99.9% pure) form of creatine made by a German company, AlzChem. Look for Creapure® being called out by the supplement supplier as its creatine source. And because supplements are notorious for being poorly regulated, I would also favor a creatine monohydrate supplement that is "NSF Certified for Sport." The logo looks something like this:

Athletes are under the microscope in terms of what shows up in their blood. NSF Certified for Sport means the supplement has undergone a different level of scrutiny in terms of what's in, and what isn't in, the product.

A few practical notes. Creatine will not dissolve in a cold beverage, so stir it into something warm if you want to avoid a gritty texture. No loading phase is needed; you'll reach the same place in 3 to 4 weeks, just without the bloating. Timing doesn't matter much, but consistency does, so take it with a meal so you don't forget. And there's no need to overdo it. Going above the 5 gram per day threshold is unlikely to yield much additional benefit but could lead to significant digestive upset.

Is creatine right for you?

Creatine makes the most sense if you exercise regularly, eat well, and fall into one of the lower-stores groups. Two MAJOR caveats before you buy a tub.

First, muscle doesn't build simply because you take creatine. All the strength and muscle building benefits happen ONLY IF you engage in regular physical activity, especially resistance training. Otherwise, as with all extraneous supplements, you will only be creating expensive urine.

Second, no supplement can replace the fundamentals of a healthful diet. Creatine is a SUPPLEMENT, not a core nutrient, and no amount of ATP can drive a cell that's poorly nourished. Getting meaningful doses of the nutrients that matter from real food is the entire premise behind Step One Foods, and it's why we tested our foods in a randomized controlled trial conducted with Mayo Clinic and the University of Manitoba rather than asking anyone to take our word for it.

So here's my bottom line. Creatine isn't magic, but it is one of the most thoroughly studied, safest supplements available, with benefits that appear to go well beyond the gym. For women, especially those navigating midlife changes, for older adults trying to hold onto muscle and mental sharpness, and for anyone eating a plant-based diet, the case for considering it is genuinely strong. As I fit into all three of those categories, I'm getting on board.