Creatine

What is Creatine?

Creatine is a compound your body makes naturally and stores mostly in your muscles, where it helps supply quick energy for short, intense efforts. You also get it from meat and fish. As a supplement, creatine monohydrate is a cheap, flavorless powder that has been studied for decades. It is one of the most researched supplements in existence. Long known to gym-goers, it is now drawing interest from the longevity crowd for reasons beyond muscle.

What does Creatine claim to do?

The classic claims are about strength, power, and muscle size. The newer longevity claims go further: that creatine supports muscle maintenance as you age, supports bone health when paired with exercise, and may support brain function, memory, and mental sharpness, especially under stress, sleep deprivation, or in older adults.

Why do people use Creatine?

For athletes the appeal is obvious and well earned: it works, it is cheap, and it is safe. The longevity interest comes from a different angle. Holding onto muscle as you age is one of the most reliable predictors of staying strong, mobile, and independent. Creatine is one of the few supplements that genuinely helps with that when combined with resistance training. The brain-health angle is newer and has added a wave of fresh interest.

What does the science actually say about Creatine?

Creatine is the rare supplement where the evidence is genuinely strong. Hundreds of human trials and many meta-analyses show that creatine, combined with resistance training, reliably supports gains in strength and lean muscle. This is not a marginal or disputed effect. It is one of the best-established findings in sports science. For maintaining muscle in older adults who also train, the support is solid.

The bone angle is promising: in older women, creatine combined with resistance training has been associated with better bone measures than training alone in several studies, though more work is ongoing.

The brain story is the newest and the most “promising” rather than “proven.” Your brain uses creatine for energy too, and some human studies suggest supplementation may support memory and thinking, with the clearest signals appearing when the brain is stressed, during sleep deprivation or in older adults. The effects are modest and the research is still developing, but the direction is encouraging and the mechanism is sound.

Crucially, creatine’s safety has been studied extensively, including long-term use, and it holds up well. That combination of strong benefit and strong safety is uncommon.

How do people use Creatine?

The standard approach is 3 to 5 grams of creatine monohydrate per day, every day, taken at any time. Some people start with a short “loading” phase of around 20 grams a day split into four doses for five to seven days to fill stores faster, but loading is optional, steady daily use gets you to the same place. Plain monohydrate is the well-studied, inexpensive form; fancier versions offer no proven advantage.

Is Creatine safe? Risks and who should skip it

Creatine is one of the safest supplements available for healthy people. The main side effect is a small amount of water weight early on. It is not the kidney risk it was once rumored to be in healthy individuals, but anyone with existing kidney disease should check with a doctor first. Staying well hydrated is sensible. If you are pregnant, breastfeeding, or managing a medical condition, confirm with your clinician.

The bottom line on Creatine

Creatine is arguably the best evidence-to-cost ratio in this entire book: cheap, safe, and genuinely effective for muscle and strength when you train. The emerging brain and bone benefits are a bonus on top of an already strong case.