Creatine After 40: What the Research Actually Says

Mention creatine to most people over 40 and you’ll get one of two reactions: either they think it’s a steroid, or they think it’s just for twenty-something bodybuilders trying to get bigger biceps. Neither is true, and if you’re not taking it, you’re likely missing one of the simplest, most researched supplements available for people our age.

What creatine actually does

Creatine is a compound your body already makes and stores in muscle, where it helps produce quick energy during effort: lifting, sprinting, climbing stairs, getting up off the floor. Supplementing with it simply tops up those stores beyond what your diet alone provides, giving your muscles a bit more fuel to work with.

It’s one of the most studied supplements in sports science, with decades of safety data behind it. This isn’t a trend. It’s one of the few supplements with genuinely strong evidence behind it.

Why it matters more after 40, not less

This is where it gets interesting. Most of the marketing around creatine targets young gym-goers, but the research increasingly points to older adults as the group who may benefit most:

• Muscle maintenance. As we age, we naturally become less efficient at building and holding onto muscle. Creatine has been shown to improve the muscle gains from strength training in older adults specifically, on top of what training alone achieves.
• Bone health. Emerging research links creatine supplementation, combined with resistance training, to improvements in bone density, relevant for anyone thinking about long-term joint and bone health, especially post-menopause.
• Brain health. This is the newer, less talked-about area. Several studies suggest creatine may support cognitive function, particularly under physical or mental fatigue, useful for anyone juggling a demanding job, bad sleep, and training.

Addressing the myths

• “It’ll make me bulky.” No. Creatine helps you get more out of your training, it doesn’t change your physique on its own. You’d need to be lifting heavy and eating in surplus to add significant size, which isn’t what most people over 40 are doing.
• “It’s bad for your kidneys.” This myth persists despite being thoroughly debunked in healthy adults. The original concern came from studies in people with existing kidney disease. If you have a pre-existing kidney condition, check with your doctor first, but for the average healthy adult, it’s considered one of the safest supplements available.
• “You need to ‘load’ it.” Not necessary. A loading phase just gets you to saturation faster; a steady daily dose gets you to the same place within about 3-4 weeks.

How to actually take it

Keep it simple: 3-5g of plain creatine monohydrate per day, any time of day, with or without food. Consistency matters more than timing. No need for fancy blends or “advanced” formulas. Monohydrate is the most researched form and the one that actually works.

The bottom line

Creatine isn’t about chasing bigger muscles. For people over 40, it’s a low-cost, well-researched way to support the training you’re already doing, protect muscle and possibly bone as you age, and potentially give your brain a bit more resilience too. It’s one of the few supplements I’d genuinely call worth taking.

Neil McGuigan is a personal trainer with 18+ years of coaching behind him and a background representing Ireland in international athletics, working with men and women over 40 across UNTIL Soho, Marylebone, Liverpool Street, and Canary Wharf.