What Your Supplement Label Is Actually Promising & What the Science Says About Creatine

Pick up almost any creatine product and read the label. You will find words like "supports peak performance," "enhances cognitive function," "builds lean muscle," and if the marketing team was particularly inspired that morning, something about "unlocking your potential."

Bold claims. Great font. Very confident energy.

Some of it is true. Some of it is true only under very specific conditions. And some of it is the supplement equivalent of saying your car "supports high-speed travel" without mentioning it needs fuel.

This is not a creatine problem specifically. Creatine is actually one of the most studied compounds in sports nutrition — decades of research, thousands of participants, replicated across countries and age groups. If anything, creatine deserves better than the labels it usually ends up on.

This is a label claims problem. And creatine makes a perfect case study precisely because the science is so solid. When the evidence is this good and the gap between what studies show and what labels say is still this wide, it tells you something important about how the industry approaches claims more broadly.

What a Health Claim Is Actually Supposed to Mean

In Canada, every natural health product needs a Natural Product Number from Health Canada before it can be sold. Part of that process involves submitting evidence to support the claims on the label. The system exists to protect consumers from products that promise outcomes the science does not back up.

In principle, reassuring. In practice, there is a gap.

A claim can be technically compliant with the NHP framework while still implying something the evidence does not fully deliver for the average person reading it. The letter of the claim and the spirit of what a consumer hears are not always the same sentence. And supplement brands are very good at writing the former while banking on the latter.

Creatine illustrates this perfectly.

The Muscle Claim — Mostly True, But the Asterisk Is Doing Heavy Lifting

"Supports muscle strength and power." That claim has a genuinely strong evidence base. A 2025 meta-analysis in Nutrients reviewed randomized controlled trials on both upper and lower body strength and confirmed what the research has been saying for years — creatine combined with resistance training improves muscle strength and power output (3).

The key word in that sentence is combined.

Creatine does not build muscle on its own. What it does is help your muscles produce energy more quickly during short, intense effort — like a turbo boost for the moments when you are working hard (1, 2). If no training is happening, there is nothing for the turbo boost to turbo. A person taking creatine while spending their evenings on the sofa will not gain muscle. They will just be a very well-supplemented person on a sofa.

This is one of the most consistently documented findings in the creatine literature and one of the most consistently absent details on creatine labels. "Supports muscle strength and power" sounds unconditional. The evidence is considerably more conditional.

The Cognitive Claim — Promising, But Proceed With Appropriate Skepticism

This is the area where creatine marketing has grown fastest recently, and where the gap between claim and evidence is hardest to miss if you are paying attention.

Here is what the research actually shows. Creatine does reach the brain. Brain tissue has its own creatine stores, and those stores can dip under conditions of metabolic stress — sleep deprivation, heavy cognitive load, or the gradual changes that come with aging. Research suggests creatine may have a more significant effect on cognition in older, diseased, and stressed individuals than in younger, unstressed ones.

That is a real and meaningful finding. The problem is that "creatine for stressed older adults with low dietary intake" is not what ends up on the label. What ends up on the label is "enhances cognitive function." For everyone. No asterisk.

The biological reality is more complicated. A key uncertainty is whether supplemented creatine crosses the blood-brain barrier in sufficient amounts to affect neuronal metabolism, and the absence of standardized protocols makes firm conclusions difficult. Individual variability is high. The research is still working out who benefits, at what dose, and how long they need to supplement before anything measurable happens.

A cognitive health claim on a general population product is currently running well ahead of the evidence. The honest version of that claim is narrower and more specific. Narrower and more specific are, unfortunately, harder to put on a label in a compelling way.

Who the Evidence Actually Supports — And Why It Matters

Here is where it gets genuinely interesting for anyone building a product in this space. The populations with the strongest creatine evidence base are not always the ones being marketed to most aggressively.

Older adults are the clearest case. Research shows that creatine monohydrate, primarily when combined with exercise training, has beneficial effects on lean body mass, muscle strength, functional ability, and cognitive outcomes in older adults. There is also a dietary angle that almost never shows up in marketing materials: 70% of adults over 65 consume less creatine than recommended from their diet, and low dietary creatine intake is associated with poorer cognitive function.

Red meat and fish are the main food sources of creatine. If someone is eating less of those — by choice, by circumstance, or because they are 75 and their appetite has changed — their baseline creatine levels are lower than average and supplementation has considerably more room to make a real difference. A product designed for this population, with claims built around this evidence, is both scientifically defensible and genuinely useful.

Vegans and vegetarians sit in a similar position. For vegans and vegetarians, who often have reduced creatine stores due to the absence of creatine-rich animal products in their diet, supplementation can improve both physical and cognitive performance. This is one of the cleaner use cases in the entire creatine literature — a genuine physiological rationale, a growing consumer segment, and claims that hold up to scrutiny.

Women across different life stages are a third population where the evidence is growing but has historically been overlooked. Women exhibit distinct physiological differences influenced by hormonal fluctuations during pre-menopause, pregnancy, and menopause that influence creatine metabolism and effectiveness. Most of the foundational creatine research was conducted on young men in gym settings. The populations that may benefit most from creatine are often the least represented in the studies that everyone cites. That gap is starting to close but the confidence levels for specific claims in these groups are still lower than for the core athletic population — which means the claims need to reflect that honestly.

Why This Matters Beyond the Regulatory Checklist

A label claim is a promise. The person reading it is making a real decision — about their health, their money, and what they can reasonably expect.

When a claim implies a broad population benefit based on evidence that applies to a specific sub-group, it is not just a compliance issue. It is a trust issue. Consumers who buy a creatine product expecting cognitive enhancement and do not experience it do not think "perhaps the claim was overstated for my demographic." They think "supplements do not work." That conclusion is bad for them and bad for every brand in the category building products with genuine evidence behind them.

The irony is that creatine has a strong enough evidence base to make genuinely compelling, accurate claims. Older adults and low-intake populations seeing real improvements in strength and function. Vegans with a clear physiological rationale for supplementation. Women navigating hormonal transitions with emerging evidence behind them. These are real stories built on real research.

"Creatine supports muscle strength and functional capacity in older adults engaged in resistance training" is a harder sell than "supports peak performance." But it is what the evidence actually says. And in a market where consumers are increasingly skeptical, the brands that say what they mean tend to be the ones that are still around to say anything at all.

References

1. Kreider, R. B., and Stout, J. R. (2021). Creatine in health and disease. Nutrients, 13(2), 447. https://doi.org/10.3390/nu13020447

2. Wax, B., Kerksick, C. M., Jagim, A. R., Mayo, J. J., Lyons, B. C., and Kreider, R. B. (2021). Creatine for exercise and sports performance, with recovery considerations for healthy populations. Nutrients, 13(6), 1915. https://doi.org/10.3390/nu13061915

3. Lozano-Casanova, M. et al. (2025). The effects of creatine supplementation on upper and lower body strength and power: a systematic review and meta-analysis. Nutrients, 17(17), 2748. https://doi.org/10.3390/nu17172748

4. Candow, D. G. et al. (2025). Creatine monohydrate supplementation for older adults and clinical populations. Journal of the International Society of Sports Nutrition, 22(1). https://doi.org/10.1080/15502783.2025.2534130

5. Li, N. (2026). Creatine supplementation and exercise in aging: a narrative review of the muscle-brain axis. Frontiers in Nutrition, 12. https://doi.org/10.3389/fnut.2025.1687719

6. Smith-Ryan, A. E. et al. (2025). Creatine in women's health: bridging the gap from menstruation through pregnancy to menopause. Journal of the International Society of Sports Nutrition, 22(1). https://doi.org/10.1080/15502783.2025.2502094

7. Gutiérrez-Hellín, J. et al. (2024). Creatine supplementation beyond athletics: benefits for women, vegans, and clinical populations. Nutrients, 17(1), 95. https://doi.org/10.3390/nu17010095

8. Forbes, S. C. et al. (2025). Creatine and cognition in aging: a systematic review. Nutrition Reviews. https://doi.org/10.1093/nutrit/nuaf135

9. Machado, M. (2025). Creatine supplementation and cognitive aging: the challenge of crossing the blood-brain barrier. Nutrition, 130. https://doi.org/10.1177/02601060251404327

10. Smith-Ryan, A. E. et al. (2021). Creatine supplementation in women's health: a lifespan perspective. Nutrients, 13(3), 877. https://doi.org/10.3390/nu13030877