Creatine has spent 30 years being sold to athletes and gym bros. It stares at you from the sports nutrition aisle next to pre-workout powders and protein tubs, packaged in containers with names like “Extreme Mass Builder” or “Peak Performance Pro.” Your doctor has almost certainly never mentioned it. Your 40-year-old self walks past it assuming none of it applies to you.

The evidence has been quietly disagreeing with that assumption for three decades.

And the evidence is not subtle. It is one of the most researched supplements in existence. Thousands of studies. Consistent findings across decades. A safety profile so well-established that Harvard Health, multiple systematic reviews, and the International Society of Sports Nutrition all agree: it is safe, it is effective, and it is dramatically underused by the population that needs it most.

Let’s run it through the filter.

Here is something most people do not know: you start losing muscle mass after age 30, and the decline accelerates sharply after 50. After your fifth decade, muscle mass drops 1 to 2 percent per year. Strength falls even faster, 1.5 to 5 percent annually. By your seventies, this process, called sarcopenia, affects roughly 10 to 22 percent of all adults, and it is directly linked to falls, fractures, loss of independence, cardiovascular disease, and accelerated mortality.

This is not a vanity issue. Muscle mass in older adults is one of the strongest predictors of healthspan outcomes. Losing it is not inevitable, but it is the default if you do nothing.

Here is the second thing most people do not know: your natural creatine levels also decline with age. A 2025 analysis of 1,500 adults over 65 found that 70 percent consumed less than the recommended daily amount of creatine from their diet alone. Low dietary creatine intake in this group was associated with greater risk of angina pectoris and liver conditions.

The population that needs creatine the most is the population least likely to be taking it.

Yes, unusually strongly for a supplement.

Multiple meta-analyses of randomized controlled trials, involving thousands of participants across decades of research, have found consistent results:

MUSCLE STRENGTH AND LEAN MASS: Strong, consistent evidence Creatine combined with resistance training increases lean mass by approximately 3 lbs. (1.37 kg) more than resistance training alone. Multiple meta-analyses confirm significant improvements in upper and lower body strength. Effect sizes are classified as small to moderate, meaningful for outcomes that compound over years.

SARCOPENIA PREVENTION: Accumulating strong evidence Creatine supplementation (3+ g/day) combined with resistance training is a viable, well-supported intervention for preserving muscle strength, whole-body lean mass, and functional capacity in older adults. The 2025 comprehensive review by Candow et al., one of the most thorough in the field, confirms this across multiple outcome measures.

BONE HEALTH AND FALLS PREVENTION: Preliminary but directionally positive Creatine supplementation during resistance training programs shows some potential to improve bone mineral density and reduce fall risk. The evidence is not as consistent as the muscle findings, but the direction is positive and the mechanism is plausible.

COGNITIVE FUNCTION: Real, dose-dependent, and more specific than most people realize This is where it gets genuinely interesting, and where most creatine articles get the nuance wrong.

The brain uses creatine for energy metabolism, and aging brains have lower creatine stores. A 2024 meta-analysis found that creatine supplementation significantly improved memory (SMD = 0.31, p < 0.0001). But the cognitive benefits are not uniform, they are conditional:

One important caveat: creatine needs a specialized transporter to cross the blood-brain barrier, and that transporter appears to work near saturation under normal conditions. Even at 20g/day, brain creatine increases by only about 10%, while muscle creatine increases by 20% at just 5g/day. Recent reviews have flagged this as a key uncertainty. The cognitive evidence is real, but it is more conditional and dose-dependent than the muscle evidence.

SAFETY: Exceptionally well established A 2021 review of over 500 studies confirmed creatine is safe for individuals of any age at recommended doses. No adverse effects on kidney or liver function have been found in healthy adults across decades of research. Harvard Health, the International Society of Sports Nutrition, and multiple clinical reviews agree: it is one of the safest supplements ever studied.

This is where the MED Report filter does its most important work.

Creatine monohydrate powder, the plain, unglamorous version that the evidence actually supports, costs approximately $15 for three months. The dose is 3 to 5 grams per day. No loading phase is required for muscle benefits, though a loading phase of 20g/day for 5 to 7 days may accelerate and enhance cognitive benefits. No cycling required. No special timing required.

The ROI of this supplement compared to almost anything else in the healthspan space is almost unmatched. A $15 investment over three months, combined with any form of resistance training, produces meaningful improvements in the two outcomes that decline fastest with aging: muscle mass and cognitive function.

For comparison: the average American over 50 spends over $100 per month on supplements. Most of those supplements have a fraction of the evidence base that creatine has. Creatine sits in the sports nutrition aisle and nobody is marketing it aggressively to the 50 to 70 demographic because there is no money in a $15 commodity.

That is exactly why it belongs in this newsletter.

This recommendation is specifically for otherwise healthy adults with no known kidney disease, no existing kidney conditions, and no pre-existing conditions affecting creatine metabolism.

Two things worth flagging:

One other minor note: some people experience temporary water retention in the first week of creatine supplementation. This is intracellular, inside muscle cells, not visible bloating. It resolves and is not a health concern.

Creatine is the supplement industry’s most inconvenient product. It costs almost nothing. It requires no proprietary formula. It has been off-patent for decades. It cannot be meaningfully differentiated from competitors. There is no business case for a multi-million dollar marketing campaign aimed at the 40-plus demographic.

So instead, it sits in the sports nutrition aisle next to $80 testosterone boosters with no clinical evidence, $60 nootropic stacks with two studies behind them, and $120 “longevity formulas” built on mechanistic speculation.

Meanwhile, the supplement with the deepest evidence base for the two outcomes that matter most as you age, muscle preservation and cognitive function, quietly costs $15 for three months.

 The system rewards novelty and complexity. Creatine is the opposite of both. That is exactly why most people over 40 are not taking it.

Take it! Probably the strongest single supplement Signal for the 40-70 demographic who are otherwise healthy with no known deficiencies or conditions.  The evidence base for muscle preservation alone is deeper and more consistent than virtually any other supplement targeting healthspan outcomes. The cognitive evidence, while more conditional, adds a second meaningful outcome domain.

FOR MUSCLE AND SARCOPENIA PREVENTION (primary benefit):

• 3 to 5 grams of creatine monohydrate per day
• No loading phase required
• Take anytime with a meal, coffee, water or anything else
• Combine with any resistance training, even bodyweight exercises count
• Continue indefinitely, benefits are maintained with consistent use

FOR COGNITIVE BENEFITS (secondary, dose-dependent):

• Loading phase: 20 grams per day for 5 to 7 days
• Maintenance: 5 grams per day ongoing
• Most beneficial if you are over 60, eat little red meat, or experience cognitive fatigue

In both cases: buy plain creatine monohydrate powder. Not creatine HCl. Not creatine ethyl ester. Not any proprietary blend. The monohydrate form is what the evidence supports, and it is the cheapest version available. Any brand that sells pure creatine monohydrate works. The molecule does not care about the label.

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SOURCES

1.     Candow DG et al. (2025), Creatine monohydrate supplementation for older adults and clinical populations. Journal of the International Society of Sports Nutrition. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12272710/

2.     Li N. (2026), Creatine supplementation and exercise in aging: a narrative review of the muscle–brain axis. Frontiers in Nutrition. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12832544/

3.     Xu C et al. (2024), The effects of creatine supplementation on cognitive function in adults: a systematic review and meta-analysis. Frontiers in Nutrition. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11275561/

4.     Marshall S et al. (2025), Creatine and Cognition in Aging: A Systematic Review of Evidence in Older Adults. Nutrition Reviews. https://academic.oup.com/nutritionreviews/advance-article/doi/10.1093/nutrit/nuaf135/8253584

5.     McMorris T et al. (2007), Creatine supplementation and cognitive performance in elderly individuals. Aging Neuropsychol Cogn. https://pubmed.ncbi.nlm.nih.gov/17828627/

6.    Chilibeck PD, Kaviani M, Candow DG & Zello GA (2017), Effect of creatine supplementation during resistance training on lean tissue mass and muscular strength in older adults: a meta-analysis. Open Access Journal of Sports Medicine. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5679696/

7.     Candow DG et al. (2022), Creatine supplementation for older adults: Focus on sarcopenia, osteoporosis, frailty and cachexia. Bone. https://pubmed.ncbi.nlm.nih.gov/35688360/

8.     Harvard Health Publishing (2024), What is creatine? Potential benefits and risks. https://www.health.harvard.edu/exercise-and-fitness/what-is-creatine-potential-benefits-and-risks-of-this-popular-supplement