CREATINE 101
CLASS IS IN
SESSION
Not a stimulant. Not a steroid. Creatine fuels your body’s cellular batteries, which can run flat when you’re pushing hard. Here’s the biochemistry, the data, and the honest limits of what creatine does.
WHAT IS CREATINE?
A molecule you already make, already eat, and already use.
Creatine is a natural substance. Your liver, kidneys and pancreas produce it by synthesizing protein building blocks (AKA amino acids.) You also get it from meat and fish, namely beef, pork and salmon.
Almost all of this creatine – about 95% – gets stored in your muscles. Most of it sits there in a “loaded” form called phosphocreatine, which just means creatine holding onto a spare part it can hand over the instant your muscle needs it.
Your body uses up and then replaces approximately 1–2 g of creatine every day. About half of that is replenished via food and your body produces the other half. This 1-2 g is enough to keep your muscles partly stocked but not full. If you don’t eat meat, you’re starting even lower, because plants contain almost no creatine. Taking creatine isn’t putting something foreign in your body, it’s filling up a tank that’s normally sitting around two-thirds full.
Data from the ISSN (International Society of Sports Nutrition).
You’re constantly using creatine and topping it back up from two sources: your dinner, and your own body. A supplement doesn’t replace either one, it adds on top, and that’s the only way your muscle stores get past their usual level.
HOW DOES CREATINE WORK?
Your muscles hold about 10 seconds of fuel. Creatine buys more.
Muscles don’t run on food directly, they’re fueled by a molecule called ATP (adenosine triphosphate). Think of ATP like your cellular batteries. Every time a muscle contracts, it drains one of these batteries.
Here’s the catch: your muscles only hold about two seconds of “charged batteries” at a time. The limiting factor isn’t how many of these charged molecules you have, it’s how fast you can recharge them after they’ve been spent. That’s creatine’s job: recharging spent molecules back into “ready-to-go batteries”, or ATP.
ATP
Charged - Ready to contract
CREATINE
Receives Pi
ADP
Spent - Needs a phosphate back
PHOSPHO-CREATINE
Donates Pi
YOU LIFT, THEN YOUR BATTERY GOES FLAT
Your muscle uses up its fuel molecule (ATP) to power the movement. That molecule is now spent, it's lost a small piece of itself (a phosphate) and can't be used again until it gets one back.
CREATINE RECHARGES YOUR MUSCLES
Stored creatine is holding a spare phosphate. It passes that spare over to the spent molecule, which instantly recharges it. This happens in a fraction of a second. No oxygen needed, no waiting around.
PHOSPHOCREATINE RESERVES DRAIN OUT
Every time creatine gives a phosphate away, it has one fewer to give. Under all-out effort, your creatine store is the thing that runs out... and it's gone in roughly 10 seconds. That's the moment your set falls apart.
YOU REST & THE RESERVE FILLS BACK UP
Between sets, the whole process runs in reverse and your creatine picks up fresh phosphates, ready for the next round.
MORE CREATINE STORED = A BIGGER RESERVE
That's the entire point of supplementing. More creatine in the muscle means more recharges available during a set + faster refill between sets.
WHAT DOES CREATINE DO INSIDE YOUR BODY?
Building your creatine stockpile.
Creatine isn’t like caffeine where you feel the change immediately, because the effect isn’t pharmacological. Supplementing with creatine is the act of filling your reserve overtime.
Once ingested, creatine is absorbed and pulled into muscle cells by a sodium-dependent transporter. The cells fill toward a ceiling: past a certain point, stores saturate and any excess is simply excreted in urine as creatinine. You cannot force muscle beyond saturation. This is why taking “too much” creatine is not a major concern.
“Loading” means taking a big dose (around 20 g a day) for under a week to fill your muscles fast. Taking a small steady dose (around 3 g a day) gets you to exactly the same place, it just takes about a month. You don’t have to load. Just know that if you skip it, week two isn’t the moment to decide creatine “doesn’t work.”
WHY THE SCALE GOES UP QUICKLY
Creatine is osmotically active: it pulls water into the muscle cell with it. Most people see 1–2 kg appear on the scale in the first week or two. That water is intracellular, meaning inside the muscle, not under the skin. The evidence does not support creatine causing a fat gain or a “puffy” look. It also means the first bit of “muscle gain” you see is genuinely fluid. The tissue comes later, and only if you train.
WHAT IT DOES TO YOUR BLOODWORK
Creatine breaks down into creatinine, the same marker labs use to estimate kidney function. So supplementing can nudge serum creatinine levels upward without anything being wrong with your kidneys. A systematic review and meta-analysis of creatine and renal function concluded that supplementation does not induce kidney damage at the doses and durations studied. It’s worth telling your doctor you take creatine before anyone reads too much into a single number.
WHAT RESEARCH SHOWS
THE EFFECTS ARE REAL, BUT THEY’RE NOT AS CRAZY AS THE INTERNET CLAIMS
Creatine has been studied for more than three decades across hundreds of controlled trials, which is exactly why it’s worth being precise about what it does and doesn’t deliver. The honest summary: the effects are real, replicated and noticeable, but they are moderate. Anyone selling you a complete crazy transformation is selling you something else.
Extra lean tissue vs. placebo
Older adults participating in resistance training with creatine.
Effect size for high-intensity bursts
Sprints, jumps, heavy lifts.
Memory improvement vs. placebo
In adults, across all studies.
STRENGTH AND POWER IN SHORT EFFORTS
One researcher gathered 100 separate creatine studies and combined their results (meta-analysis) then sorted the results by how long each effort lasted. The pattern matched the biology exactly: the shorter and harder the effort, the more creatine helped.
All four benefits are observed, meaning they’re very unlikely to be down to luck, and all four are small. The order matters: the shortest, most explosive efforts benefit the most (0.24), which is exactly what you’d expect from a molecule that recharges your muscles’ short-term battery. He also found the effect showed up more clearly in gym-style tests than in running or swimming.
MUSCLE AND STRENGTH – ESPECIALLY AS YOU GET OLDER
The most useful evidence is in older adults, where losing muscle is more than a vanity issue, it’s the difference between getting up off the floor and not. One team combined 22 studies covering 721 men and women, average age 57 to 70. Everyone lifted weights 2–3 times a week for somewhere between 7 weeks and a full year. Half took creatine, half took a dummy pill (placebo).
None of these lines touch zero, which is the researchers’ way of saying: this benefit is very unlikely to be a fluke. In the same set of studies, the creatine group also ended up with 1.37 kg (about 3 lb) more muscle than the placebo group. One thing to be clear about: this is creatine plus lifting weights. Creatine amplifies work you’re already doing. It doesn’t replace it.
YOUR BRAIN
This is the newest and most exciting area, and the one where the hype has run furthest ahead of the evidence. Your brain uses the same recharge system your muscles do, and it’s an energy-hungry organ.
A 2024 review that pooled the available studies found creatine gave a small but real boost to memory. An earlier review of studies in healthy people came to a similar conclusion, with the biggest results being documented as supporting those doing mentally demanding tasks. The benefit was most clearly demonstrated in people who were stressed, short on sleep, or didn’t eat much meat. The science is promising, but still developing.
WHERE TO START?
3-5 GRAMS.
EVERY DAY.
THAT’S GENUINELY THE WHOLE THING.
REPETITION.
REPETITION.
REPETITION.
99.98% pure creatine monohydrate, third-party tested, made for Canadians, with a Natural Product Number (NPN) on the label.
THE RECEIPTS
EVERY CLAIM ON THIS PAGE CAME FROM PEER-REVIEWED STUDIES.
These are all published scientific papers that other scientists have checked over before publication. The links go straight to the originals, not to someone’s summary of them. If we’ve got something wrong, we want to hear about it.
- Kreider RB, Kalman DS, Antonio J, et al. International Society of Sports Nutrition position stand: safety and efficacy of creatine supplementation in exercise, sport, and medicine. J Int Soc Sports Nutr. 2017;14:18. doi:10.1186/s12970-017-0173-z
- Branch JD. Effect of creatine supplementation on body composition and performance: a meta-analysis. Int J Sport Nutr Exerc Metab. 2003;13(2):198–226. doi:10.1123/ijsnem.13.2.198
- Chilibeck PD, Kaviani M, Candow DG, Zello GA. Effect of creatine supplementation during resistance training on lean tissue mass and muscular strength in older adults: a meta-analysis. Open Access J Sports Med. 2017;8:213–226. doi:10.2147/OAJSM.S123529
- Xu C, Bi S, Zhang W, Luo L. The effects of creatine supplementation on cognitive function in adults: a systematic review and meta-analysis. Front Nutr. 2024;11:1424972. doi:10.3389/fnut.2024.1424972
- de Souza e Silva A, Pertille A, Reis Barbosa CG, et al. Effects of creatine supplementation on renal function: a systematic review and meta-analysis. J Ren Nutr. 2019;29(6):480–489. doi:10.1053/j.jrn.2019.05.004
- Antonio J, Candow DG, Forbes SC, et al. Common questions and misconceptions about creatine supplementation: what does the scientific evidence really show? J Int Soc Sports Nutr. 2021;18(1):13. doi:10.1186/s12970-021-00412-w
- Avgerinos KI, Spyrou N, Bougioukas KI, Kapogiannis D. Effects of creatine supplementation on cognitive function of healthy individuals: a systematic review of randomized controlled trials. Exp Gerontol. 2018;108:166–173. doi:10.1016/j.exger.2018.04.013
- Lak M, et al. Does creatine cause hair loss? A 12-week randomized controlled trial. J Int Soc Sports Nutr. 2025;22(sup1):2495229. doi:10.1080/15502783.2025.2495229
DISCLAIMER
This page is here to explain things, not to give you medical advice. Creatine monohydrate is licensed in Canada as a Natural Health Product. Always read and follow the label. Check with a doctor or pharmacist before starting any supplement, especially if you’re pregnant, breastfeeding, under 18, or have any kidney or liver condition.