Taking creatine near a workout probably matters less than the supplement aisle suggests. A 2022 review by Scott Forbes and colleagues concluded that nobody yet knows whether the timing of creatine changes the gains it brings. The reasons people give for dosing close to a workout are, in the review’s words, currently only hypothetical.
What is not in doubt is the headline effect. The same review notes that creatine taken during a resistance training programme has consistently beaten training alone on muscle mass and strength.
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Where creatine comes from
Your body makes and stores it without any help. Cleveland Clinic says about half your supply, 1 to 2 grams a day, comes from food such as red meat, fish, shellfish and milk. The liver, kidneys and pancreas make the other half, and about 95 per cent of it goes to the skeletal muscles.
Inside a muscle it becomes phosphocreatine, which helps the cell make ATP, the fuel it burns during a hard lift or a sprint. A supplement raises the amount held in the muscle. The most common form on sale is creatine monohydrate.
The case for taking it near a workout
The argument rests on blood flow. Exercise can raise the flow of blood to a working muscle up to 100-fold from rest, according to the Forbes review. More blood through the muscle might carry more creatine into it, through the transporter muscle cells use to take it up.
The timing is where the idea gets awkward. A dose of about 5 grams usually peaks in the blood within two hours and stays raised for around four. Blood flow, by contrast, usually returns to resting levels within 30 minutes of the end of a session. Lining the two up is harder than it sounds, and the review notes that exercise type, volume and intensity all change how big and how long the blood flow boost is.
Food is the other lever. Taking creatine with carbohydrate, or carbohydrate and protein, appears to raise how much the muscle stores. The review links that to insulin rather than to the clock. Its authors frame the whole question as one for future research, not a settled rule.
What dietitians tell people to do
Show up every day. Kylene Bogden, sports performance dietitian for the Cleveland Cavaliers, told Men’s Health that missing doses matters far more than the hour you take them. Regular intake, she said, is what builds up the muscle stores.
Robert Iafelice, a dietitian quoted in the same piece, calls the timing a personal choice. He does think muscle cells are keener to take up creatine after exercise, which he sees as a slight edge for a post-workout dose.
The stores also fade slowly. Cleveland Clinic says that once you stop, creatine levels drift down over the following few weeks. Your body keeps making its own supply in the meantime, though some people lose muscle mass as levels fall. Regular training should hold on to the strength already gained, but further progress is less likely. That slow build and slow fade is why one missed morning, or one dose taken at night instead, is unlikely to show.
Who should check first
Cleveland Clinic says studies find creatine safe for many people. It adds that the evidence is too thin to say the same during pregnancy or breastfeeding, or with kidney or liver disease. It also flags a possible raised risk of mania for people with bipolar disorder.
Athletes need not worry about the rules. The International Olympic Committee and the NCAA both allow creatine. Vegetarians and vegans may see bigger gains than meat eaters, because their diet supplies less of it to begin with.
