Do You Take Creatine on Rest Days? What the Research Shows

Yes, creatine is normally taken on rest days too. It works through a store of creatine in your muscles that needs topping up every day whether you train or not, and the research on creatine describes daily intake, rest days included.

Why rest days count

Creatine supplements work by raising the amount of creatine stored in your muscles, and that store is what you draw on during training. The ISSN position stand says a normal diet leaves muscle creatine about 60 to 80% saturated and that supplementing raises it by 20 to 40%. Once stores are full, it describes keeping them there with a daily amount (Kreider et al., 2017).

The same paper explains why the top-up is daily: about 1 to 2% of muscle creatine is broken down into creatinine and passed in urine, and the body has to replace it each day. That loss happens on rest days as well.

A 1996 study showed both sides of this. After a short loading phase, men who kept taking a small daily amount held their raised levels for another 30 days. Men who stopped saw their levels drift down until, 30 days later, they were back where they started (Hultman et al., 1996).

What the studies did on non-training days

It helps to look at what the studies did. In the 2013 study that compared taking creatine before or after workouts, participants trained five days a week and took creatine "on the two non-training days at their convenience" (Antonio & Ciccone, 2013).

That detail answers the question better than any opinion. The protocols in the ISSN position stand are also written per day, not per workout. If you only take creatine on gym days, you're doing something different from what was tested.

Does creatine get into muscle if you don't train?

Yes. Some of the earliest creatine studies didn't involve any training program. A 2025 review by a group of creatine researchers notes that the 1992 and 1996 studies by Harris and Hultman raised the total creatine pool in muscle with supplementation alone (Antonio et al., 2025).

The same review says muscle contraction has been shown to boost creatine uptake in the short term, and that whether this matters for long-term storage is unknown. So training may help uptake a little on the day you train, but creatine still reaches your muscles on the days you don't.

When to take it on a rest day

On a training day, people often take creatine before or after the session. On a rest day there's no session, and that's where the timing question usually comes from.

The research on timing doesn't point to a best hour. Studies comparing before and after training found similar results, and the reviewers concluded that consistent intake is likely the most important variable (see creatine before or after a workout). On a rest day, pick a time you will repeat. The easiest option is usually the same time you use on training days, or something you do every day anyway, like breakfast.

If you take creatine in a post-workout shake, you'll need another way to take it on rest days. The ISSN position stand says taking creatine with carbohydrate, or carbohydrate and protein, appears to increase muscle uptake, though the effect on performance may not be greater than creatine on its own (Kreider et al., 2017). So a meal works as well as anything, and water or juice is fine too. As for the amount, the 2013 study used the same supplement on rest days as on training days. Stick with the amount you already take.

Why rest days are when people forget

This is why the question matters in practice. Creatine gives you no feedback, so you take it when something reminds you. For a lot of people that reminder is the gym: the post-workout shake, the gym bag, the locker. On rest days none of it happens.

Habit research explains why. In a study of 96 people building a new daily habit, repeating the behaviour in the same context is what made it automatic over time (Lally et al., 2010). A cue that only exists four days a week builds a four-day habit. If you want seven days, the cue has to happen seven days a week. In that study, the time people took to reach their peak automaticity ranged from 18 to 254 days, so a weekday-only cue has a lot of ground to cover.

If your creatine habit only exists on gym days

Creatinely reminds you at the same time every day, rest days included, and a widget on your home screen shows whether today is done. (I make Creatinely.)

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What happens if you skip rest days anyway

A single skipped rest day isn't a problem. Muscle stores fall slowly, which is covered in more detail in what happens if you miss a day of creatine.

Skipping every rest day is a different pattern: two or three gaps a week, every week. I couldn't find a study that compared a training-days-only schedule with daily intake, so I can't tell you what it costs in numbers. What the research does show is that the timing study above kept going on rest days, and that consistent intake is what the reviewers point to.

One side effect of taking it every day is that the tub runs out sooner than if you only take it on gym days. The creatine tub calculator tells you the date it will be empty, so you can order the next one before you hit a gap.

Treat rest days like any other day: same amount you already take, same time, no thinking required.