Creatine doesn't usually produce an obvious effect after your first scoop.

It works by gradually increasing creatine stored in your muscles.

How quickly that happens depends mainly on whether you use a loading phase.

With a loading phase

A conventional loading protocol is approximately:

20 g per day for 5 to 7 days, divided into several smaller servings.

That can raise muscle creatine stores relatively quickly. After loading, users typically move to a maintenance intake of 3 to 5 g per day. NIH Office of Dietary Supplements

If speed matters, a tub of creatine monohydrate powder makes divided doses relatively simple.

Without loading

If you start with 3 to 5 g per day, saturation happens more gradually.

NIH guidance describes lower daily-dose protocols taken over roughly 3 to 4 weeks as another established approach. NIH Office of Dietary Supplements

There is nothing wrong with this method.

For someone planning to take creatine long term, it's arguably easier.

When will you notice a difference?

Not everyone experiences an obvious sensation when creatine starts working.

You might notice:

  • Slightly better performance across repeated hard sets
  • An extra repetition at a given weight
  • Better maintenance of power
  • A modest increase in body weight
  • Fuller-looking muscles from increased intracellular water

These changes can be subtle.

Creatine is better judged over weeks of training than from how you feel during one workout.

What if nothing happens?

Individual responses vary.

Your diet, initial muscle creatine levels and training style can influence the size of the effect.

Creatine is particularly useful for repeated high-intensity activity. If your exercise is almost entirely low-intensity endurance work, the benefits may be harder to notice. NIH Office of Dietary Supplements

Bottom line

With loading, creatine stores can rise substantially within about a week.

Without loading, expect the process to take several weeks.

Either method works. The important part is consistently taking an effective dose of creatine monohydrate.