It depends on how you start. Creatine works by building up the creatine stored in your muscles, and the benefits show once those stores are full. There are two ways to get there.
With a steady daily dose of about 5 g, your muscle stores fill up over roughly three to four weeks. This is the simplest approach, it is gentle on the stomach, and it reaches the same end point as loading.
With a loading phase, you take around 20 g a day, split into four smaller 5 g doses, for five to seven days, then drop to 5 g a day to maintain. Loading fills your stores in under a week, so you notice the effects sooner. The trade-off is that large doses at once are more likely to cause mild bloating or stomach upset.
Either way, the destination is the same. After about a month of consistent use you should be at full stores, and from there it is about steady daily intake plus training. Remember that creatine supports your training rather than replacing it, so the visible strength and muscle gains build over weeks and months in the gym, not overnight.
Sources
- Dietary Supplements for Exercise and Athletic Performance, NIH Office of Dietary Supplements
- ISSN position stand: safety and efficacy of creatine supplementation, Journal of the International Society of Sports Nutrition, PMC
This page is general information, not medical advice. Creatine is a dietary supplement, not a medicine. It is well studied and considered safe for most healthy adults, but talk to a doctor before starting if you have a health condition such as kidney disease, are pregnant or breastfeeding, or take prescription medication.