Creatine: The Complete Science-Based Guide
TL;DR
- What: creatine monohydrate — the most researched supplement in sport
- Dose: 3–5 g every day; loading is optional
- Benefits: more strength, power, training volume and muscle over time
- Safety: well-studied and safe for healthy adults long term
- Weight gain: early 1–2 kg is water in the muscle, not fat
1) What creatine actually does
Creatine is a compound your body already makes and stores mostly in muscle, where it helps regenerate ATP — the energy currency for short, explosive efforts. Supplementing raises your muscle creatine stores, so you can squeeze out an extra rep or two and produce slightly more force. Over weeks and months, that extra training volume adds up to measurable gains in strength and muscle. It is one of the very few supplements with overwhelming evidence behind it.
2) How much to take
The simple protocol is 3–5 grams of creatine monohydrate per day, every day — training day or not. That's it. You can optionally "load" with about 20 g/day (split into 4 doses) for 5–7 days to saturate your muscles faster, then drop to 3–5 g. Both approaches reach the same muscle saturation; loading just gets you there in a week instead of three to four.
| Approach | Protocol | Time to full effect |
|---|---|---|
| No-load (recommended) | 3–5 g/day | ~3–4 weeks |
| Loading | 20 g/day × 5–7 days, then 3–5 g/day | ~1 week |
3) Timing: does it matter?
Barely. Studies show only a small possible edge to taking creatine near your workout versus other times. What truly matters is taking it consistently every day so your muscle stores stay topped up. Pick a time you'll remember — with breakfast, in a shake, or post-workout — and stick to it.
4) Which form should you buy?
Creatine monohydrate. Fancier forms (HCl, buffered, "ester") are more expensive and have no proven advantage. Look for a plain monohydrate, ideally Creapure-certified for purity. Powder is cheaper than capsules and dissolves fine in water or juice.
5) Side effects and safety
For healthy adults, 3–5 g/day is safe for long-term use and has been studied for decades. The most common "side effect" is a small amount of water retention inside the muscle. Some people get mild stomach discomfort if they take a big dose on an empty stomach — splitting the dose or taking it with food fixes that. Creatine does not damage healthy kidneys, but if you have existing kidney disease, check with your doctor first.
6) Who benefits most?
- Anyone doing resistance training: the classic use case — more strength and muscle.
- Power and team-sport athletes: better repeated sprint and jump performance.
- Vegetarians and vegans: often start with lower stores, so they may see a bigger jump.
- Older adults: emerging evidence for muscle and possibly cognitive support alongside training.
Creatine works best when the rest of your nutrition is dialled in — especially protein and total calories. KeplerFit can estimate both from a photo of your meal, so you can make sure your training and supplements aren't being wasted by under-eating protein. See how it works →
FAQ
How much creatine should I take?
3–5 g of monohydrate daily. Loading (20 g/day for a week) is optional and reaches the same level faster.
Do I need to load or cycle?
No to both. Daily 3–5 g works; no breaks needed.
Does creatine cause weight gain?
A small early gain (1–2 kg) is water inside the muscle, not fat.
Is creatine safe?
Yes, for healthy adults at 3–5 g/day long term. With kidney disease, ask your doctor.