Creatine
What is it?
Creatine is a nitrogenous compound naturally synthesized by the body from the amino acids arginine, glycine and methionine — mainly in the liver, kidneys and pancreas. It is stored mainly in skeletal muscle (95%) as phosphocreatine. Its central function is to regenerate ATP (adenosine triphosphate) during high-intensity, short-duration efforts, such as sprints, heavy lifts and jumps. It is the sports supplement with the highest volume of human studies and the most solid evidence in all of sports nutrition.
Main Benefits
- Increased maximum strength and explosive power
- Greater tolerated training volume
- Improved recovery between sets
- Slight muscle mass increase (via cell hydration and protein synthesis)
- Documented cognitive benefits — especially in vegetarians
- May reduce fatigue in repeated efforts
- No cycling required
Who it's for
- •Resistance training and strength sport practitioners
- •Athletes in high-intensity intermittent sports (soccer, basketball, MMA)
- •Vegetarians and vegans — lower dietary creatine intake
- •People seeking cognitive improvement
- •Elderly — may preserve muscle mass and cognitive function
- •Sprinters and power athletes
Common Dose
3–5g per day, anytime, no loading phase required. Optional loading phase: 20g/day split into 4 doses for 5–7 days (saturates stores faster, but is not necessary). Taking with carbohydrates or protein may improve muscle uptake.
Available Types
Creatine Monohydrate
Characteristics
- •Most studied form — over 95% of studies use this form
- •Most accessible cost
- •Proven efficacy in hundreds of studies
- •May cause mild water retention in some individuals
Pros
- Greatest scientific evidence of any sports supplement
- Unbeatable cost-benefit
- No need for more expensive forms
Cons
- May cause mild water retention
- Dissolves less easily in cold water
Best for
- All performance goals
- First choice for any athlete
- Continuous daily use
Micronized Creatine
Characteristics
- •Creatine monohydrate with particles reduced by micronization
- •Dissolves better in water
- •Same efficacy as standard monohydrate
- •Slightly more expensive
Pros
- Better dissolution in water
- Lower risk of gastrointestinal discomfort
- Same efficacy with smaller particle
Cons
- Slightly higher cost than standard monohydrate
- Minimal practical difference for most people
Best for
- Those with gastrointestinal sensitivity to standard monohydrate
- Those who prefer mixing in pure water without clumps
Creatine HCL
Characteristics
- •Creatine bound to hydrochloric acid
- •Very high water solubility
- •Smaller dose required (1–2g vs. 3–5g)
- •Less water retention than monohydrate
Pros
- Better solubility
- Smaller dose
- Less water retention — useful in definition phases
- Less gastrointestinal discomfort
Cons
- Significantly higher cost
- Fewer studies than monohydrate
- The practical difference does not justify the cost for most people
Best for
- Athletes in definition phase wanting to avoid water retention
- People with gastrointestinal sensitivity to monohydrate
Kre-Alkalyn
Characteristics
- •Buffered pH creatine (alkaline)
- •Premise: more stable in stomach — less conversion to creatinine
- •Smaller dose than monohydrate according to manufacturers
- •No loading phase according to manufacturer
Pros
- Less water retention than monohydrate
- Good gastrointestinal tolerance
Cons
- Comparative studies show no superiority vs. monohydrate
- Much higher cost without proven additional benefit
- The buffered pH premise has little scientific support
Best for
- Those sensitive to monohydrate who want to try an alternative — but HCL is generally the better option
Quick Comparison
| Feature | Monohydrate | Micronized | HCL | Kre-Alkalyn |
|---|---|---|---|---|
| Evidence | ★★★★★ | ★★★★★ | ★★★ | ★★ |
| Daily dose | 3–5g | 3–5g | 1–2g | 1.5–3g |
| Solubility | Good | Very good | Excellent | Good |
| Water retention | Mild | Mild | Minimal | Minimal |
| Cost | Very low | Low | High | Very high |
| Cost-benefit | ★★★★★ | ★★★★ | ★★ | ★ |
How to Choose
Creatine Monohydrate
Choose if:
- It is your first choice — always
- You seek maximum cost-benefit
- You have no gastrointestinal sensitivity
Micronized Creatine
Choose if:
- You have mild gastrointestinal sensitivity to monohydrate
- You prefer better dissolution in water
Creatine HCL
Choose if:
- You are in a definition phase and want to avoid water retention
- You have significant gastrointestinal sensitivity to monohydrate
- The higher cost is not an obstacle
Kre-Alkalyn
Choose if:
- Only if all other forms cause discomfort — the evidence does not justify the additional cost
What the Science Says
Creatine Monohydrate is the sports supplement with the highest volume of human studies — over 1,000 published studies. Meta-analyses confirm increases in strength (5–15%), explosive power and muscle mass. Cognitive benefits are documented especially in vegetarians (who have lower brain creatine stores). Long-term studies (up to 5 years) show no adverse effects in healthy people. Creatine HCL and Kre-Alkalyn have NOT demonstrated superiority over monohydrate in direct comparative studies.
Possible Side Effects
Generally very well tolerated. May cause mild gastrointestinal discomfort and intramuscular water retention (not subcutaneous — not visible swelling). Muscle cramps are attributed to creatine but not confirmed in studies. People with kidney disease should consult a doctor — creatinine metabolism may overload compromised kidneys.
Final Summary
Creatine is the sports supplement with the best available scientific evidence — period. The monohydrate form is the choice for 99% of people due to unbeatable cost-benefit and incomparable evidence base. There is no need for more expensive forms for most people. 3–5g per day, no cycling, no complications. One of the smartest investments in sports supplementation.