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Creatine

Other tracked
ATP · strength

Your intake

Today (logged)
0 g
0% of 3 g
Stack potential
0 g
0% of 3 g
Target
3 g
Target Range
Where you are on the ladder0% of target

What each level of creatine does

Approximate dose-response bands. Individual response varies — these are starting points, not prescriptions.

  1. Severely lowYOU ARE HERE
    0 g – 0.99 g

    Well below target. Risk of deficiency symptoms tied to atp · strength.

  2. Insufficient
    0.99 g – 3 g

    Below the recommended daily target. Long-term adequacy not assured.

  3. Adequate
    3 g – 4.5 g

    Daily target met. Standard nutritional support for atp · strength.

  4. Therapeutic
    4.5 g – 6 g

    Common for specific health goals. Check the evidence for your situation before sustaining this level.

  5. Diminishing returns
    6 g – +

    Past the point where extra intake typically helps. Evidence for further benefit is thin.

Overview

Nitrogenous compound stored mostly in skeletal muscle as phosphocreatine — the rapid-regeneration buffer for ATP during high-intensity efforts. Most-studied sports supplement in history, with consistent benefits for strength, power, lean mass, and (increasingly) cognition. Synthesised endogenously (~1 g/day) from arginine, glycine, and methionine; vegetarians have lower baseline stores.

Functions

  • ●Phosphocreatine rapidly regenerates ATP during 1–10 sec maximal efforts
  • ●Increases muscle cell volume (osmotic, anabolic signal)
  • ●Supports brain energy metabolism (15-20% of total creatine pool is brain)
  • ●Modulates mitochondrial energy buffering

Mechanism

Creatine kinase transfers the high-energy phosphate from phosphocreatine to ADP, regenerating ATP in milliseconds — bridging the gap until glycolysis and oxidative phosphorylation catch up. Saturating muscle creatine stores (~20% increase) extends maximal-effort capacity, increases training volume, and over weeks drives lean mass gain. Brain creatine supports cognitive performance under fatigue and sleep deprivation.

Benefits

  • ●Improves strength, power, and lean mass with resistance training (~5–10% beyond training alone)
  • ●Improves cognition under sleep deprivation and acute mental fatigue
  • ●May modestly improve cognition and depression in older adults
  • ●Slows progression in some neuromuscular diseases (creatine kinase deficiency, McArdle)
  • ●Improves bone density in older adults when paired with resistance training
  • ●Modest benefit in vegetarians (whose baseline stores are lower)

Deficiency

Not classically essential — endogenous synthesis maintains baseline. Vegetarians/vegans have ~30% lower muscle stores; supplementation shows larger effects in them.

Signs
  • ●Reduced anaerobic performance
  • ●Possible subtle cognitive effects under fatigue
  • ●Rare inherited creatine deficiency syndromes (intellectual disability, seizures)
At-risk groups
  • ●Strict vegetarians/vegans
  • ●Inherited creatine biosynthesis defects

Excess

Tolerated to 10 g/day. Old kidney-damage claims are not supported in healthy individuals. Hydration is the main practical consideration.

Signs
  • ●Mild GI upset, especially during loading
  • ●Mild water retention (1–2 kg, intracellular)
  • ●Possible elevated serum creatinine (lab artifact — not kidney damage)
  • ●Caution in pre-existing renal disease

Forms

  • Creatine monohydrate
    The form with all the evidence; cheap; 5 g/day; gold standard
  • Micronized creatine monohydrate
    Finer particle; dissolves better; no superiority documented
  • Creatine HCl
    More soluble; marketing claim of better absorption is unsupported
  • Buffered creatine (Kre-Alkalyn)
    No documented advantage over monohydrate
  • Creatine ethyl ester
    Worse than monohydrate in head-to-head trials

Food sources

  • Beef (cooked) · 3 oz0.4 g
  • Pork (cooked) · 3 oz0.4 g
  • Cooked salmon · 3 oz0.4 g
  • Cooked herring · 3 oz0.7 g
  • Cooked chicken breast · 3 oz0.3 g

Supplement forms

Creatine monohydrate is the only form that's well-studied at the gram-per-day level. 5 g/day is the maintenance dose; loading is optional (20 g/day × 5–7 days saturates faster but isn't required). The 'creatine HCl' and 'micronized' versions sell at premium prices for no documented advantage. Take with carbs and/or protein for slightly improved muscle uptake.

Bioavailability

~95% oral bioavailability. Insulin enhances muscle uptake — pairing with carbs or post-workout protein slightly raises muscle storage. Daily dosing saturates muscle in ~3–4 weeks without loading; loading saturates in ~5–7 days.

Longevity relevance

Increasingly cited in healthspan contexts: sarcopenia prevention (with resistance training), cognitive support in older adults, bone density support. Among the highest-evidence supplements with a clean safety profile and demonstrated effects on aging-relevant endpoints (muscle, bone, cognition).

Relationships

Synergies (works better with)
  • Resistance training · Creatine without training has minimal effect on lean mass; the combination is the point
  • Carbohydrate, protein · Insulin response increases muscle creatine uptake (~30%)
  • Beta-alanine · Complementary buffering — different time domains (creatine 1–10 sec, beta-alanine 1–4 min)
Antagonists (competes with / inhibited by)
  • Caffeine (very high acute) · Possible blunting of creatine ergogenic effect at extreme doses; chronic moderate caffeine fine

References

About Creatine

Phosphocreatine pool; high-intensity output, cognition. Target reflects common 3–5 g maintenance (no FDA DV).

Role
ATP · strength
Daily target
3 g (TR)
Also called
creatine, creatine monohydrate, creatine hcl
Click here to learn more about Creatine →
Full explainer on Formulate Health — mechanisms, who's commonly deficient, food sources, evidence for supplementation.
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How Creatine acts on the body

The mechanisms and systems this nutrient feeds. Click any to drill into what runs on it.

Biochemical pathways
ATP / Mito
Body systems
Muscle