Supplement Dosing
Last reviewed: May 2026
Creatine monohydrate is the single most researched sports supplement in history, with over 500 peer-reviewed studies confirming its safety and efficacy.[1] It works by increasing phosphocreatine stores in muscle, which allows your body to produce more ATP (energy) during high-intensity exercise. The result is measurable improvements in strength (5-10%), power output, and lean mass over time.[2] Pair creatine supplementation with proper protein intake and a structured training program for best results.
| Body Weight | Maintenance Dose | Loading Dose (optional) | Time to Saturation |
|---|---|---|---|
| Under 140 lbs | 3 g/day | 15 g/day × 5 days | 3–4 weeks (no load) |
| 140–180 lbs | 4 g/day | 20 g/day × 5 days | 3–4 weeks (no load) |
| 180–220 lbs | 5 g/day | 20 g/day × 7 days | 3–4 weeks (no load) |
| Over 220 lbs | 5–7 g/day | 25 g/day × 5 days | 3–4 weeks (no load) |
Creatine is a naturally occurring compound found in muscle cells that plays a central role in the phosphocreatine energy system — the body's fastest pathway for regenerating ATP (adenosine triphosphate), the molecular currency of cellular energy. During short bursts of high-intensity effort like sprinting, heavy lifting, or jumping, muscles consume ATP faster than the aerobic system can replenish it. Phosphocreatine donates its phosphate group to rapidly regenerate ATP, providing an additional 5–10 seconds of peak-intensity work capacity. Supplementing with creatine increases intramuscular creatine stores by 20–40%, directly extending the duration and intensity of explosive efforts.
| Phase | Daily Dose | Duration | Time to Saturation |
|---|---|---|---|
| Loading | 20g (4 × 5g) | 5–7 days | 5–7 days |
| Maintenance (after loading) | 3–5g once daily | Ongoing | Already saturated |
| No loading (daily only) | 3–5g once daily | Ongoing | 3–4 weeks |
Loading saturates muscle stores in about one week by front-loading 20 grams per day split into four 5-gram doses. The maintenance approach of 3–5 grams daily achieves the same saturation level but takes 3–4 weeks. Both methods produce identical creatine stores once saturation is reached — loading simply gets you there faster. Most sports scientists recommend skipping the loading phase unless there is a specific time-sensitive event, as the maintenance dose is simpler, causes less gastrointestinal discomfort, and achieves the same endpoint.
The standard 5-gram daily maintenance dose works well for most people, but body weight–adjusted dosing provides more precision. Research supports a maintenance dose of 0.03–0.05 grams per kilogram of body weight per day. A 150-pound (68 kg) person needs approximately 2–3.4 grams daily, while a 220-pound (100 kg) person benefits from 3–5 grams. During a loading phase, the weight-adjusted protocol is 0.3 grams per kilogram per day for 5–7 days. Exceeding these doses does not increase muscle creatine stores — the excess is simply excreted by the kidneys.
Creatine monohydrate is the most extensively studied sports supplement in history, with over 500 peer-reviewed studies supporting its efficacy. The consistent findings across decades of research include a 5–10% increase in maximum strength on compound lifts, an 8–14% increase in high-intensity exercise performance (sprints, intervals, repeated efforts), enhanced recovery between sets and training sessions, and increased lean body mass of 1–3 kg during the first month of supplementation (partly water retention, partly accelerated muscle growth). Endurance athletes see less direct benefit from creatine because their primary energy system is aerobic rather than phosphocreatine-dependent, though benefits to sprint finishes and high-intensity intervals within endurance events have been documented.
The initial weight gain from creatine supplementation — typically 1–3 pounds in the first week — is primarily intracellular water retention, not fat gain. Creatine draws water into muscle cells, increasing cell volume. This increased hydration has a beneficial effect: well-hydrated muscle cells show enhanced protein synthesis and reduced protein breakdown, creating a more anabolic environment for muscle growth. Over 8–12 weeks of training with creatine supplementation, the additional lean mass gain typically exceeds the initial water weight, meaning the scale increase reflects genuine muscle tissue growth beyond the water component.
The claim that creatine damages kidneys is not supported by any peer-reviewed evidence in healthy individuals. A 2019 systematic review of 15 studies found no adverse effects on kidney function in healthy adults supplementing with creatine at recommended doses for periods up to five years. Creatine does increase creatinine levels in blood tests — creatinine is a breakdown product of creatine, not an indicator of kidney damage in this context. Individuals with pre-existing kidney disease should consult their physician, but for healthy people, creatine monohydrate has one of the strongest safety profiles of any supplement on the market.
Other common concerns — hair loss, dehydration, cramping, and digestive issues — are either unsupported by evidence or dose-dependent. The single study linking creatine to elevated DHT (a hormone associated with hair loss) has never been replicated. Dehydration and cramping claims are contradicted by research showing creatine actually improves hydration status and reduces cramping risk. Digestive discomfort occurs primarily during loading phases with high single doses; splitting into smaller doses or using the maintenance-only approach eliminates this issue for nearly all users.
Despite marketing claims for creatine HCl, buffered creatine, creatine ethyl ester, and liquid creatine, no form has demonstrated superior bioavailability or efficacy compared to plain creatine monohydrate in controlled studies. Creatine monohydrate is the form used in virtually all positive research, costs 80–90% less per serving than specialty forms, and has the longest safety track record. The International Society of Sports Nutrition position stand explicitly states that creatine monohydrate is the most effective and most cost-efficient form available. A 500-gram container at $15–$20 provides 100 days of supplementation at the standard 5-gram dose.
The timing of creatine intake matters less than consistency. Studies comparing pre-workout, post-workout, and random timing show minimal differences in long-term creatine stores and performance outcomes, as long as the daily dose is consumed consistently. Taking creatine with a meal that contains carbohydrates and protein may slightly improve absorption due to the insulin spike enhancing creatine uptake into muscle cells, but the practical difference is small. The simplest approach is to add creatine to your post-workout shake or morning beverage and take it at the same time daily to build a consistent habit.
Vegetarians and vegans often respond more dramatically to creatine supplementation because their baseline muscle creatine stores are lower — meat and fish are the primary dietary sources of creatine. Studies show vegetarians gain 20–30% more lean mass from creatine supplementation compared to omnivores over the same training period. Older adults benefit from creatine's ability to preserve muscle mass and strength during age-related muscle decline (sarcopenia), with research showing improved functional performance in adults over 65 when combining creatine with resistance training. Emerging research also explores creatine's cognitive benefits, as the brain is a significant consumer of ATP, with studies showing improved working memory and processing speed during sleep deprivation and mentally demanding tasks.
→ Creatine monohydrate is the proven form. Other forms (HCL, buffered, ethyl ester) show no advantage.[1]
→ Take it every day. Consistency matters more than timing.
→ Mix with water or juice. Creatine dissolves poorly; stir well or use warm liquid.
→ Stay hydrated. Creatine pulls water into muscles. Use the Water Intake Calculator to ensure adequate hydration.
See also: Protein Calculator · Macro Calculator · One Rep Max · TDEE