Scientific Citations
At CreatineIQ, our dosing logic is rooted in peer-reviewed science. Learn how our Standard, Tailored, and Optimal calculations are backed by clinical pharmacokinetics.
Calculation Logic & Basis
Our calculation models use a physiological ceiling of approximately 150-160 mmol/kg of dry muscle mass for saturation. We use Lean Body Mass (LBM) to estimate total skeletal muscle—assuming skeletal muscle accounts for approximately 45% of total LBM—and thereby determine total creatine storage capacity.
The body naturally degrades roughly 1.6% to 2.0% of its total creatine pool into creatinine every day. For high-intensity athletes, this turnover rate slightly increases. This baseline rate forms our maintenance dose calculation.
Diet significantly impacts your starting baseline saturation. Vegans typically have lower baseline saturation levels (~60%) since dietary creatine is found almost exclusively in meat. Conversely, carnivore or high-meat diets lead to a higher baseline (~80%).
Large boluses of creatine (typically >10g) can draw excess water into the intestines through an osmotic effect, leading to gastrointestinal distress. To prevent this, the calculator strictly applies your personal Dose Limit as the maximum daily intake during the loading phase, extending the loading duration over more days rather than recommending multiple large doses per day.
Primary Literature
Single- and multiple-dose pharmacokinetics of oral creatine
Demonstrates the clearance, maximum concentration, and penetration of creatine into interstitial muscle spaces, establishing the pharmacokinetic basis for standard dosing per body weight.
Pharmacokinetics of the dietary supplement creatine
Details the gastrointestinal absorption limits and the distribution of creatine throughout the body, focusing on how cells handle rapidly changing energy demands with ATP generation.
Risk of Adverse Outcomes in Females Taking Oral Creatine Monohydrate: A Systematic Review and Meta-Analysis
Highlights safety protocols and reinforces the lack of serious adverse outcomes at standard clinical doses, while emphasizing that side effects like gastrointestinal distress are typically dose-dependent.
Effect of creatine and weight training on muscle creatine and performance in vegetarians
Establishes the physiological discrepancy in baseline intramuscular creatine stores between vegetarians (e.g., ~117 mmol/kg dry mass) and non-vegetarians (e.g., ~130 mmol/kg dry mass), supporting our calculator's baseline saturation scaling across different diet types.
Brain Health Literature
Effects of creatine supplementation on cognitive function of healthy individuals: A systematic review of randomized controlled trials
Avgerinos, K. I., Spyrou, N., Bougioukas, K. I., & Kapogiannis, D. (2018). Experimental Gerontology, 108, 166-173.
“Heads Up” for Creatine Supplementation and its Potential Applications for Brain Health and Function
Candow, D. G., Forbes, S. C., Ostojic, S. M., et al. (2023). Sports Medicine, 53, 49-65.
Creatine Supplementation and Brain Health
Roschel, H., Gualano, B., Ostojic, S. M., & Rawson, E. S. (2021). Nutrients, 13(2), 586.
Protocol for a single-arm, pilot trial of creatine monohydrate supplementation in patients with Alzheimer’s disease
Taylor, M. K., Burns, J. M., Choi, I.-Y., et al. (2024). Pilot and Feasibility Studies, 10.
The effects of creatine supplementation on cognitive function in adults: a systematic review and meta-analysis
Xu, C., Bi, S., Zhang, W., & Luo, L. (2024). Frontiers in Nutrition, 11.