Caffeine may blunt some creatine effects
An older study suggested caffeine could interfere with creatine's performance benefits, though more recent research is mixed. Any effect is likely modest and dose-dependent. Both are widely co-supplemented in pre-workouts without obvious problems.
If you want to be conservative, take creatine post-workout and caffeine pre-workout. For most people co-timing is fine.
Optional: space 2+ hours apart
Caffeine may blunt some creatine effects. If you want to be conservative, take creatine post-workout and caffeine pre-workout. For most people co-timing is fine.
Optional: space 2+ hours apart
This interaction is rated “Caution” by Formulate. An older study suggested caffeine could interfere with creatine's performance benefits, though more recent research is mixed. Any effect is likely modest and dose-dependent. Both are widely co-supplemented in pre-workouts without obvious problems.
Studies from our registry that mention caffeine or creatine. Each links to the primary source and the other Formulate pages citing it.
Mentions creatine · 2021
Common questions and misconceptions about creatine supplementation: what does the scientific evidence really show?
Antonio et al. · Journal of the International Society of Sports Nutrition
Systematic review comparing monohydrate to alternative forms — no meaningful difference in muscle creatine uptake.
Mentions creatine · 2021
Creatine Supplementation in Women's Health: A Lifespan Perspective
Smith-Ryan et al. · Nutrients
Narrative review highlighting benefits for women: strength, body composition, bone health, mood, and cognitive function.
Mentions creatine · 2018
Effects of creatine supplementation on cognitive function of healthy individuals: a systematic review of 6 randomized controlled trials
Avgerinos et al. · Experimental Gerontology
Meta-analysis of 6 RCTs showing creatine improved short-term memory and reasoning in healthy adults, especially under stress/sleep deprivation.
Mentions creatine · 2017
International Society of Sports Nutrition position stand: safety and efficacy of creatine supplementation in exercise, sport, and medicine
Kreider RB, Kalman DS, Antonio J, et al. · Journal of the International Society of Sports Nutrition
Reviews 500+ studies and concludes creatine monohydrate is the most effective ergogenic nutritional supplement for high-intensity exercise and lean body mass, with an excellent safety profile across populations.
Mentions creatine · 2013
The effects of pre versus post workout supplementation of creatine monohydrate on body composition and strength
Antonio and Ciccone · Journal of the International Society of Sports Nutrition
Small (n=19) trial suggesting modest post-workout edge in lean mass and strength gains vs pre-workout timing.
Mentions creatine · 2012
Creatine supplementation with specific view to exercise/sports performance: an update
Cooper R, Naclerio F, Allgrove J, Jimenez A · Journal of the International Society of Sports Nutrition
Updates evidence on creatine loading (20g/day × 5–7 days then 3–5g/day maintenance) vs low-dose slow-load protocols, confirming comparable saturation by ~28 days.
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Nootropics Guide 2026: Ranked by Clinical Evidence
Learn which nootropics actually work for focus and cognition. Tiered by human RCT data — from caffeine + L-theanine to lion’s mane — with doses, red flags, and stack advice.
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We tested 8 creatine supplements on dose accuracy, purity, and Creapure sourcing. Find out which monohydrate products actually deliver 3–5g per serving.
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Creatine Loading Phase: Evidence-Based Guide 2026
Find out if creatine loading is worth it. We break down the saturation science, compare both protocols, and tell you which fits your timeline.
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Creatine for Women: The Complete Evidence-Based Guide (2026)
Women's creatine research through menopause, training, body composition, and mood. No bloating myths, no men's-magazine claims — just the evidence.
Other interactions to know
L-theanine smooths caffeine's effects
Creatine and beta-alanine stack well for power + endurance
HMB + creatine synergy for strength and lean mass
Check your full stack in the free interaction checker.
The free checker lets you add any combination of supplements and medications at once. The free web app goes further — every stack change surfaces interaction alerts automatically.
Medical disclaimer. This page is for educational purposes only and does not replace advice from a qualified healthcare provider.
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