Creatine supplementation increases intramuscular creatine stores, enhances ATP regeneration during high-intensity exercise, and results in increased training volume and measurable muscle hypertrophy over 8–12 weeks.

Study: Effects of Short-Term Creatine Monohydrate Supplementation Combined with Strength Training on the Physical Fitness Characteristics and Muscle Hypertrophy in Junior Women Wrestlers

Taking creatine supplements along with weight training helped young female wrestlers get stronger and build more muscle in just 6 weeks compared to those who didn’t take creatine. This shows creatine works as claimed.

Study: Timing of creatine supplementation does not influence gains in unilateral muscle hypertrophy or strength from resistance training in young adults: a within-subject design.

This study found that taking creatine before or after workouts helped people build more muscle and get stronger over 8 weeks, just like the claim says. It doesn't matter when you take it—creatine still works.

Study: No effect of creatine supplementation on human myofibrillar and sarcoplasmic protein synthesis after resistance exercise.

This study found that taking creatine does increase the amount of creatine in muscles, which helps with energy during workouts, but it didn't show that creatine makes muscles grow bigger right after a single workout. Other longer studies show it does help muscles grow over time.

Study: Nutritional Supplements for Muscle Hypertrophy: Mechanisms and Morphology—Focused Evidence

This study found that taking creatine for 8–12 weeks helps people lift heavier or do more reps, which leads to bigger muscles over time. It’s like giving your muscles extra fuel to work harder and grow.