Creatine supplementation increases muscle strength and muscle mass in humans by enhancing phosphocreatine availability to support ATP regeneration.

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

People who took creatine supplements while doing strength training got stronger and built more muscle than those who didn’t take creatine. This supports the idea that creatine helps muscles produce more energy for lifting and growing.

Study: Creatine monohydrate supplementation during eight weeks of progressive resistance training increases strength in as little as two weeks without reducing markers of muscle damage.

Taking creatine supplements helped people get stronger faster during weight training, which means it likely gives their muscles more energy to work harder—just like the claim says.

Study: Effect of 12 months of creatine supplementation and whole-body resistance training on measures of bone, muscle and strength in older males

People took creatine supplements for a year while doing strength training, but they didn’t get stronger or build more muscle than those who took a fake pill. So, creatine didn’t help as much as people thought it would.

Study: Creatine Supplementation Prior to Strength Exercise Training Is Not Superior in Preventing Muscle Mass Loss Compared with Standard Nutritional Recommendations in Females After Bariatric Surgery: A Pilot Study

This study looked at whether creatine helps people keep their muscles after weight-loss surgery, and it didn’t find any extra benefit. But that doesn’t mean creatine doesn’t help build muscle in healthy people who lift weights — it just wasn’t tested in that situation.