C4 Pre-Workout is a workout supplement line from Cellucor that people may take before exercise to help increase energy, alertness, and strength. They contain caffeine and creatine, which may help ...

Most pre-workout supplements are considered safe for many adults, but they are not essential for health or exercise performance. Their ingredient mixes vary widely by brand. Ingredients like caffeine, ...

Medically reviewed by Allison Herries, RDN Key Takeaways Pre-workout supplements can give you energy but may cause jitters or ...

Pre-workout refers to dietary supplements that people can take before a workout to help maximize their training. Available as premixed drinks, powders, pills, and snack bars, manufacturers formulate ...