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Acharya, S

Best Endurance Formula Pre-Workout for Beginners: C4 Sport Good for: Experienced or beginning endurance athletes looking for some extra oomph Best Endurance Formula C4 Sport Product Highlights Third-party tested by NSF-certified for Sport 200 mg of caffeine and 1 g of creatine Affordable 3 flavor options Pros & Cons Pros C4 has a history of good-tasting pre-workouts Third-party tested for purity and banned substances Low per-serving cost Cons Key ingredients like L-citrulline are missing Some ingredients, like creatine, are underdosed Bottom Line C4 Sport is a third-party tested pre-workout supplement that we recommend for those who only take pre-workouts occasionally, or those who are new to them

Compounded versions are not FDA-approved and have not undergone the same rigorous testing for efficacy, safety, and quality

Curr Opin Gastroenterol

No clinically significant CYP-mediated interactions have been documented.[23][24] Drug Transporters: ALC is transported by organic cation transporters (OCTNs)