OptimalStack is the ultimate post-workout recovery stack combining 99.99% pure Creapure® micronized creatine monohydrate to enhance muscle endurance and strength and a clinical dosage of myHMB® + Vitamin D3 to reduce muscle protein breakdown.* One 9.75g serving of OptimalStack contains: o 5g Creapure® (99.99% pure micronized creatine monohydrate) o 3g myHMB® (Calcium 3-Hydroxy-3-MethylButyrate, Monohydrate) o 18.75mcg Vitamin D3 OptimalStack is rigorously third-party tested - well beyond industry standards - and has earned the premier NSF Certified for Sport® certification for quality and safety. The NSF Certified for Sport® logo guarantees that your container of OptimalStack has been certified for quality and safety and tested for heavy metals, microbial contamination, and more than 300+ banned substances. OptimalStack is the ultimate post-workout recovery supplement.