Certification status
NSF Certified for Sport
C4 C4 Performance Energy® Orange Slice
C4 Performance Energy Orange Slice is the orange-flavour variant of C4's ready-to-drink energy can range from US sports brand Cellucor. NSF Certified for Sport — every batch is screened against 280+ banned substances. Amazon UK lists the multi-pack at £18.
Buy in the UK
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Why this certification matters
- NSF Certified for Sport
- NSF Certified for Sport is designed for athletes in tested sports; each lot is tested for substances banned by major sports organisations.
Frequently asked questions
- What is C4 Performance Energy?
- C4 is the US sports-nutrition brand from Cellucor. Performance Energy is their ready-to-drink energy-can line — distinct from C4's pre-workout powder line.
- Where is it sold?
- Amazon UK at £18 is the listed retailer — likely a multi-pack of cans.
- How is this different from C4 pre-workout powder?
- The Performance Energy can is RTD; the pre-workout powder is the original C4 line. We list each variant separately.
- Does NSF Certified for Sport cover energy drinks?
- Yes — NSF tests the finished product against 280+ banned substances regardless of category. Stimulants are a particular focus.
- Other C4 flavours stocked?
- C4 Performance Energy Frozen Bombsicle is also listed on the site (Amazon UK £15). UK distribution of C4 cans is patchier than for domestic brands, so individual flavours come and go.
