C4 Sport lit the fuse for summer. Uncle Samberry™ is a limited strawberry and blueberry flavor made with fireworks brand Black Cat®, timed for the Fourth and America's 250th. Walmart only, and it won't last. Red, White and BOOM!
Nutrabolt's C4 Sport is lighting the fuse on summer with a limited-edition flavor: Uncle Samberry™. Built in partnership with Black Cat®, the iconic American fireworks brand, this seasonal drop brings bursts of strawberry and blueberry to the 5th-gen C4 Sport formula, timed for the Fourth of July and America's 250th anniversary celebrations. It's a Walmart exclusive, and it won't be around long.
C4 Sport received a major formula overhaul in 2024, when Nutrabolt rolled out the 5th generation with NSF Certified for Sport status, a full electrolyte matrix, and 200mg of caffeine in a fully-disclosed, zero-sugar scoop. Nutrabolt CEO Doss Cunningham traced the full origin of C4 and where the brand is headed in Episode #222 of the PricePlow Podcast, which is worth your time for the backstory. Uncle Samberry brings the same 5th-gen formula in a new seasonal look.
The brand's tagline keeps it direct: "Red, White and BOOM!" This is a seasonal Walmart exclusive, and when it sells through, it's gone.
Cellucor C4 Sport – Deals and Price Drop Alerts
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Uncle Samberry: The Fourth of July in a Scoop
Uncle Samberry builds its flavor around the classic Fourth of July palette: sweet strawberry and ripe blueberry in a zero-sugar pre-workout scoop. Per the brand's own description, it delivers "bursts of strawberry and blueberry that taste like summer", and the Black Cat® collab artwork (fireworks, the patriotic top hat, and the snarling cat) makes the theme hard to miss.
Mix one level scoop (12.4g) with 6 to 8 fl. oz. of water about 20 to 30 minutes before training. Sweetened with sucralose and acesulfame potassium, with color from vegetable juice and no artificial colors. Beta-alanine at this dose may cause a harmless tingling sensation in some users, which is normal and fades with regular use.
Ingredients Recap
We covered the full C4 Sport formula in our C4 Sport article. Here's the quick version:
- CarnoSyn® Beta-Alanine - 2g: Builds carnosine in muscle tissue to buffer acid accumulation during intense training. CarnoSyn® is the clinically studied form, and benefits build with consistent daily use.
- L-Arginine - 2g: A precursor to nitric oxide that supports blood flow during exercise. Works alongside creatine nitrate for a combined pump and performance effect.
- BetaPower® Betaine Anhydrous - 1.25g: Betaine (also known as trimethylglycine) supports cellular hydration and power output. BetaPower® is sourced from purified sugar beet extract.
- Creatine Nitrate (as NO3-T®) - 1g: Combines creatine for strength and recovery support with nitrate for blood-flow support. The NO3-T® form mixes cleanly in water.
- Taurine - 1g: Supports cellular hydration alongside the electrolyte blend.
- Caffeine Anhydrous - 200mg: The energy anchor at a dose that provides solid focus and performance support without stacking caffeine sources.
- Toothed Clubmoss Extract (1% Huperzine A) - 5mg: Huperzine A supports acetylcholine levels for the focus component of the formula.
- Electrolytes: Sodium (225mg), chloride (340mg), potassium (190mg), magnesium (20mg), calcium (25mg), and phosphorus (75mg) round out the hydration profile.
Read the full C4 Sport breakdown for the complete ingredient analysis.
Flavors Available
Uncle Samberry joins C4 Sport's lineup as a limited-time, Walmart-exclusive seasonal offering.
Here's an up-to-date list of all C4 Sport flavors:
Conclusion: Stock Up Before the Fireworks Fade
Nutrabolt CEO Doss Cunningham joins the PricePlow Podcast to talk Cellucor's rebrand, C4 Energy growth, the Bloom investment, and building the Proctor & Gamble of supplements and welness in Episode #222.
Uncle Samberry is C4 Sport's summer 2026 limited-edition flavor, and with this being a Walmart exclusive, availability is deliberately narrow. Nutrabolt says it plainly: the fuse is lit, and it won't last long. When this one sells through, it won't be restocked.
The formula hasn't changed. It's the same 5th-gen C4 Sport that earned NSF Certified for Sport status in 2024, with 200mg caffeine, CarnoSyn® beta-alanine for endurance, creatine nitrate for strength and pump support, and a full electrolyte matrix in a zero-sugar scoop. Uncle Samberry is a seasonal window to grab that formula in a flavor that won't be on shelves year-round.
Check PricePlow for pricing and Walmart availability, and sign up for C4 alerts so you're first in line for the next limited-edition drop. For context on where C4 is headed from the CEO himself, Episode #222 with Doss Cunningham is the right listen.
Cellucor C4 Sport – Deals and Price Drop Alerts
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Disclosure: PricePlow relies on pricing from stores with which we have a business relationship. We work hard to keep pricing current, but you may find a better offer.
Posts are sponsored in part by the retailers and/or brands listed on this page.
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