Grenade Carb Killa Protein Bar Nutrition Facts (2026): 20-23g Protein, All US Flavors Compared

Grenade Carb Killa Nutrition Facts: Key US Flavors Compared

All values are per single 60g bar, sourced from Nutritionix, FatSecret, CarbManager, and MyNetDiary. Calories on European-format packaging may differ slightly from FDA Supplement Facts panels on US-sold bars — verify on your specific package label. Protein values are consistent across sources within ±1g for each flavor.

Three patterns stand out. The caramel and mint-chocolate flavors hit the highest protein (22–23g) and lowest calorie counts (203–214 cal) — Caramel Chaos at 203 calories for 23g of protein achieves 11.3g of protein per 100 calories, rivaling Quest. Peanut-based flavors run hotter on calories and fat: White Chocolate Salted Peanut peaks at 240 calories and 12g of fat. Fiber varies widely — Caramel Chaos and Dark Chocolate Mint deliver 6.7–7g per bar, while Chocolate Chip Cookie Dough and Dark Chocolate Raspberry land at only 3–3.4g. Dark Chocolate Mint achieves the lowest total sugar in the lineup at just 0.6g per bar.

What’s in the Protein Blend — and Why Collagen Matters

Grenade Carb Killa bars draw protein from a multi-source dairy blend confirmed across multiple retailer ingredient listings:

• Calcium Caseinate (milk): The primary protein source. A slow-digesting protein that also provides the dense, chewy nougat texture the bars are known for.
• Whey Protein Isolate (milk): A fast-absorbing complete protein high in leucine — the fastest-acting source in the blend for triggering muscle protein synthesis.
• Milk Protein Isolate: The natural ~80/20 casein-to-whey ratio from whole milk in a single ingredient, providing both fast and sustained amino acid release.
• Bovine Collagen Hydrolysate: A structural protein from beef connective tissue — not a muscle protein. Collagen is an incomplete protein: it is missing tryptophan, one of the nine essential amino acids. This means a portion of the bar’s headline protein gram count does not provide the full essential amino acid profile needed for muscle protein synthesis.

Not all of Grenade’s 20–23g per bar is equivalent to the same grams from a collagen-free source. Quest (milk protein isolate + whey protein isolate) and Ghost (hydrolyzed milk protein isolate + whey concentrate + milk protein isolate) both use exclusively complete protein sources; Grenade and Barebells both include collagen. For more on this distinction, see our Ghost protein bar nutrition guide or the Quest vs Barebells comparison.

Sweeteners: Maltitol and Sucralose — What That Means for Blood Sugar

Every Carb Killa bar uses two sweeteners: maltitol (primarily in the chocolate coating) and sucralose. There is no acesulfame potassium (Ace-K), no erythritol, and no stevia in the lineup.

Maltitol

Maltitol is a sugar alcohol with a glycemic index of approximately 52 — compared to table sugar’s 65 and erythritol’s near-zero. It contributes roughly 2.1 kcal per gram and appears in total carbohydrates on the label but not under “added sugars,” which is why Grenade bars show 0g added sugar while still using a partially caloric, partially glycemic compound. People managing blood glucose or following strict keto should not treat maltitol-containing bars the same as erythritol-based ones — the glycemic impact is real. Maltitol also has moderate laxative potential at high doses; one bar per day is generally within tolerance for most adults. See our best protein bars for diabetics guide for low-GI alternatives.

Sucralose

Sucralose is zero-calorie and zero-GI, used in small amounts throughout the bar. Grenade does not pair it with Ace-K — a meaningful distinction from Barebells, which uses both sucralose and Ace-K. If avoiding Ace-K specifically is your concern, Grenade is the better pick among the maltitol-sweetened bars.

Grenade Carb Killa vs. Quest vs. Barebells

All figures per single bar at the flavor and serving size shown.

At its best flavor, Grenade matches Quest on protein-per-calorie efficiency (Caramel Chaos: 11.3g vs Quest: 11.1g per 100 cal) while delivering 2g more absolute protein. Quest counters with nearly double the fiber (14g vs Grenade’s 6.7g for its best fiber flavor), a near-zero GI sweetener (erythritol vs maltitol at ~52), and a collagen-free protein blend. Barebells shares Grenade’s maltitol and collagen characteristics but also uses Ace-K on top — Grenade skips it entirely.

Is Grenade Carb Killa Healthy? Who It’s For

Grenade Carb Killa delivers real protein (20–23g of dairy-based protein with collagen) and genuinely low sugar (under 2g per bar) in the most candy-bar-like format in the mainstream US market. The honest trade-offs are the incomplete protein from bovine collagen, the glycemic impact of maltitol compared to erythritol-based bars, and a calorie range that extends to 240 for the nut-forward flavors.

Grenade is a good fit if…

• You want a candy-bar eating experience with protein-bar macros. No other mainstream US protein bar replicates Grenade’s triple-layer nougat-plus-caramel-plus-chocolate-coating construction.
• You are avoiding Ace-K. Grenade uses sucralose without Ace-K; Barebells uses both. Among the maltitol-sweetened bars, Grenade is the cleaner pick on this dimension.
• You want high absolute protein. Caramel Chaos at 23g per bar outperforms both Quest (21g) and Barebells (20g) in absolute protein grams while staying under 210 calories.
• You want flavor variety. With 15+ options including a licensed OREO collaboration and Jaffa Quake (chocolate orange), Grenade offers the widest flavor lineup of any UK-origin protein bar in the US market.

Consider alternatives if…

• Fiber is a daily bottleneck. Quest’s consistent 14g per bar is nearly double Grenade’s best-fiber flavor and four to five times higher than Grenade’s lower-fiber options. Quest is the clear pick when fiber is the priority.
• You are managing blood sugar or following strict keto. Maltitol’s GI of ~52 is real; Quest’s erythritol (GI ~1) is a meaningfully better fit for blood glucose control. See our best protein bars for diabetics guide.
• Protein completeness is the priority. The collagen in Grenade’s blend means the headline gram count is not entirely from complete protein sources. Quest and Ghost use collagen-free blends.
• You are lactose-sensitive. All of Grenade’s protein sources are milk-derived; the bars are not labeled lactose-free.

Price and Where to Buy

Grenade Carb Killa 12-packs are priced at approximately $29.50–$31.95 at Walmart (confirmed pricing), translating to $2.46–$2.66 per bar — comparable to Barebells and slightly above Quest in most bulk formats. Available at Walmart (widest in-store selection — Caramel Chaos, Dark Chocolate Raspberry, Jaffa Quake, Peanut Nutter, and others confirmed), Amazon (widest flavor selection including limited editions; Prime eligible), Target (online confirmed, in-store varies by location), and GNC (confirmed listing, in-store stock may vary).

Frequently Asked Questions

How much protein does a Grenade Carb Killa bar have?

Between 20g and 23g per 60g bar, depending on flavor. Caramel Chaos, Cookies & Cream, and Dark Chocolate Mint are the highest-protein flavors in the US lineup (22–23g); peanut-based flavors and the OREO collab deliver 20–21g. The protein comes from a blend of calcium caseinate, whey protein isolate, milk protein isolate, and bovine collagen hydrolysate — note that collagen is an incomplete protein missing tryptophan, so not all of the headline gram count comes from complete protein sources.

Does Grenade Carb Killa use artificial sweeteners?

Yes — every bar uses sucralose alongside maltitol. Maltitol is a sugar alcohol (not a synthetic compound like sucralose) with a real glycemic index of ~52 and caloric value of ~2.1 kcal/g. It does not appear as “added sugar” on the label, but it is not metabolically inert. There is no acesulfame potassium, no erythritol, and no stevia in the current Carb Killa lineup.

Is Grenade Carb Killa keto-friendly?

Conditionally. The lowest-carb flavors (Caramel Chaos, Dark Chocolate Mint) have 13.5–13.6g of total carbs with 6.7–7g of fiber. Subtracting both fiber and all sugar alcohols, estimated net carbs land in the 5–7g range. However, maltitol’s GI of ~52 means it should not be fully excluded from a blood-glucose-conscious keto budget. Higher-carb flavors (Chocolate Chip Cookie Dough at 24g total carbs) are not appropriate for strict keto under any counting method. See our best keto protein bars guide for lower-net-carb options with near-zero GI sweeteners.

Is Grenade Carb Killa gluten-free?

The core ingredient list does not include wheat, barley, or rye. However, Grenade manufactures in a facility that also processes gluten-containing products, so a “may contain gluten” advisory applies. The bars are not certified gluten-free and are not appropriate for anyone with celiac disease.

How does Grenade Carb Killa compare to Quest bars?

At Grenade’s best flavor (Caramel Chaos), it edges Quest slightly on protein-per-calorie (11.3g vs 11.1g per 100 cal) while delivering 2g more absolute protein. Quest counters with nearly double the fiber (14g vs 6.7g), a near-zero GI sweetener (erythritol vs maltitol at ~52), and a collagen-free complete protein blend. Both cost roughly $2.00–$2.66/bar in 12-packs. Choose Grenade for the candy-bar format and flavor variety; choose Quest for fiber, the lower-GI sweetener, and consistent protein efficiency across all flavors. Full breakdown in our Quest protein nutrition guide.

Bottom line: Grenade Carb Killa is the most candy-bar-like high-protein bar in the mainstream US market — a triple-layer milk-chocolate construction delivering 20–23g of protein and under 2g of sugar per 60g bar. Its flagship Caramel Chaos achieves 11.3g of protein per 100 calories, rivaling Quest’s headline efficiency number. The honest trade-offs: bovine collagen in the protein blend reduces protein quality vs. collagen-free bars; maltitol at GI ~52 is not a negligible blood-sugar impact like erythritol; and fiber ranges from only 3g in lower-fiber flavors to 7g at best — well below Quest’s 14g. Pick Caramel Chaos or Dark Chocolate Mint for the best protein-per-calorie ratio; avoid the peanut-forward flavors (White Chocolate Salted Peanut at 240 cal) if calories are tight. Find them at Walmart, Amazon, Target, and GNC, or compare the full protein bar landscape in our best protein bars of 2026 guide and the protein snacks directory.