Grenade Carb Killa Bars Storm the US Shores

Grenade Carb Killa

After much hype, the guys discuss and review the Carb Killa protein bars from Grenade, a UK supplement company.

The claim of best protein bar is in constant flux among the fitness population. We’ve stated over and over again that our top choice for taste and texture is OhYeah! ONE Bar. But, everytime we post a protein bar review on our YouTube channel, we’re told to check out the Carb Killa Bar by Grenade.

So, we did some digging into this bar to see what it’s all about, and even bought most of the flavors to try after hearing all the hype. We’ve got all the info ahead for these baked, protein bars.

But before we get to the details, take a moment to check the best deal and sign up for alerts from PricePlow:

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Carb Killa Ingredients

Carb Killa Bars are a conglomeration of ingredients familiar to those who’ve had a protein bar a time or two before.

Grenade Carb Killa Ingredients

Most of the ingredients in here will be very familiar to you protein bar vets out there.

  • Milk Protein

    Carb Killa leads off its protein bars with a trio of milk-based proteins composed of calcium caseinate, milk protein isolate, and whey protein isolate. This gives the bars a mix of slow and fast digesting proteins and hopefully brings the bulk of the protein content to Carb Killa, because the next two forms of protein are less than ideal inclusions.

    How is calcium caseinate different from the typical micellar casein?

    Calcium Caseinate is another form of casein that differs from Micellar Casein (the type usually found in protein powders, in the way they are manufactured. Caseinate is produced from insoluble portion of milk protein. So, to get it soluble the caseinate is reacted with Calcium (an alkaline substance) which increases the mineral content of casein (giving it a higher calcium concentration than micellar) and increases is solubility. Overall though, Caseinate is inferior to Micellar Casein because it’s denatured during manufacturing.

    Note: Micellar Casein is produced without the use of chemicals.

  • Polydextrose

    Grenade Carb Killa White Chocolate

    Looks can be deceiving…the white chocolate bar was bland and unappetizing…

    Polydextrose is a polysaccharide that’s partially fermented in the large intestine[1], and considered a non-digestible type of soluble fiber synthesized from sorbitol, glucose, and citric acid. It’s often used as a sugar substitute, but it’s not very sweet like sugar, which may be one of the primary reasons these bars fail on flavor big time.

    We’re thinking this is where much of the 7g of fiber in these bars is coming from – and it’s definitely more of a “fiber” than IMO Fibers in other bars (see discussion below).

  • Gelatin

    Gelatin a.k.a. hydrolyzed collagen, is made from the collagen contained in the bones, connective tissue, and skin of animals, (sounds tasty doesn’t it?). Rather than using IMOs (isomalto-oligosaccharadies) as a binding agent / sweetener, Grenade is using a mixture of Gelatin and glycerin to hold these bars together and provide a “gooey-ish” type texture.

    Gelatin can also provide some protein, although it’s not a highly bioavailable source of protein and isn’t in the main protein blend listed above, so we’re not concerned about having it there (if the bar were solely based on gelatin protein then we’d be disappointed due to poor amino acid profile, but this is fine here). We think it’s mostly used for the binding in Carb Killa.

  • Soy Protein Isolate

    Another less than ideal form of protein in Grenade is soy protein isolate. While it’s not the worst thing to include in a protein bar, overconsumption is a bad idea.[2]

    Given that it’s not the primary protein here, it’s fine — it’s way down on the ingredients list. We just don’t want to take over 25g of soy protein in a given day.

    If Grenade really wanted to include a plant-based protein in their bars, we would have preferred them to use Pea Protein, which boasts a full amino acid profile, and doesn’t bring about hypogonadism in high doses! But pea protein also tastes like… peas.. so maybe not!

  • Sweeteners

    Jaffa Quake is a new flavor just released here in the US, so we didn’t have time to test it

    The saving grace of Carb Killa is in its sweeteners, which are xylitol and sucralose. The reason we’re ok with these being the main ones, is that Grenade isn’t using IMOs (isomalto-oligosaccharides), which can artificially inflate your fiber count (and leave a really tacky texture when chewed), as we’ve discussed extensively before in our mega post titled:

    Isomaltooligosaccharide (IMO Fiber): A Fraudulent “Fiber”?

    Just be careful though, with consuming too many sugar alcohols (like xylitol) which can cause severe GI distress in some individuals.

  • Other Ingredients

    Depending on which flavor of Carb Killa bar you get, the other ingredients will vary a bit, but here’s a few that you’ll be able getting in each bar:

    • Soy Oil
    • Tapioca Starch
    • Salt
    • Soy Lecithin
    • Milk Powder
    • Cocoa Butter
    • Peanuts

Carb Killa Macros

Grenade Carb Killa Nutrition

Each Carb Killa bar packs 23g of protein alongside 210 calories.

Each Carb Killa bar weighs in at 60g and contains the following nutritional breakdown:

  • Calories: 210
  • Protein: 23g
  • Carbs: 20g (7g fiber, 1g sugar, 11g sugar alcohol)
  • Fats: 8g (4g saturated)

Flavors Available

One thing you’ll notice about the Carb Killa Bars is that the U.S. flavor options are somewhat different than their U.K. counterparts. Domestic flavor options now include:


    These bars are super popular, especially if you can find them for cheap. Grenade has blown up and improved formulas since we originally wrote this post, so stay tuned for more updates!

    Grenade Carb Killa – Deals and Price Drop Alerts

    Get Price Alerts

    No spam, no scams.

    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.

    About the Author: Mike Roberto

    Mike Roberto

    Mike Roberto is a research scientist and water sports athlete who founded PricePlow. He is an n=1 diet experimenter with extensive experience in supplementation and dietary modification, whose personal expertise stems from several experiments done on himself while sharing lab tests.

    Mike's goal is to bridge the gap between nutritional research scientists and non-academics who seek to better their health in a system that has catastrophically failed the public.

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    1. Institute of Medicine; “Dietary Reference Intakes for Energy, Carbohydrate, Fiber, Fat, Fatty Acids, Cholesterol, Protein, and Amino Acids (Macronutrients);” 2005
    2. Siepmann, T; “Hypogonadism and erectile dysfunction associated with soy product consumption”; Nutrition; 2011 Jul-Aug; 27(7-8):859-62;

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