11 Best Protein Bars at Costco in 2025
If you’ve been to Costco lately, you’ve likely seen the increasing number of brightly packaged protein bars appearing on shelves and probably wondered which are the best protein bars at Costco. Choosing a protein bar is not as simple as it sounds. You’ve got to take a close look at nutrition facts like the amount of protein, calories, sugar content and saturated fat.
Texture, flavor and dietary preferences like gluten-free or vegan options can also play a big role in finding the right bar for you. To help you pick ones that are actually healthy and still taste good, we’ve compiled a list of the best-tasting protein bars at Costco.
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The 11 Best Protein Bars at Costco for On-the-Go Energy
1. Kirkland Signature Chewy Protein Bar, Peanut Butter & Semisweet Chocolate Chip
When you think of the best protein bars at Costco, the first brand that comes to mind is Kirkland Signature. This brand is owned by Costco and has a range of delicious protein bars packed with all the right ingredients one could want in a protein bar.
This peanut butter and chocolate chip flavor easily ranks among the best protein bars at Costco — it has a slightly chewy, gritty texture with a rich peanut taste that never overshadows the chocolate. The bar comes with a decent 10g of protein and 190 calories, making it a great snack to keep you satiated between meals.
2. RX Bar, Chocolate Sea Salt
Sometimes simple is best and this salty, chocolate RX Bar is proof. When looking for the best protein bars at Costco, you need to pay close attention to the ingredients list — this bar’s short one is especially impressive. It’s made with egg whites, almonds, cashews, dates and 100% chocolate.
The result? A decadent, chewy chocolate protein bar with a sprinkle of sea salt. This delicious protein bar has 210 calories, 2g of saturated fat, 13g of sugar (no added sugar) and a plentiful 12g of protein, making it one of the healthiest protein bars on the market.
3. Kirkland Signature Protein Bars, Chocolate Chip Cookie Dough
If you’re a fan of cookie dough, you’re going to want to try the Kirkland Signature chocolate chip cookie dough flavor. Made with real chocolate and no artificial flavors, this is the best protein bar at Costco that is low in sugar, gluten-free and still has an impressive amount of protein.
With only 2g of sugar and a whopping 21g of protein, many consider it among the best protein bars at Costco. It also avoids the chalky texture that other protein bars often have. Some people even like to refrigerate or freeze it briefly to firm up the slightly chewy texture.
4. Kirkland Signature Protein Bars, Chocolate Peanut Butter Chunk
Another Kirkland Signature protein bar we recommend for the delicious taste is the chocolate peanut butter chunk flavor. The protein bars are made with real peanut butter in a chocolate cookie dough mixture. The best part of this protein bar is the generous chunks of peanut butter!
What makes this one of the best protein bars at Costco is the low sugar content (2g), 10g of fiber and 21g of protein. These protein bars are also gluten-free with no artificial flavors.
5. Ready Clean Protein Bars, Chocolate Peanut Butter and Dark Chocolate Sea Salt
When choosing the best protein bars at Costco, the ingredients play an important role. If you’re looking for bars with no additives or preservatives, the Ready Clean Protein Bars are a great choice. In one pack, you can savor 12 decadent chocolate peanut butter bars and 12 dark chocolate sea salt bars, all boosted with flaxseeds for extra fiber.
These nutritional protein bars come packed with 15g of protein to support muscle recovery and growth. What makes them stand out from others on this list is that they also contain 6.5g of nutrient-rich whole grains.
6. Pure Protein Chocolate Peanut Butter
Peanut butter and chocolate are a popular flavor combination found in many of the best-tasting protein bars at Costco, and Pure Protein is no exception. Enjoy bites of rich, slightly salty peanut butter that pair perfectly with the smooth chocolate.
All flavors used are natural and contain whey protein isolate that boasts 20g of protein, 200 calories and only 2g of sugar. The only drawback to be aware of is the low fiber content, so it’s recommended to increase your fiber intake in other ways.
7. CLIF Builders Chocolate Chip Cookie Dough Flavor Protein Bar With Caffeine
The CLIF Builders chocolate chip cookie dough flavor protein bar with caffeine is the ultimate choice for anyone seeking both a protein and caffeine boost in one go. Because it’s low-glycemic, many consider it the best protein bar at Costco for diabetics.
At 290 calories, it’s also one of the highest-calorie bars on this list, making it a solid option for those needing a more substantial snack. Each bar provides 20g of plant-based protein and 65mg of caffeine in a chewy chocolate chip cookie dough. In addition to being gluten-free, this protein bar is also non-GMO.
8. Robert Irvine's FITCRUNCH High Protein Bar, Mint Chocolate Chip
Popular chef Robert Irvine from the hit TV show Dinner: Impossible has a range of some of the best protein bars sold at Costco. What makes these protein bars so popular is the texture. A lot of high-protein bars are known for having a tacky or chewy texture but this brand of protein bars has a crumbly texture, more like a cookie.
The six-layer bar comes with a cookie bar, cream, chocolate chips, two layers of chocolate coating, protein chips, a chocolate drizzle and a light mint flavor. Each bar has 3g of sugar and an acceptable 16g of protein.
9. Nature Valley Protein Bar, Peanut Butter Dark Chocolate
Known for its popular granola bars, Nature Valley also offers chewy protein bars made with natural flavors. The peanut butter dark chocolate variety is one of the best protein bars at Costco, featuring a delicious blend of roasted peanuts, rich dark chocolate chips and creamy peanut butter.
If you don’t fancy the chewy and chalky texture protein bars often come with, you will enjoy this crunchy bar. With no artificial colors, flavors or high fructose corn syrup, this is one of the best protein bars at Costco, ideal for any time of the day. Each protein bar comes with 10g of protein and 7g of sugar.
10. Think! Thin High Protein Bar, Banana Oat Muffin
Enjoy an on-the-go Think! Thin High Protein Bar in banana oat muffin flavor. Each bite comes with the comforting flavor of tropical bananas and fresh-baked oat muffins that have come straight out of the oven.
This is one of the best protein bars at Costco that includes the texture of oats in the bar. These bars come with an impressive 20g of protein, 10g of fiber and only 1g of sugar, making it a great option for those keeping track of their daily sugar intake.
11. Robert Irvine's FITCRUNCH High Protein Bar, Chocolate Peanut Butter
Robert Irvine's chocolate peanut butter bar is another popular flavor from the brand and is one of the best protein bars at Costco. Each baked whey protein bar has a peanut butter soft cookie center with added pieces of peanut for extra crunch and topped with rich chocolate.
This is one of the best protein bars at Costco for those looking for a decadent chocolate bar that only has 3g of sugar, is gluten-free and has 16g of protein but tastes like a dessert in a wrapper.
What Are the Best Protein Bars at Costco?
The Kirkland Signature Protein Bars in chocolate chip cookie dough flavor are widely regarded as some of the best protein bars sold at Costco. Rich in chocolate and packed with 21g of protein, they make excellent high-protein snacks to enjoy between meals or before a workout.
However, if you prefer a non-chocolate option, the Think! Thin High Protein Bar in banana oat muffin flavor is another good choice, offering a similar balance of protein and fiber. Ultimately, the “best” bar depends on personal taste and dietary needs, but these two are our top picks from Costco.
Adding more protein to your diet has never been easier with these best protein bars at Costco. They’re small enough to keep on hand when you’re in a rush, exploring the outdoors or just wanting to keep your energy levels up during the day.
While there is an overwhelming number of options available, not all protein bars are made equal. So, we hope this helps you find the best protein bars at Costco that taste good!
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