Pros

  • The peanut butter flavor is rich, delicious, and reminiscent of classic Reese’s Peanut Butter Cups without an unpleasant aftertaste.
  • Bars have a satisfying crunch and chewy, soft texture that many find enjoyable.
  • Each bar packs a solid 18 grams of protein with only 3 grams of sugar, making it a nutritious option.
  • Very filling and dense; a great snack to curb peanut butter cravings or hold you over between meals.
  • Convenient grand-go option suitable for breakfast, lunch, or post-workout fuel.
  • Considered high quality and superior in flavor compared to other similar products, especially Hershey’s alternatives.
  • Provides excellent value when purchased in bulk as a pantry staple.
  • Taste is often described as better than nostalgic 'Space Food Sticks,' but with more appeal and modern flavors.
  • Highly recommended for those who prefer chewy, proteiich bars with a candy-bar-like taste.

Cons

  • Contains maltitol, a sugar substitute that may cause significant digestive issues such as stomach cramps, excessive gas, diarrhea, and nausea for sensitive individuals.
  • Side effects from maltitol can be delayed by hours and may last several days, so trying one bar slowly is advisable.
  • Not ideal to consume before important events or social occasions due to potential digestive discomfort.
  • Slightly too sweet for some palates, though still enjoyable overall.
  • Does not taste exactly like a peanut butter cup, so flavor expectations should be aligned accordingly.

Bottom Line

The ONE Protein Bars in Reese’s Peanut Butter Lovers flavor offer a compelling combination of decadent peanut butter taste, high protein content, and low sugar, making them a fantastic option for snackers, athletes, or anyone craving a sweet but smart treat. However, those sensitive to sugar alcohols like maltitol should proceed with caution and test tolerance gradually to avoid unpleasant digestive side effects. If you want a dependable, tasty peanut butter protein bar with gluten-free credentials, this product stands tall. For those wary of maltitol, exploring other protein bars without this ingredient might be a safer bet.

Lowest at any Popular Retailer
$35.98 at Walmart

Where to Buy

Prices last updated: February 7th 2026 6:02 am
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