Kirkland Signature

Kirkland Signature Protein Bar

Ranked #2 in Protein Bars

1206 LP on the category ladder what's LP?

Reliability and value incarnate, essentially a rebadged proven bar backed by Costco's support.

Consolidated from 2 independent outlets

See the sources

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Pros & cons

✓ Called 'a reliable choice for protein'
✓ RXBAR-quality clean ingredients at a warehouse value
✓ Effectively a rebadged established bar
✓ Backed by Costco's returns policy
✓ One of the lowest per-bar costs of any name-brand bar

✗ Only sold as large multi-packs at Costco, so it requires a membership and a bulk commitment
✗ A vocal minority of Reddit and Facebook users dislike the texture, so the flavor is not universal
✗ Only two of the flavors are genuinely good; the other two are merely okay

The sources behind this ranking

We searched the web and YouTube for what has been published about this product, then read the articles, video transcripts and comments we found.

2 unconvinced sources

Yahoo Life Lottë Reford · reviewer · Sept 2025

Unfortunately, though, Costco's store-brand protein bars just don't taste very good. They are overly sweet, and the sugar replacements have an aftertaste. The texture, however, is the real stumbling block. One Redditor described it as "like playdough made with sand." Having tried them myself, I have to agree. They're dry, chalky, and stick to the roof of your mouth. It is almost as if they're stale, even when well within their use by date.

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Food Republic Cami Cox · reviewer · Jan 2026

We don't know exactly why Costco has continued vending the Kirkland Signature protein bars in spite of mountainous complaints and myriad returns.

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Frequently asked questions

It ranks #2 of 16 on our protein bars tier list, in S tier. That placement draws on 2 independent outlets.

Only sold as large multi-packs at Costco, so it requires a membership and a bulk commitment. A vocal minority of Reddit and Facebook users dislike the texture, so the flavor is not universal. Only two of the flavors are genuinely good; the other two are merely okay.