Kirkland Signature (Costco) - Kirkland Signature Whey Protein
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Based on 1 year's data from Mar 22, 2026 How it works
bcbum 1.0I drink premier protein too but there’s also other good ones at Costco. Alani and Kirkland both have 30g protein/ 160 calorie options, and are regularly on sale.
cazdorf 1.0I love the Kirkland whey powder, both the chocolate and vanilla. And it’s $1 per serving!
I love the Kirkland whey powder, both the chocolate and vanilla. And it’s $1 per serving!
HockeyPaul 1.0seconded. Love being "plain jane" vanilla.
MDesai91 1.0I think kirkland vanilla protien powder is good. Not sure how it mixes with water though. I have tried it with soy milk and it dissolves in a second and tastes great.
meester_jordan 1.0I just switched to the Kirkland vanilla whey and plan on sticking with it. I like it quite a bit honestly
1chester555 0.4I added a scoop of the vanilla one to my brownies and a scoop to my banana chocolate chip muffins. It’s improved the taste and added protein to my homemade goodies. Love it.
2JZMX83 0.4I didn't like it, upset my stomach. I stick with ON
3BallCornerPocket 0.4Get Kirkland if you have it. Close enough and cheaper.
4-snizzle-dizzle 0.4I think it tastes fine. Worth the discount
802ScubaF1sh 0.4Our Costco almost always has the Kirkland, ON, and Orgain plant powders for a great deal. Look for the 'Aussie Bites' in the snack section, the ingredients / protein is pretty crazy for the small bites.