
We had a good run, Costco Kirkland Signature Shampoo and Conditioner. I’ve been using this duo since the TRESemme-induced hair loss I shared in January 2021, but alas – I’ve run afoul of a discontinuation-style issue.
This Again?
It isn’t a true discontinuation. Costco reformulated within the last year or so. I only just started using the new formula at the end of June because I was still working through my liter bottles of the previous formula.
I didn’t realize it was a reformulation (as opposed to just a packaging refresh) until three weeks ago. My hair started becoming a nightmare to wrangle again, symptomatic of overexposure to protein (everyone is different, you may never experience this!), but it didn’t click immediately.
Was it stress? No, that’s just a constant at this point. Eventually, I scrutinized the ingredients list on the new bottles – yep, go figure. The old formula had protein, but it was one of the last few ingredients – so there was less of a concentration of it. It doesn’t seem like my hair can’t deal with any, just either 1) high concentrations and/or 2) specific varieties. Alas, my hair is not tolerating the Costco Kirkland Signature Shampoo and Conditioner’s new formula well.
If it is still working well for you, GOOD! I still have faith in the product. This time, truly, I am the problem.


How the hell is this a hack? It’s been a few years since I’ve had bangs, but washing my whole head would be easier, quicker (drying might take longer, but still!), and result in less mess. Suuure, wash your hair in the sink, they say. It’s easy, they say. Is it effortless the same way the ladies in skincare commercials wash their face at the sink, splashing water everywhere like a damn Magikarp?