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.
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.