The One-Variable Test
One new product, one thing changed, four wash days, a written answer. This is what stops you from standing in front of the same cabinet again next spring, wondering how it filled back up.
Four things you need, or the test proves nothing
This is the difference between testing a product and simply using it for a while without knowing what changed.
Why a baseline. Without one, you’re comparing a new product with your memory instead of written scores. One wash day on your usual routine, scored before you open the new product, is what makes the other four mean anything.
What this can't tell you. Why. It tells you whether, which is the part you can act on. Four wash days in one season on one head isn't a study, and this page won't pretend otherwise.
Free, and it stays free
Know someone with a full cabinet?
She’ll read her first label in about a minute, on her phone, standing in the store. There’s nothing to sign up for, and it reads her hair the same way it reads yours.
https://www.curlcentric.com/how-to-tell-if-a-hair-product-works/