KBeauty Journal · INGREDIENTS · ORIGINAL EDIT
Reading a hair-care research claim before comparing prices
In brief
Amorepacific’s September study examined hair fibers. When shopping, check which formula was tested and which size and pack the retailer is selling.
On September 22, 2026, Amorepacific reported on a study published in Experimental Dermatology. The researchers found an association between expression of a gene called COCH in hair follicles and the strength of newly formed hair fibers. This finding does not tell a shopper how a particular shampoo or serum performs. For that, look for evidence on the finished formula and the outcome the brand says it tested.
When comparing two offers, start with the exact product name, formula and variant. A 250 mL bottle, a 250 mL refill and a two-bottle set are three different offers. Check whether the refill needs a dispenser you already own. If the formulas match, dividing the item price by the total volume can help you compare the cost per 100 mL.
For the amount you will actually pay, compare checkout totals in USD for the same delivery destination. Include shipping and any stated taxes or fees. If a seller has not confirmed the pack size, stock or shipping charge, leave that part of the comparison open. The underlying study is identifiable by DOI 10.1111/exd.70348.