A client sees a striking claim on a hair-care bottle and asks whether it will apply to them. Before repeating the headline, check what was tested, how it was used and what the measurement describes.
Start with the product and the complete routine
On its current Metal Detox shampoo page, L’Oréal Professionnel attaches different testing notes to different statements. One footnote refers to the shampoo after repeated use; another refers to shampoo and mask together. A further note describes a sequence involving a pre-treatment, a technical procedure, shampoo and mask.
The practical question is simple: does the claim concern the item in your hand or a routine containing several steps? Keep those conditions attached when explaining the claim. These are examples from the manufacturer’s page, rather than independent findings by HairCoSys.
Check the measurement
A laboratory measurement, a consumer opinion and a photograph answer different questions. Look for the outcome named in the source before turning it into a broader promise.
For example, the original study Effects of hard water on hair examined tensile strength and elasticity in collected hair strands after a defined exposure procedure. Its design is an example of a specific hair-fibre experiment. It should not be described as a trial of a shampoo that the study did not test.
Use a short claim card at the salon
Before adding a product statement to a consultation or display, record:
- The exact product and the source page or packaging.
- The claim and the outcome it refers to.
- Whether the test used one product or a complete routine.
- The stated number of uses, comparison and other conditions, where disclosed.
- What the source does not explain.
If the full protocol is unavailable, record that gap instead of inventing the missing details. Check the current local packaging as well: a page for another market may describe a different version.
Keep the client conversation specific
A useful explanation might be: “The brand’s footnote describes the shampoo and mask together. Let’s check whether that is the same routine you are considering.” This is an illustrative conversation, not a customer testimonial.
When discussing a client’s own experience, distinguish what they report from what the product source demonstrates. Neither a label headline nor a pair of salon photos establishes what caused an individual change.
For a structured consultation workflow, explore HairCoSys salon solutions. The third-party product example is separate from HairCoSys products and does not announce a new launch or partnership.
Sources
- L’Oréal Professionnel Metal Detox shampoo: manufacturer page and instrumental-test footnotes.
- Srinivasan et al., Effects of hard water on hair, International Journal of Trichology (2013): original-study abstract and methods.
Sources checked 10 November 2026, Hong Kong time. This is an editorial checklist for reading product information; it does not recommend a treatment or report a HairCoSys product trial.