Very charming
but I believe the thread was about add ons not what you or I believe.
As with all retail items there is of course good and poor quality and i would always make sure you buy the best quality and ask for certification to ensure it is approved and legal for sale and use in your country.
Detox patches are just an example for retail items such as tanning moisturizers, exfoliators, spa products etc that are a fantastic add on to any salon and can help to increase sales and profit without tying your time as a therapist up. Especially if you choose retail items that compliment your treatments clients will take this up easily and it will not only help your business but also make your work easier if clients use the recommended before/after products to look after their skin/hair/tan/nails etc.