A usage period after opening is indicated on product packaging, which is denoted by a pictogram representing an open pot which indicates the recommended usage period, once packaging has been opened:
The recommended usage period is given as a number of months, which is the period during which the product must be used once it has been opened. In general it is between 6 months (6M) and 18 months (18M).
MARY COHR does not send out samples. But you can test our products by going to a salon which is an authorised agent for MARY COHR brand products.
A beautician will provide you with specific advice and will give you samples which are best-suited to your skin.