PAY ATTENTION! BEFORE YOU USE THAT PRODUCT MAKE SURE YOU CHECK THIS THING IN CIRCLE. Most people pay attention only to the expiration date (Expiry) And IGNORE the M. This has affected a lot of people. See what this M means.
The M is trying to pass out an important information to you. It is trying to tell you the shelf life of the product after opening it. Check this picture below to understand what I am saying.
In this picture, check that circle to see what was written which is "9M"
The M placed beside the 9 is referring to months. The M simply means Month. In this picture there is 9M which is trying to pass an important message to you that the product is valid for 9 month after opening.
If you buy cream, lotions, toothpaste or any other product and see 9 you already know what it means. It means that the product is valid for 9 months after opening it.
If you see 1M, it means that the product is valid for one month after opening it.