Some people have reported troubles redeeming these coupons (namely in Rexall locations), so WE HAVE A SOLUTION!!
Below is a link generously shared by our friends at CCC that contains a letter from EMD explaining the validity of the coupons. You can print this and bring it to your store just in case there are any issues. Please note that although the coupon doesnt state this, the letter does express a limit of one per customer.
Multibionta Letter of Validity
HAPPY SAVING:)