Gainz Box March 2018 Spoilers! Last updated by Hello Subscription on February 15, 2018. Subscription Box Spoilers / Gainz Box Spoilers . The links in this post may be affiliate links. Read full disclosure Save for Later Notification Gain[z] Box released the first exclusive look of the March 2018 Brooke Ence X Gainz box! Check out the exclusive sneak peek here: Are you getting Gain[z] box this month?