Used Velvet mystery gift thrice.

On second and third attempts my health didnt increase to 24k and or 72k.

But its still used the velvet gift and increased my cooldown.

Also its mentioned that on the item description its used booster instead of medical cooldown.

If it shouldnt be stackable please atleast disallow the use of the item? 

Fair enough; i am just wondering what made you think it was stackable?? 72k health would be pretty rediculous. 

i think it will only increase to 3 times your normal max life. having said that, to get your 24K life points, your normal life should be at 8K. 72K is impossible.