like most vendor potion it adds a negative effect... it heals you but DONT use it in a fight it does exactly what its message indicates... Your mind reels as your body begins to heal... for a short time you cant do ANYTHING run fight cast nothing! i guess it is only good when in offtime or as a newbie and being low on hp waiting to regen just pop one of these go ****** for about 15-30 seconds and i think ur hp is full