Stat Booster is the informal name for items that raise characters' stats (such as Max HP or Strength). However, they cannot increase stats beyond the Stat Caps. In general, they are rare and limited in number. In Fire Emblem: Thracia 776 and Fire Emblem: The Sacred Stones an unlimited number of them can be bought from Secret Shops, while in Fire Emblem: Shadow Dragon a limited number can be purchased. Starting in Fire Emblem: Path of Radiance, some may be equipped. The internal name for such items and which is also used by many Japanese fans is Doping Items.
The items that increase your stats are as follows: