Freshly-Squeezed Lemonade

While consuming this item, an animation of a cartoon heart is displayed above your character and a short, tinging sound will repeat.

Source
This item can be purchased for from:
 * in Stranglethorn Vale
 * in Mulgore
 * in Teldrassil
 * in Dun Morogh
 * in Tirisfal Glades
 * in Eastern Plaguelands
 * in Stormwind City
 * in Durotar
 * in Silithus

These vendors are made available to characters that have completed a corresponding quest from the Correspondence from the Front quests.