A love potion refers to any type of chemical or magical element that is capable of making someone fall in love with the one who administers the potion.
The tears of Elasian females, when in contact with males, were biochemically capable of acting as a love potion, making them easy to enslave males. (TOS: "Elaan of Troyius")
Harry Mudd had a love potion crystal that he got from a Sirius medicine man. (TAS: "Mudd's Passion")
A love philtre was a magical type of love potion used by the Megans. (TAS: "The Magicks of Megas-Tu")