Also, ES2, your healing potion was called a "draught of the green" by the old herb-woman you bought it from. She said she made it from some specially prepared herbs that grow in particular places. She was willing to sell it to you because she held an odd fascination for the mojh. Mostly she only used it amongst people of her community.
Game mechanic-wise, it works the same as a CLW potion, curing 1d8+1 points of damage.