Fish oil.To treat cardiovascular-related illnesses.And $AMRN - Amarin is now a $5.75 billion company. Just weeks ago, the stock traded in the $2.35 range. It closed at $19.80 but volume tailed off at the top. $AMRN, Amarin Corporation plc / H1 $ARNA joined the ride but, it, too, will fall. $ARNA, Arena Pharmaceuticals, Inc. / H1 SELL $ARNA, $AMRN.Agree or disagree? Login now to vote. Join the group of Value Stocks. 'Ping' to ~850 members. Comment below.