Can pregnant women drink sea coconut syrup?

Why?: African Sea Coconut has Slippery Elm bark as an active ingredient. Used for cold symptoms, phlegm and sore throat. Slippery elm has not been well-studied. There are many well studied medications available for congestion and cold symptoms in pregnancy. I would not recommend use of slippery elm in pregnancy. It is traditionally thought to cause miscarriages. That too has not been studied.