Molasses is used to supply some simple sugars and micro nutrients like sulpher, magnesium, iron etc. Epsome salts will give calcium and magnesium as well as other micros. If you use epsom salt dont get the shit you soak ur feet in, go to some place like lowes or a garden store and get the salts for gardening. As far a molasses goes I use bryer Rabbit in the green jar, its never done me wrong and is found at wallyworld, although its sometimes hard to find b/c all the growers buy it up as soon as it hits the shelves.