You can make your own chocolate syrup with cacao powder, sugar, milk or water, and vanilla extract. Bringing this to a boil and reducing it allows it to become a syrup. The stearic acid in cacao butter can help a lot with your metabolism as it is dopaminergic (I think), increases mitochondrial fusion, and lowers cancer risk. +1 for the heavy metals as chocolate can be high in cadmium and aluminum. The polyphenols in chocolate can also help with digestion as it acts as a prebiotic (at least in pigs.)