Most of the studies around cacao are pretty impressive -- they so consistently show benefits for the heart and brain and skin along with antioxidant and other benefits that even the medical community has taken note and become interested in how cacao may be used.
And while you may want these benefits to come packaged in a delicious chocolate bar, you may also want to avoid the sweeteners and extra calories found in chocolate. And that's where cacao supplements may come in handy!
In fact, you can get just cacao powder (for drinks or recipes) or cacao nibs to chew on, but you can also get cacao in capsule / tablet form. At the time of this writing, you can get some basic cacao capsules for as little as $5.99 with Prime shipping from Amazon (see image link on this page), but you can look through several cacao supplements on this page.
There's one specific supplement worth calling attention to because it also offers a broader range of nutrients, which I've said is more important than getting all your nutrients from cacao.
Cocoawell is a line of organic cocoa based products combined with their "Pure Plant Flavanol" complex. The True Energy formula includes additional plant ingredients including a tea extract, which no doubt adds some caffeine to help give you a boost.
I've used a cacao based supplement in the past that also had some caffeine (used rarely, but great for long car drives for instance) that gave me some added steam without jitters -- I suspect because it was balanced with theobromine (from the cacao) and other nutrients, but of course everyone's experience is different with this sort of thing. Still, if you need an energy boost and don't mind the caffeine (do consider whether you've had caffeine from other sources first!), this could be worth checking out.
In any case, the overall Cocoawell line that I've linked to is pretty interesting as a broader based of nutrients along with the organic cocoa.