BLACK MEDICINE is called ETU. In the USA, it is commonly known as activated charcoal, which is the powder form of a potent natural remedy. Activated charcoal is used to trap toxins and chemicals in the body, allowing them to be flushed out so the body doesn’t reabsorb them. It’s made from a variety of sources, but when used for natural healing, it’s important to select activated charcoal made from coconut shells or other natural sources.
Orisa Lifestyle makes regular use of etu [activated charcoal]. There are many verses of Ifa, wherein etu is prescribed. One of my favorite examples comes from the Holy Odu OgbeOyeku. Here, the Lion was not fierce. Nor was he the king of the jungle! Instead, the animals showed him nothing but disrespect. If the Lion fell asleep, they would walk right over him. Lion went to consult Ifa. He was told to sacrifice for glory and honor. The sacrifice included a calabash of water, activated charcoal, three clubs and herbs. They said he should crush the herbs in the water, add the charcoal and drink it. They instructed Lion to make a circle of urine around the spot where he planned to sleep. Any animal who entered that circle would surely fall dead. From that time one, the animals would not dare approach the Lion.
HOW DOES ACTIVATED CHARCOAL WORK?
When charcoal is activated, it is processed in a way to increase the porosity. Because of this, activated carbon will have a large surface area, which can adsorb substances effectively. This primarily increases its effectiveness as a filter. Activated charcoal is "activated" when it's processed at extremely high temperatures, which changes its internal structure, reduces its pore size and expands its surface area  It's not absorbed by your body, so it's free to carry surface-bound toxins from your body and dispose of them through bowel movements. It’s important to note that activated charcoal is not charcoal used in your barbecue grill! Barbecue charcoal is loaded with toxins and chemicals, and should never be consumed. 
Difference between Activated Carbon and Charcoal:
TOP USES OF ACTIVATED CHARCOAL
Whenever you take activated charcoal, it’s imperative to drink 12-16 glasses of water per day. Activated charcoal can cause dehydration if adequate amounts of water aren’t consumed in tandem. In addition, this helps to flush out the toxins quickly and prevents constipation experienced by some individuals.
Here are some uses of activated charcoal:
HOW TO USE ACTIVATED CHARCOAL
 Juurlink DN 2016 published in the Br J Clin Pharmacol titled Activated charcoal for acute overdose: a reappraisal.