What it is
Powdered charred carbon, used to dye foods black — the goth-ice-cream pigment, riding a "detox" halo it doesn't earn.
Why your biology objects
It genuinely adsorbs — it's the ER's poison-control decontaminant — so it can bind drugs and nutrients in your gut, including reducing absorption of medications like oral contraceptives if taken together. A purely cosmetic colorant (not even US-approved) carrying a real interaction concern.