The last item is talking about CSF or cerebrospinal fluid. CSF is taken, for instance, in a spinal tap. The fluid is then replenished ("regrown") by the body. Adrenochrome is made from the adrenal gland, which does not spontaneously regenerate.

The last item is talking about CSF or cerebrospinal fluid. CSF is taken, for instance, in a spinal tap. The fluid is then replenished. Adrenochrome is made from the adrenal gland, which does not spontaneously regenerate.