Pregnenolone comes from the outer part (cortex) of the adrenal glands and brain. It is particularly concentrated in the latter.
It stimulates the memory, clarifies thoughts and intensifies concentration, reduces fatigues and fights depression. It also helps to cure nerve lesions and alleviates inflammatory rheumatism and arthritis.
As in the case of other adrenal hormones, you should eat animal proteins and fat (not burnt).