from Dr Lam, this is actually for women, but maybe it's similar for men?
"Some with Adrenal Fatigue find pregnenolone replacement improves their energy, vision, memory, clarity of thinking, well being, and often sexual enjoyment or libido. Some women report lessening of hot flashes or premenstrual symptoms and this is likely due to the rise of progesterone (the biological daughter of pregnenolone) reduction in estrogen dominance. Others, however, may find pregnenolone worsen existing fatigue and may even trigger adrenal crashes. Such paradoxical reactions are common. The more advanced the adrenal weakness, the more likely such experiences are common."