“…Currently, a problem is that there are dozens of little startup companies producing pregnenolone and the slightest miscalculation or inefficiency in their chemistry can leave irritating or toxic contaminants in it. So you have to test any particular brand of pregnenolone that you get. Watch out for any hormonal symptom at all. It shouldn't be associated with pregnenolone. Nothing but an anti-stress effect should result from pregnenolone. No uterine or breast sensations, no changes of whisker growth or such. Progesterone is mainly produced by the biggest, oldest chemical companies.”