Progesterone. Every kite needs wind. Estrogen needs to be sufficiently balanced by progesterone. Progesterone is the soothing compliment to the upper, all-business estrogen. Irregular cycles or you're on the rag more frequently than 5-10 years ago? Probably your ovaries making less of the stuff. Keeps you sleeping all night too.
Pregnenolone. Mother hormone of the whole fam, the matriarch, the precursor to absolutely every sex hormone. Involved in your memory, particularly word finding. Involved in keeping your vision in technicolor. Never heard of it? I know, me neither, until I did an advanced course with a very handsome fourth generation endocrinologist from Belgium, and let me tell ya, most European women have heard of it. Disappears when you are stressed.
Thyroid. Masta of metabolism. Keeps you energized, at a manageable weight (sans extreme measures that many of us in premenopause become reluctantly familiar with), and your locks glossy. Keeps your cholesterol reasonable. Keeps joints working well and pain-free. Keeps those finger and toenails from chippin'. Keeps mood and libido hummin' where it should.