Progesterone Support

Progesterone is produced by the corpus luteum after ovulation. It stabilises the endometrium for implantation, opposes estrogen's proliferative effect, raises basal body temperature and — via its neuroactive metabolite allopregnanolone — modulates GABA-A receptors, which is why the luteal phase influences mood and sleep so noticeably. Low luteal progesterone almost always reflects a problem with ovulation rather than with progesterone synthesis itself. Anovulatory cycles produce none at all. A short luteal phase, under ten days, suggests a poorly formed corpus luteum. The usual drivers are PCOS, hypothalamic suppression from low energy availability or heavy training, thyroid dysfunction, elevated prolactin and perimenopausal cycle irregularity. Chasing "low progesterone" without establishing whether ovulation happened, and when, is the most common mistake. Where an intervention helps, it usually helps by improving ovulation. Vitex lowers prolactin through pituitary dopamine receptors, which can lengthen an inadequate luteal phase and has repeatedly beaten placebo for PMS and cyclical breast pain. Vitamin B6 has modest support for premenstrual symptoms. Correcting hypothyroidism, restoring adequate energy intake, and managing chronic stress address the upstream cause. Prescribed progesterone remains the appropriate route in confirmed luteal phase deficiency and in fertility treatment.

Establish whether you ovulate and when, using LH testing or basal body temperature, before doing anything else — this determines both the diagnosis and the correct blood draw timing. Screen for and treat the upstream causes: thyroid dysfunction, elevated prolactin, and PCOS. Restore adequate energy availability if training volume is high or intake is low, since hypothalamic suppression is a frequent and fully reversible cause of anovulation. Address chronic stress and sleep, which act on the same hypothalamic pathway. Where PMS symptoms or a short luteal phase are the concern, vitex at 20 mg of a standardised extract taken continuously has randomised support, judged after three cycles; vitamin B6 up to 100 mg daily has modest evidence for premenstrual symptoms and should not be exceeded because of neuropathy risk at higher chronic doses. Do not combine vitex with dopamine agonists or use it in pregnancy. Confirmed luteal phase deficiency in the context of fertility treatment is managed with prescribed progesterone, not supplements.

• •Confirm ovulation before treating anything
• •Restore adequate energy intake if training volume is high
• •Maintain a stable body weight in the healthy range
• •Manage chronic stress, which suppresses the hypothalamic-pituitary-ovarian axis
• •Protect consistent sleep and circadian timing
• •Treat thyroid dysfunction and elevated prolactin
• •Moderate alcohol and avoid smoking, both linked to cycle disruption