Skin is not static. It changes throughout the month, following the rhythm of the menstrual cycle, responding to the fluctuations of estrogen, progesterone, and androgens that define each phase. Anyone who has noticed that their skin is different in the week before their period than in the days after is not imagining things: they are observing real hormonal biology.
The 4 phases of the cycle and how the skin changes in each one
The follicular phase (approximately days 1-14) is dominated by the progressive increase in estrogen. In the skin, estrogens stimulate the synthesis of collagen and hyaluronic acid, improve hydration, and produce an effect of greater luminosity and smoothness. Many women report that their best "skin day" is around ovulation (day 14), when estrogen levels peak.
The luteal phase (days 14-28) is dominated by progesterone and, towards the end, by a drop in both hormones. Progesterone stimulates the sebaceous glands, increasing sebum production. Androgens — which also fluctuate — enhance this effect. The result is oilier skin, more prone to clogged pores and acne breakouts in the days leading up to menstruation. Greater skin reactivity in this phase is also characteristic.
Estrogens, progesterone, and androgens: direct skin effects
Estrogens have receptors in dermal fibroblasts and directly regulate the synthesis of collagen, elastin, and hyaluronic acid. Progesterone has receptors in sebocytes and regulates sebum production. Androgens — mainly testosterone and DHEA — activate androgen receptors in the sebaceous glands, increasing sebum production and follicular inflammation. The interaction between these three pathways defines skin behavior in each phase of the cycle.
Skin in the luteal phase: inflammation, hormonal acne, and fluid retention
The luteal phase is the most demanding phase for the skin of many women. Excess sebum, increased bacterial activity, follicular inflammation, and fluid retention — mediated by progesterone — create the biological context for premenstrual hormonal acne. Zinc has documented activity in regulating sebaceous activity and follicular inflammation, which partly explains why it is a mineral of particular relevance in the context of hormonal skin care.
Why constant supplementation is more effective than cyclical supplementation
Unlike hormonal medications that can be adjusted according to the cycle phase, nutricosmetics work more effectively with sustained and constant exposure. Active ingredients that work on collagen synthesis, dermal hydration, or inflammaging need to be continuously available to act on the underlying biology. Supplementation taken only in certain phases of the cycle does not allow for achieving or sustaining the plasma levels necessary for the documented effect in studies.
