The foundations of healthy glowing skin - Part 3 Hormones, Stress & Skin

Skin is a living organ that responds to internal changes as much as external ones. While skincare routines play an important role in maintaining barrier function and hydration, hormonal fluctuations and stress levels often determine how stable, reactive, or unpredictable the skin becomes.

Hormonal changes during pregnancy, postpartum, menstrual cycles, and stressful periods influence oil production, barrier strength, inflammation, and pigmentation. This article explores the biology behind these changes and outlines evidence-based ways to support the skin through these shifting seasons.

 

How stress affects the skin: The role of Cortisol

The body releases cortisol as part of its stress response. Although cortisol is essential for survival, chronically elevated levels disrupt multiple processes in the skin.

Research shows that high cortisol can:

Increase oil production
Cortisol stimulates the sebaceous glands, increasing sebum levels and raising the likelihood of congestion and breakouts.

Weaken the skin barrier
Elevated cortisol reduces the production of ceramides, cholesterol, and fatty acids — the lipids that form the skin’s protective barrier. This leads to increased transepidermal water loss (TEWL) and dryness.

Reduce collagen synthesis
Cortisol interferes with fibroblast activity, slowing collagen production and accelerating the visibility of fine lines.

Increase inflammation
Chronic stress upregulates inflammatory pathways in the skin, contributing to redness, sensitivity, and slower healing.

Delay wound repair
Several studies have shown that stress delays the skin’s natural recovery processes, meaning breakouts take longer to settle and barrier damage takes longer to heal.

These combined effects explain why during periods of stress the skin often appears dull, dry, reactive, or blemish-prone, even when skincare habits remain consistent.

 

Pregnancy Hormones and their impact on the skin

Pregnancy significantly alters endocrine activity. Rising levels of estrogen and progesterone lead to noticeable changes in the skin’s appearance and behaviour.

Common research-supported effects include:

Increased sensitivity
Higher vascular reactivity and a more delicate barrier make the skin more prone to stinging and irritation.

Changes in pigmentation
Estrogen boosts melanocyte activity, increasing the risk of melasma (hormonal pigmentation). UV exposure intensifies this response.

Altered oil production
Some women experience increased oiliness and congestion, while others develop dryness depending on how hormones interact with their baseline skin type.

Increased redness or rosiness
Enhanced blood flow can lead to visible flushing or general warmth in the complexion.

Enhanced hydration levels
In some cases, water retention and improved circulation result in the well-known “pregnancy glow.”

A consistent, gentle routine becomes essential during this phase, as many active ingredients (e.g., retinoids, high-dose chemical exfoliants) are not recommended.

Postpartum skin: why it becomes unpredictable

After birth, hormone levels drop sharply, particularly estrogen. This sudden shift, combined with sleep disruption and the physical demands of caring for a newborn, contributes to a unique period of skin instability.

Postpartum studies highlight several common outcomes:

Dryness and dehydration
Lower estrogen reduces hyaluronic acid and lipid production, weakening the barrier and increasing TEWL.

Increased sensitivity
A compromised barrier paired with lack of sleep makes the skin more reactive to ingredients it previously tolerated well.

Breakouts or congestion
Postpartum androgen fluctuations can increase sebum levels, while stress-related cortisol spikes exacerbate inflammation.

Dullness and uneven tone
Slower cell turnover and reduced collagen activity contribute to a fatigued appearance.

Many women feel their skin becomes “completely different” during this period, a normal response to interconnected hormonal, biological, and lifestyle pressures.

Sleep, skin repair & hormonal regulation

Sleep is when the skin shifts into repair mode. During deep sleep, blood flow increases, cell turnover accelerates, and the barrier rebuilds itself. Poor sleep, especially fragmented sleep, as experienced postpartum or during high-stress periods, has been shown to:

• Increase visible signs of ageing
• Impair barrier function
• Reduce moisture retention
• Slow collagen regeneration
• Heighten inflammation

This is why even the most effective products cannot fully compensate for chronic sleep deprivation. Simple, consistent routines become especially important in these phases.

Healthy-looking skin during these seasons is not about perfection, it is about supporting the skin’s natural functions, strengthening the barrier, and choosing routines that work with the body rather than against it.

Busy and looking to support your skin through all seasons and what hormones will through at you? Be on the lookout for our next drop here!