Phase-Specific Skin: How Biology Changes Your Sebum Levels

Why is your skin "Glassy" one week and a "Grease-ball" the next? It’s not your skincare—it’s your Internal Sebum Clock.

Skin biology is deeply tied to Androgens and Estrogen. When these levels shift, the "Viscosity" and "Volume" of your skin oil shift with them.

The High-Estrogen Phase: "The Plump"

During your follicular phase (early cycle), Estrogen is high. Estrogen suppresses sebum production and increases Hyaluronic Acid in the dermis.

• The Result: Your skin feels firm and looks "Clear."
• The Logic: Use this time to "Feast" on actives like Vitamin C and Retinal. Your skin can handle the stimulation.

The High-Progesterone Phase: "The Thickened Oil"

As you move toward your luteal phase (late cycle), Progesterone rises. This causes the skin to swell slightly, which can physically squeeze the pore openings. Simultaneously, your sebum becomes "stickier."

• The Result: You feel "congested" and "greasy."
• The Logic: Switch to Heartleaf and Double Cleansing. You need to focus on "Fluidity"—keeping that sticky oil moving out of the pore before it becomes a block.

The Low-Everything Phase: "The Sensitivity"

Just before your cycle starts, all hormones drop. This causes a sudden dip in the skin's barrier lipids.

• The Result: Skin feels "Reactive," "Stingy," and "Dull."
• The Logic: This is your Ceramide "Flood" week. Stop trying to "fix" things and start "protecting" things.

Final Thought: If you find that a product "stopped working," it might just be the wrong phase of the month for that specific active. Don't throw it away—just wait 10 days and try again.