Skin Bio Blog

Skincare

Physician-led guidance on medical aesthetics, skin health and regenerative medicine — written by the clinicians at Skin Bio in Calabasas, not a marketing team.

Skin Bio retinol and bakuchiol serum in a black glass dropper bottle

Retinol vs. Tretinoin: How to Start Without Wrecking Your Skin

Cristina Borhani, MSN, NP September 20, 2026

A nurse practitioner explains retinol vs. tretinoin, which one to start with, and the four-week protocol that keeps you from quitting.

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The Skincare Routine I Actually Use in the Southern California Sun

Cristina Borhani, MSN, NP September 16, 2026

A Calabasas nurse practitioner shares the morning and evening routine she uses in Valley heat and extreme UV, with the evidence behind each step.

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Skin Bio Blog

Skincare

Retinol vs. Tretinoin: How to Start Without Wrecking Your Skin

The Skincare Routine I Actually Use in the Southern California Sun

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