Rona, Author at Q Calculus

What Retinol Actually Does to Your Skin

Retinol is the most evidence-backed anti-ageing active available without a prescription. Here is the mechanism, the conversion pathway, and what the research…

May 12, 2026 4 min read

Beauty Science

Actives

Retinol vs Tretinoin: Why One Is Prescribed and One Isn’t

Tretinoin is retinoic acid - the active form of vitamin A. Retinol has to be converted to it. That conversion gap explains…

May 12, 2026 4 min read

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What Retinol Actually Does to Your Skin

Retinol vs Tretinoin: Why One Is Prescribed and One Isn’t

Ingredient Intelligence, Weekly