vitamin-c-serums
C-Firma Fresh Day Serum
This serum perfectly aligns with the 'Duke Parameters,' utilizing 15% L-Ascorbic Acid, 1% Vitamin E, and 0.5% Ferulic Acid at an ideal pH of 2.5. Its innovative 'liquid-to-powder' mixing system and airless pump effectively solve the oxidation issues common in the category, though it carries a premium price tag compared to budget competitors.
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CeraVe
Hydrating Facial Cleanser
Contains ceramides and hyaluronic acid. Gentle, non-stripping, maintains skin barrier. Dermatologist-developed and recommended.
Differin
Adapalene Gel 0.1%
Only prescription-strength retinoid available OTC. FDA-approved for acne. Less irritating than tretinoin. Direct retinoic acid receptor binding—no conversion needed.
EltaMD
UV Clear Broad-Spectrum SPF 46
Widely considered the gold standard for sensitive and acne-prone skin, utilizing high-purity transparent zinc oxide combined with niacinamide to calm inflammation. It is one of the few sunscreens that consistently maintains a high-performance profile without triggering breakouts or leaving a heavy residue.
La Roche-Posay
Anthelios Melt-in Milk Sunscreen SPF 60
This product consistently achieves perfect scores in independent lab testing for actual SPF delivery versus labeled SPF. Its Cell-Ox Shield technology provides a potent antioxidant complex that mitigates free radical damage beyond just UV filtration.