The ABCs of Skincare: Why Vitamins A, B, and C Belong in Every Protocol
From the Desk of Dr. Loretta Ciraldo, MD, FAAD
Great skincare isn't about chasing trends — it's about mastering the fundamentals and formulating them better than anyone else. That's the philosophy I've built my entire practice on, and it's a big part of why three vitamins keep showing up across the Cosmedical lineup: A, B, and C. They're the vitamins with the deepest, most consistent body of clinical evidence in dermatology, and together they address nearly every concern that walks through my door — aging, tone, texture, barrier health — backed by decades of research behind every claim.
Here's why each one matters, and how I've engineered them into formulas my patients actually stay loyal to.
Vitamin A: The Gold Standard, Made Tolerable
Retinoids are the most extensively studied anti-aging ingredient in dermatology — clinically shown to boost collagen production, slow its breakdown, and speed up cell turnover for smoother texture, fewer fine lines, and more even tone.[^1][^2] The catch has always been tolerability: higher concentrations work, but they also strip lipids and disrupt the barrier, leaving patients with the redness and flaking that make them give up. I engineered around that at every level of my vitamin A line:
-
Advanced Retinol, a 0.5% all-trans retinol treatment serum, is formulated with built-in lipid replacement — so in clinical testing, testers saw excellent improvement in lines, wrinkles, and pigmentation with minimal to no peeling or dryness.
-
Complexion Renewal Oil offers a gentler path in for retinol-sensitive skin, featuring Rock Samphire (Crithmum maritimum), clinically shown to visibly brighten, smooth, and diminish fine lines while balancing oil and preventing moisture loss — ideal for refining pore appearance without dehydrating the skin.
-
Multi-Complex Night Crème features Hydroxypinacolone Retinoate (HPR), a gentle vitamin A derivative that promotes cell turnover with virtually no irritation — making it a fit for sensitive, mature, and hormonal skin alike.
-
Advanced Retinol Eye delivers encapsulated, micro-dosed retinol for controlled release in the delicate eye area, paired with Rock Samphire to visibly reduce wrinkles, fine lines, and hyperpigmentation.
Vitamin B: The Barrier Builder
If vitamin A is the workhorse, vitamin B is the peacekeeper. Niacinamide (vitamin B3) has one of the most robust clinical evidence bases in cosmeceutical dermatology — shown to calm inflammation, strengthen the skin's barrier, and improve pigmentation at well-tolerated concentrations.[^3][^4] It's the ingredient that lets me push other actives harder, because it's quietly reinforcing the barrier underneath.
-
Vita-B Enzyme Polish combines niacinamide with Panthenol (vitamin B5) — niacinamide visibly reduces enlarged pores, evens dull or uneven tone, boosts barrier strength and hydration, and reduces free-radical damage linked to redness and aging, while panthenol draws in and locks down moisture to promote healing and softness.
-
Boost+ Essence pairs niacinamide with Ectoin, a marine-derived extremolyte first identified in the Egyptian desert in 1985, prized for its ability to hold onto water in the harshest conditions. The synergy between the two ingredients makes this formula an absorption booster — priming skin so the rest of a patient's regimen performs better.
Vitamin C: The Antioxidant Powerhouse
Vitamin C's reputation is well-earned: as one of skin's most powerful antioxidants, ascorbic acid neutralizes free-radical damage, fuels collagen synthesis, and inhibits the enzyme behind excess pigment.[^5] The challenge has always been stability — pure L-ascorbic acid is notoriously difficult to formulate without it breaking down.[^6] That's why I offer a tiered vitamin C system, so every skin type has an entry point.
-
Vita-C Peptide Spray features Magnesium Ascorbyl Phosphate, a water-stable form of vitamin C that boosts elasticity and brightens, paired with a Red Algae peptide that supports collagen production and hydration for a firmer, plumper look.
-
C-Stem® uses TetrahexylDecylAscorbate, a non-irritating, deeply penetrating vitamin C derivative, combined with gene modulators that lower Progerin — the protein linked to skin aging. In clinical testing, this formula increased skin elasticity by an average of 53% within 8 weeks, alongside a significant decrease in lines, wrinkles, and hyperpigmentation.
-
Vita-C 20 delivers 20% L-ascorbic acid in a rich, high-stability cream — an aggressive option for hyperpigmentation, lines, and wrinkles. It should always be layered over a prepping serum like Lipid Drops or Vita Soothe, and it isn't recommended for red, sensitive, or post-procedure skin. In my own practice, it has shown unparalleled results when used on hands and chest — firming skin and fading solar lentigines.
Building a Protocol That Actually Works
The science is clear: A, B, and C aren't competing ingredients — they're complementary systems. Vitamin A drives renewal, vitamin B protects the barrier that makes renewal sustainable, and vitamin C defends against the oxidative damage that undoes it all. Layered thoughtfully, they deliver results serums alone can't reach — and that's exactly what I formulate for.
Dr. Ciraldo is the founder and lead formulator behind Cosmedical's medical-grade skincare line. Partners Beyond Product™.
Introduce the ABCs Into Your Skincare Protocol
Explore our dermatologist-formulated Vitamin A, B, and C collections and find the right formulas to support renewal, barrier health, antioxidant protection, and healthier-looking skin.
References
[^1]: Clinical review of retinoid mechanisms and efficacy, Preprints.org, 2025. [^2]: Human Skin Aging and the Anti-Aging Properties of Retinol, MDPI Cosmetics, 2023. [^3]: Boo, Y.C. Mechanistic Basis and Clinical Evidence for the Applications of Nicotinamide (Niacinamide) to Control Skin Aging and Pigmentation, Antioxidants, 2021. [^4]: Niacinamide efficacy in skin therapy literature review, Cosmoderma, 2026. [^5]: Topical Vitamin C and the Skin: Mechanisms of Action and Clinical Applications, Journal of Clinical and Aesthetic Dermatology. [^6]: Vitamins and the Skin: Vitamin C in Dermatology, Clinics in Dermatology, 2026.
