
Peter Thomas Roth Professional Strength 3% Retinoid Plus is a product with 31 ingredients. Contains: Vitamins - Ascorbyl Palmitate (Vitamin C Palmitate); Antioxidant - Tocopherol, Ascorbyl Palmitate (Vitamin C Palmitate);
Organic score: 16% natural, 52% chemical. Vegan - No; Cruelty free - No; Reef safe - Yes;
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INCI - Full Breakdown
Cyclopentasiloxane is a fluid silicone. It’s non-greasy and doesn’t have any scent or color. It evaporates pretty fast which makes this ingredient essential when it comes to making products that have to dry quickly. It also gives a nice silky feeling when you apply the product to the skin and hair. It leaves a thin film that protects the skin after evaporation.
Cyclopentasiloxane is chemically neutral, meaning it doesn’t react with other components.
Ceramide NP is one of the most important ceramides found naturally in human skin. It plays a key role in maintaining a strong, healthy moisture barrier — the skin’s protective shield. When this barrier is damaged, skin becomes dry, irritated, and more sensitive. It helps restore that balance.
In skincare formulas, the component works by filling in the microscopic gaps between skin cells, much like mortar between bricks. This strengthens the outer layer of the skin, reduces moisture loss, and enhances overall resilience. Products containing Ceramide NP are especially beneficial for dry, sensitive, or compromised skin, including conditions like irritation from over-exfoliating or cold weather exposure.
Its biggest advantage is biocompatibility: Ceramide NP closely mimics the skin’s own natural ceramides, making it highly effective and well-tolerated. When combined with cholesterol and fatty acids, its performance is even better, helping to rebuild the lipid barrier more efficiently.
Overall, Ceramide NP is a gentle yet powerful ingredient that supports long-term skin health by reinforcing hydration, smoothing texture, and improving the skin’s ability to protect itself.
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