The science
As a repair cream, the dependable science is the barrier-lipid system: ceramides NP and NG supplied with cholesterol, phytosphingosine, shea and squalane provide physiologic barrier lipids, and replenishing them in balance is a well-established way to reduce transepidermal water loss and support compromised, mature skin. The peptide complex (copper tripeptide-1, oligopeptides, acetyl hexapeptide-8) has supportive evidence for matrix support and the appearance of firmness, and niacinamide is robustly documented for barrier and tone. The headline NAD+ (nicotinamide adenine dinucleotide) is central to cellular energy metabolism and an active research focus, but evidence specifically for topical NAD+ penetrating skin and delivering anti-aging repair remains early and limited, so its real-world role here is promising rather than established. The 'Jayoon Collagen' concept — hydrolyzed collagen with black truffle (Tuber Melanosporum) extract and rosmarinic acid — functions as a humectant and surface conditioner; topical collagen does not replace dermal collagen, and the truffle and uptake-enhancer claims are not robustly substantiated, so this contributes feel and finish more than structural change. The hanbang botanical and quercetin-rich crowberry complexes supply antioxidants with in-vitro activity on a traditional-use basis. The formulation trade-off is the fragrance with multiple allergens plus warming botanicals (cinnamon, ginger), all documented sensitizers in a leave-on product. In sum, a genuinely strong ceramide-and-peptide repair cream carrying an unproven NAD+ headline and a luxurious herbal-and-collagen layer.