Ceramide Capsules (Phytoceramides)

Ceramide capsules (phytoceramides) are lipid-based dietary supplements derived primarily from plant sources such as rice bran, wheat, or sweet potato. They are not a significant source of macronutrients, calories, or traditional vitamins/minerals. Key bioactive compounds include: Phytoceramides (glucosylceramides): typically 30–40 mg per capsule (standard therapeutic dose), comprising sphingolipid species with fatty acid chain lengths of C16–C24, predominantly C18 glucosylceramides. Sphingoid bases: phytosphingosine and dihydrosphingosine, which are the backbone structures released upon digestion. Associated plant lipids: small amounts of glycosphingolipids, phospholipids, and trace sterols depending on extraction source. Bioavailability notes: Orally ingested phytoceramides are hydrolyzed in the intestinal lumen by glucocerebrosidase and ceramidase into sphingoid bases and free fatty acids, which are absorbed and re-synthesized into ceramides in enterocytes before entering systemic circulation via lymphatic transport. Bioavailability is moderate (~10–20% of intact sphingolipid reaching dermal layers); rice-derived phytoceramides show slightly superior absorption compared to wheat-derived forms. Some formulations include added Vitamin E (d-alpha tocopherol, ~10–15 IU), Vitamin A (as beta-carotene or retinyl palmitate, ~600–1000 IU), Vitamin C (~20–30 mg), and Vitamin D (~200–400 IU) to synergistically support skin barrier function and antioxidant defense. Capsule excipients typically include medium-chain triglycerides (MCT) or safflower oil as carriers to enhance lipophilic absorption. No significant protein, fiber, or mineral content. Caloric contribution is negligible (<5 kcal per capsule).