Several distinct collagen types exist, and which type predominates varies by tissue source, whether skin, tendon, cartilage, or the gelatinous matrix inside the umbilical cord. Collagen content is measured in a laboratory rather than estimated, and figures can vary with donor, recovery timing and processing method.
A 2021 study examined colony-forming potential and protein composition of five commercial umbilical cord allograft products and found no colony-forming mesenchymal stromal cells in those samples. That finding does not establish collagen-specific results, processing causation, lot-to-lot variability, or a conclusion about every supplier's manufacturing practice; it describes what was measured in the products that study tested.
A buyer comparing Wharton's jelly products should treat any published collagen figure as a composition detail to verify against the lot certificate of analysis, rather than as an indicator of how a product will perform once a clinician uses it. Supplier literature describing collagen content addresses matrix makeup, not a claim about clinical effect.
Separating matrix protein content from cell-based claims helps a buyer interpret a Wharton's jelly composition sheet without over-reading it.