Molecular size is one way to describe collagen peptides. It can help characterise an ingredient, but a smaller number is not enough to prove better absorption or a stronger result for a customer.
What the measurement describes
Hydrolysed collagen contains a distribution of peptide sizes. A quoted average does not mean every peptide has that size, and specifications need to describe the actual ingredient.
Digestion still happens
Oral protein is broken down during digestion. Ingredient peptide size is not the same as evidence that intact material reaches a particular body tissue.
What a comparison would need
A reliable claim that one preparation outperforms another needs a suitable direct comparison with relevant outcomes. A general mechanism, source claim or supplier number does not establish that conclusion.
What else to read
Check source identity, declared collagen amount, full formula, allergens and available ingredient evidence. Use molecular size as one detail in that assessment rather than a shortcut to choosing.
