Collagen: what it is and how supplements differ

Collagen is the most abundant protein in the human body and the main structural component of skin, tendons, ligaments and bone. It is also one of the most heavily marketed ingredients in beauty, which makes a plain description of what is in the tub genuinely useful.

Hydrolysed collagen and peptides

Intact collagen is a large, tough molecule. Most supplements therefore use hydrolysed collagen, where the protein has been broken into shorter fragments called peptides so it dissolves in liquid and is easier to consume. 'Collagen peptides' and 'hydrolysed collagen' usually describe the same thing; 'collagen protein' on a sports label may mean the same material sold for a different audience.

Types I, II and III

Labels often name a collagen type. Types I and III are associated with skin, bone and connective tissue and are what most beauty-oriented products supply. Type II is found in cartilage and appears in joint-focused formulas, frequently from chicken sources. A product listing 'types I & III' is describing its raw material, not making a promise about results.

No collagen supplement is vegan, because collagen is an animal protein. Products described as 'vegan collagen' are usually collagen-builder formulas supplying nutrients such as vitamin C rather than collagen itself — a legitimate product category, but a different one, and the label should say so clearly.

Comparing servings honestly

Powders are typically sold in servings of several grams, capsules in far smaller amounts, which is why the two formats are hard to compare at a glance. Work out grams of collagen per serving and the number of servings in the pack; that single calculation explains most price differences on a shelf.

• Grams of collagen per serving, and how many scoops or capsules that is.
• Source and type, if either matters to you.
• Added ingredients: vitamin C, flavourings, sweeteners, hyaluronic acid.
• Whether the flavour and texture suit how you will actually drink it.

Realistic expectations

Research on collagen peptides and skin is ongoing and results vary between studies, so an honest article does not promise a visible change on a timetable. What is reasonable to say: collagen powder is a protein supplement, it is not a medicine, and it sits alongside sun protection, sleep and a varied diet rather than replacing them.

The bottom line

Read the tub as you would a protein powder: grams per serving, source, type, extras, servings per pack. That is the comparison that tells you what you are buying.

This article is educational. Food supplements are not a substitute for a varied diet or medical care. Speak to a healthcare professional about your own situation.