Collagen
Collagen is the main structural protein in skin, bone, tendons and cartilage. Supplements usually contain hydrolyzed collagen from cattle, pigs or fish.
Also listed as collagen peptides, hydrolyzed collagen, multi collagen, bovine collagen
Peptides and undenatured collagen are different products
Hydrolyzed collagen, often called collagen peptides, was used in the skin trials. Many tested daily amounts such as 2.5, 5, or 10 g, over weeks rather than days. The knee-flexibility trial used a 40 mg undenatured type II preparation. These study amounts are not interchangeable recommendations. 1 2
What does a vitamin claim prove?
A beauty product may carry an authorized claim for an added nutrient such as biotin. That does not demonstrate that its collagen improves skin appearance. Verbraucherzentrale also cautions that products marketed as plant collagen are generally amino-acid mixtures rather than collagen. 3
Sources
- UC-II Undenatured Type II Collagen for Knee Joint Flexibility: A Multicenter, Randomized, Double-Blind, Placebo-Controlled Clinical Study Journal of Integrative and Complementary Medicine, 2022 · Study record
- Kollagendrinks für die Schönheit: Beauty aus der Büchse? Verbraucherzentrale