Research
Collagen Research
Plain-language summaries of the published collagen research. Every summary links to its primary sources, and we never present popularity as evidence.
Collagen and Bone Density
Research summary of randomized-trial and meta-analytic evidence on collagen peptides and bone mineral density, including the dose studied, the populations involved, and the limitations of the current evidence.
Published June 22, 2026Read the research →Collagen and Cellulite
What current human research does and does not show about oral collagen peptides and the appearance of cellulite, including the dose studied, who was studied, and the limits of the evidence.
Published June 22, 2026Read the research →Collagen, Hair and Nails
An evidence-first look at what human studies actually measured when oral collagen peptides were tested for nails and hair, including a 12% nail-growth signal from a small open-label trial and the sparse, indirect nature of the hair evidence.
Published June 22, 2026Read the research →Collagen and Joint Pain
Two meta-analyses of randomized controlled trials report that oral collagen supplements modestly reduce pain and improve function in osteoarthritis, with no increase in adverse events compared with placebo.
Published June 22, 2026Read the research →Collagen and Muscle Mass
What the current human evidence says about collagen peptides, resistance training, and changes in muscle and fat-free mass.
Published June 22, 2026Read the research →Collagen Types Explained
A plain-language explainer of the main collagen types, where they occur in the body, and what hydrolyzed collagen peptides are, grounded in two peer-reviewed reviews.
Published June 22, 2026Read the research →Does Collagen Get Absorbed?
A plain-language look at whether collagen is absorbed. Human pharmacokinetic studies show that hydrolyzed collagen peptides, including hydroxyproline-containing di- and tripeptides, appear in the bloodstream after intake.
Published June 22, 2026Read the research →How Much Collagen Per Day?
An evidence-first look at how much collagen has been studied per day, drawing on two meta-analyses of randomized controlled trials of oral hydrolyzed collagen and its effects on skin hydration and elasticity.
Published June 22, 2026Read the research →Marine vs Bovine Collagen
An evidence-first look at how marine and bovine collagen differ as source materials, and what current reviews do and do not establish about whether one is better.
Published June 22, 2026Read the research →Collagen Peptides, Skin Hydration and Elasticity
In adults, pooled randomized-trial evidence suggests oral collagen peptide supplementation may modestly improve skin hydration and elasticity.
Published June 19, 2026Read the research →