The Study
Effect of Reducing Pigmentation by Collagen Peptide Intake: A Randomized, Double-Blind, Placebo-Controlled Study
This study is like a careful test where some people took a collagen supplement and others took a fake pill. It shows that taking the supplement might help reduce dark spots and redness on the skin after three months. However, because it only tested a small group of people for a short time, we can't be completely sure it will work exactly the same way for everyone.
Analysis score
Maximum 90 for a randomized controlled trial.
Where the score came from
Researchers tested if drinking 5 grams of regular or fermented collagen daily helps fade dark spots and redness on the face.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 560 / 100
Quality score
Participants are randomly assigned to treatment or control groups, minimizing bias. The gold standard for testing whether an intervention causes an effect.
Key takeaways
Summary
Based on the study abstract and findings.
- 1Yes, the changes were statistically significant and visible within a few months, suggesting a practical, non-invasive way to improve skin tone.
- 2After 1-3 months, people taking collagen had fewer and smaller dark spots and less facial redness compared to those taking a placebo.
- 3No side effects were reported.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Dermatology and Therapy
Year
2022
Authors
Aiko Himeno, Masaya Tsujikami, Seiko Koizumi, Toshiro Watanabe, M. Igase
Related Content
Claims (6)
Taking 5 grams of collagen supplements every day for three months is safe for healthy adults and doesn't cause any side effects or unwanted changes to your body or skin. This means you can use them for short-term skin benefits without worrying about harming your overall health.
Taking 5 grams of a special fermented collagen supplement every day can help fade dark spots on your face. You might start seeing results in just a month, and it works just as well or even better than regular collagen supplements.
Taking 5 grams of collagen pills every day for three months might help reduce redness in your face and make your skin tone look more even. This could happen because the collagen calms inflammation or changes how blood flows to your skin.
Taking 5 grams of pig collagen pills every day for one or two months can visibly reduce dark spots and patches on the face. This happens because the collagen helps regulate how your skin produces pigment, leading to a clearer complexion.
Taking collagen supplements may help lighten dark spots on your face. Instead of directly blocking pigment production, the special proteins in collagen appear to boost skin cell growth and repair, which gradually improves your skin's overall appearance.
Taking collagen supplements can help keep your hair roots strong and healthy by protecting them from damage. This protection may also help your hair keep its natural color longer.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.