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Randomized trial · measured the question itself

A 90-day trial of a collagen-blend drink in 120 adults found more skin elasticity

Czajka and colleagues · Nutrition research · 2018

Original title: Daily oral supplementation with collagen peptides combined with vitamins and other bioactive compounds improves skin elasticity and has a beneficial effect on joint and general wellbeing.

Under review. A person has not yet checked this summary against the paper. It is written from the PubMed abstract. Until a person checks it, search engines are asked not to list this page.

What the study found

Points to benefit

Skin elasticity rose +40% (P < .0001) compared with placebo. Skin samples showed better fiber layout. Joint pain fell by -43%.

The study at a glance

Type of study
Randomized trial
Who or what was studied
120 people · 120 adults
What was tested
A daily drink with fish collagen, vitamins, joint compounds and other ingredients for 90 days, vs placebo
What it measured
The question itself: skin wrinkles, elasticity and hydration
How long
13 weeks
Who has a stake
No disclosure in PubMed
No disclosure in PubMed.
Journal
Nutrition research, 2018
Source
PubMed record 30122200. This page is based on the abstract only.

How much this study counts

  • ✓Randomized: people were put into groups by chance, so the groups start out alike.
  • ✓Compared with a placebo, a dummy treatment.
  • •Medium size: 120 people.
  • •Lasted 13 weeks.
  • ✓Measured the question itself: skin wrinkles, elasticity and hydration.
  • •The PubMed record has no conflict-of-interest statement.
  • •Summarized from the PubMed abstract only. The full paper may hold details the abstract leaves out.

✓ Strength– Limit• Note

These points come from fixed rules about the type of study, its size and length, what it measured, and who has a stake. Every study on Digestery gets the same rules.

Where this study sits

Each dot is one on-topic paper on this question. Steps near the top answer the question more directly.

↑ Stronger evidence

  1. Trials in people: wrinkles, skin elasticity and moisture

    15

    13 benefit, 2 mixed

    ↑ This study is the ringed dot

  2. Trials in people: other measures

    1

    1 benefit

  3. Trials in people: lab tests or safety

    0

    None among the papers we read.

  4. Population studies

    0

    None among the papers we read.

  5. Blood levels and genes

    0

    None among the papers we read.

↓ Weaker evidence

  • Points to benefit
  • Mixed
  • No difference
  • No direction
  • Points to harm

How it fits with the other research

The short answer to “Does collagen reduce skin aging?”

Unclear; higher-quality trials found no effect.

Confidence: low. Based on 22 on-topic papers.

Read the full answer

Of the other 14 papers on the same step: 12 benefit, 2 mixed. This one found benefit. It agrees with most of them.

  • Quoted in “What we found”: Several tested drinks mixed collagen with vitamin C, zinc, biotin or joint compounds, so the effect of collagen alone cannot be separated.
  • Part of the finding “Many products were blends or company-linked”.
  • Marked as a key paper in the research timeline: Largest single trial here: 120 people, blended drink.

Other papers on the same step

See all 22 studies on this question

How this page was made

Label

First read of the abstract
Claude Sonnet
Independent second read
Claude Haiku
Differences settled
The reviewer corrected 1 field after reading the abstract. Claude Opus 5.5.
Headline
Claude Sonnet, from the checked study record. A script checked its numbers and wording.
Numbers
Checked against the abstract by a script
“How much this study counts”
Fixed rules, the same for every study
Source check by a person
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