People in Japan between 22 and 59 years old took a daily supplement of hyaluronan for 12 weeks and didn’t feel any bad side effects—so it seems safe for them to take it this way for a short time.
Claim Language
Language Strength
probability
Uses probability language (may, likely, can)
The claim uses 'were not reported' and 'suggesting', which imply observation-based inference rather than certainty. 'Not reported' indicates absence of evidence, not evidence of absence, and 'suggesting' introduces a tentative conclusion, placing it in the probability category.
Context Details
Domain
medicine
Population
human
Subject
Healthy Japanese adults aged 22–59
Action
were not reported
Target
adverse events
Intervention Details
Gold Standard Evidence Needed
According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.
Evidence from Studies
Supporting (1)
Oral hyaluronan relieves wrinkles: a double-blinded, placebo-controlled study over a 12-week period
The study gave people 120 mg of hyaluronan daily for 12 weeks and found no side effects, which means it’s safe for healthy Japanese adults in that age range — just like the claim says.