Improvement after a supplement is not the same as a comparative result
Start with the comparison. A before-and-after change alone cannot isolate the contribution of an ingredient.
Vitamin C
Selected research topic
Bone, joint, and mobility
These studies examined an association between use and measured outcomes. They do not establish cause and effect.
- Publications for this topic
- 2
- Human comparison publications
- 1
- Publications needing review
- 0
Findings in the studies
hip fractures
Other human research, including observational studies and reviews
- An association was observed. This does not establish that the ingredient caused the change.General population · 15–17 years of follow-up.
Measurement and study conditions
- Study type
- Observational study
- Study population
- Human participants · General population
- Ingredients tested
- Unknown intervention
- How results were compared
- Results were compared between groups. · Study comparison: Observational comparison of highest versus lowest total vitamin C intake; dietary intake alone was n
- Additional measurement information
- Primary outcome
- Measurement time
- 15–17 years of follow-up.
trochanter-BMD
Other human research, including observational studies and reviews
- An association was observed. This does not establish that the ingredient caused the change.General population · baseline and 4-year BMD change
Measurement and study conditions
- Study type
- Observational study
- Study population
- Human participants · General population
- Ingredients tested
- Unknown intervention
- How results were compared
- Comparison unclear · Study comparison: observational associations by sex, smoking, and nutrient intake strata
- Additional measurement information
- Secondary outcome
- Measurement time
- baseline and 4-year BMD change
Representative outcome and study details
Human studies reported an association with hip fractures.
Scope not specified · Human studies · between-group comparison
1 publications linked to this result
- Route, form, dose, or population details are incomplete, so the findings cannot be confirmed as directly comparable.
Data coverage and detailed study classifications
Paper counts are separated by research topic below. One paper may contribute to multiple findings.
Analysis status: Public-ready
Ingredient analysis date:
How the grade was determined: C
The 50.0 evidence score includes 1 independent human studies and 1 clinical studies in the representative benefit area. The C tier remains conservative because of limited repetition across independent human clinical studies, too few clinical findings with an explicit effect direction.
The grade is based mainly on the research area with the most evidence. It does not mean the same result was found in other areas.
Papers linked to this ingredient overall: 106
Papers linked to this topic 2 · distinct papers 2 · papers with a confirmed human comparison 1 · papers needing additional review 0
A publication may appear in more than one count. These numbers should not be added. Ingredient-wide papers, topic-linked papers, and sources in outcome groups use different scopes. Adding source counts may count the same paper more than once.
- hip fractures: Sources represented in this measurement group: 1 · Distinct papers with human comparisons for this outcome: 1
- trochanter-BMD: Sources represented in this measurement group: 1 · Distinct papers with human comparisons for this outcome: 0
What the research found
hip fractures
An association was observed. This does not establish that the ingredient caused the change.
Observational study · Unknown intervention · General population
Between-group comparison
Analysis coverage and paper counts
1 paper · 1 measured outcome
Direction counts are distinct papers within each row. Outcome contributions count endpoint results, so one paper may contribute more than once.
trochanter-BMD
An association was observed. This does not establish that the ingredient caused the change.
Observational study · Unknown intervention · General population
The comparison could not be confirmed.
Analysis coverage and paper counts
1 paper · 1 measured outcome
Direction counts are distinct papers within each row. Outcome contributions count endpoint results, so one paper may contribute more than once.
How to read research findings
How should I read research findings?
Research guidesNo clear difference and an uninterpretable result are different
A reported null comparison contains a result. An abstract without an interpretable comparison leaves a question unresolved.
Paper counts and study counts are different
Count original research separately from research that reanalyzes it. Publication volume is neither replication nor a quality rating.
Side effects and combination findings
Findings from this ingredient alone are shown separately from those involving another supplement or medication.
No combination cautions are available to show in the current data. This does not guarantee safety.
Review 1 combination findings and 0 findings that outperformed an ingredient alone.
Reported improvements with combinations
Combination findings are grouped by how the study compared them. This is not a recommendation to combine ingredients.
Combinations with reported improvement
The combination showed improvement, but each ingredient's contribution is unclear.
비타민 EIn a triple-blind RCT of 60 women with endometriosis, daily supplementation with 1000 mg Vitamin C and 800 IU Vitamin E for 8 weeks significantly reduced pelvic pain, dysmenorrhea, and dyspareunia (p < 0.001) compared to placebo.