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.
Calcium
Bone, joint, and mobility
Human studies reported an association with BMD; while Studies with an unspecified organism reported a change with no confirmed comparison group in BMD.
Scope not specified · Human studies · comparator not confirmed
Publications for this result: 2
Other outcomes and study details
Distinct publications linked to this topic: 7
- Study conditions differ; results are shown descriptively and are not pooled.
What has been studied?
Distinct human comparison papers: 2
areal bone density
- Comparison result:A better result than the comparison group was reported.Deficiency group · 18 months
Measurement and study conditions
- Controlled human study
- Controlled trial
- Unknown intervention
- Deficiency group
- Primary outcome
- Between-group comparison
- Timepoint: 18 months
- Study comparison: Calcium carbonate tablets or calcium-rich ground fish versus no calcium supplementation
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
Measurement and study conditions
- Observational study
- Observational study
- Unknown intervention
- General population
- Biomarker
- Comparison unclear
- Timepoint: Unspecified
- Study comparison: Observational dietary intake/status association as reported; this source does not establish a contro
Research with unclear study subject or type
- A change was reported, but the comparison could not be confirmed.General population · One to two years.
Measurement and study conditions
- Meta-analysis
- Meta-analysis
- Unknown intervention
- General population
- Biomarker
- Study subject not identified
- Timepoint: One to two years.
- Study comparison: Small reported BMD increases; comparator details are not supplied in this effect sentence. The autho
BMD at the femoral neck
Other human research, including observational studies and reviews
- A change was reported before and after use. Its cause cannot be isolated.Patient group · Single ingredient · 1 year
Measurement and study conditions
- Controlled human study
- Controlled trial
- Single ingredient
- Patient group
- Outcome role not specified
- Within-group comparison
- Timepoint: 1 year
- Study comparison: within-group pre/post among supplemented low-intake patients; higher-intake group was not supplement
Bone Mineral Density
- Comparison result:A better result than the comparison group was reported.Single ingredient
Measurement and study conditions
- Controlled human study
- Randomized trial
- Single ingredient
- Unspecified population
- Outcome role not specified
- Between-group comparison
- Timepoint: unspecified
- Study comparison: unspecified
Other measured outcomes (5)
forearm fracture
Research with unclear study subject or type
- A change was reported, but the comparison could not be confirmed.General population · varied across included trials
Measurement and study conditions
- Meta-analysis
- Meta-analysis
- Unknown intervention
- General population
- Primary outcome
- Study subject not identified
- Timepoint: varied across included trials
- Study comparison: Pooled calcium-supplement RCT outcomes; comparator arm not reported; monotherapy and calcium plus vi
fracture
Research with unclear study subject or type
- A change was reported, but the comparison could not be confirmed.General population · varies across included studies
Measurement and study conditions
- Review
- Systematic review
- Unknown intervention
- General population
- Secondary outcome
- Study subject not identified
- Timepoint: varies across included studies
- Study comparison: not_confirmed
hip
Research with unclear study subject or type
- A change was reported, but the comparison could not be confirmed.General population · varied across included trials
Measurement and study conditions
- Meta-analysis
- Meta-analysis
- Unknown intervention
- General population
- Primary outcome
- Study subject not identified
- Timepoint: varied across included trials
- Study comparison: Pooled calcium-supplement RCT outcomes; comparator arm not reported; monotherapy and calcium plus vi
total fracture
Research with unclear study subject or type
- A change was reported, but the comparison could not be confirmed.Single ingredient
Measurement and study conditions
- Meta-analysis
- Meta-analysis
- Single ingredient
- Unspecified population
- Outcome role not specified
- Study subject not identified
- Timepoint: unspecified
- Study comparison: unspecified
- A change was reported, but the comparison could not be confirmed.General population · varied across included trials
Measurement and study conditions
- Meta-analysis
- Meta-analysis
- Unknown intervention
- General population
- Primary outcome
- Study subject not identified
- Timepoint: varied across included trials
- Study comparison: Pooled calcium-supplement RCT outcomes; comparator arm not reported; monotherapy and calcium plus vi
vertebral fracture
Research with unclear study subject or type
- A change was reported, but the comparison could not be confirmed.General population · varied across included trials
Measurement and study conditions
- Meta-analysis
- Meta-analysis
- Unknown intervention
- General population
- Primary outcome
- Study subject not identified
- Timepoint: varied across included trials
- Study comparison: Pooled calcium-supplement RCT outcomes; comparator arm not reported; monotherapy and calcium plus vi
Research topics to explore
Research topics to explore
Review findings reported in each research area.
Topics with more linked papers appear first.
- View selected result
Bone, joint, and mobility
Related papers 7 · human comparison papers 2
- View results
Glucose and metabolic health
Related papers 7 · comparison findings need further review
- body weight · Interpretation held
- fat mass · Comparison details unconfirmed
More outcome groups: 3
- View results
Blood lipids
Related papers 3 · comparison findings need further review
- low density lipoprotein cholesterol (LDL-C) level · Comparison details unconfirmed
- low-density lipoprotein cholesterol · Some studies used more than one ingredient
More outcome groups: 1
- View results
Blood pressure and vascular health
Related papers 2 · comparison findings need further review
- blood pressure · Finding details are limited
- View results
Women's health
Related papers 2 · comparison findings need further review
- gestational hypertension · Some studies used more than one ingredient · Some studies included patients or people with a deficiency · Comparison details unconfirmed
- preeclampsia · Some studies used more than one ingredient · Some studies included patients or people with a deficiency · Comparison details unconfirmed
- View results
Cardiovascular events
Related papers 1 · comparison findings need further review
- cardiovascular mortality · Comparison details unconfirmed
- View results
Digestion and gut health
Related papers 1 · comparison findings need further review
- abdominal discomfort · Interpretation held
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 44.3 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: 52
Papers linked to this topic 7 · distinct papers 7 · papers with a confirmed human comparison 2 · papers needing additional review 2
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.
- areal bone density: Sources represented in this measurement group: 1 · Distinct papers with human comparisons for this outcome: 1
- BMD: Sources represented in this measurement group: 2 · Distinct papers with human comparisons for this outcome: 0
- BMD at the femoral neck: Sources represented in this measurement group: 1 · Distinct papers with human comparisons for this outcome: 0
- Bone Mineral Density: Sources represented in this measurement group: 1 · Distinct papers with human comparisons for this outcome: 1
- forearm fracture: Sources represented in this measurement group: 1 · Distinct papers with human comparisons for this outcome: 0
- fracture: Sources represented in this measurement group: 1 · Distinct papers with human comparisons for this outcome: 0
- hip: Sources represented in this measurement group: 1 · Distinct papers with human comparisons for this outcome: 0
- total fracture: Sources represented in this measurement group: 1 · Distinct papers with human comparisons for this outcome: 0
- vertebral fracture: Sources represented in this measurement group: 1 · Distinct papers with human comparisons for this outcome: 0
Bone, joint, and mobility
What the research found
areal bone density
The study reported improvement in this measurement.
Controlled study in people · Unknown intervention · Deficiency group
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.
BMD at the femoral neck
A change was reported before and after use. Its cause cannot be isolated.
Controlled study in people · Single ingredient · Patient group
Within-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.
Bone Mineral Density
The study reported improvement in this measurement.
Controlled study in people · Single ingredient · Unspecified 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.
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.
BMD
A change was reported, but the comparison could not be confirmed.
Meta-analysis · Unknown intervention · General population
Analysis coverage and paper counts
1 paper · 1 measured outcome
Review overlap with primary papers is unknown; counts stay separate.
Direction counts are distinct papers within each row. Outcome contributions count endpoint results, so one paper may contribute more than once.
forearm fracture
A change was reported, but the comparison could not be confirmed.
Meta-analysis · Unknown intervention · General population
Analysis coverage and paper counts
1 paper · 1 measured outcome
Review overlap with primary papers is unknown; counts stay separate.
Direction counts are distinct papers within each row. Outcome contributions count endpoint results, so one paper may contribute more than once.
fracture
A change was reported, but the comparison could not be confirmed.
Review · Unknown intervention · General population
Analysis coverage and paper counts
1 paper · 1 measured outcome
Review overlap with primary papers is unknown; counts stay separate.
Direction counts are distinct papers within each row. Outcome contributions count endpoint results, so one paper may contribute more than once.
hip
A change was reported, but the comparison could not be confirmed.
Meta-analysis · Unknown intervention · General population
Analysis coverage and paper counts
1 paper · 1 measured outcome
Review overlap with primary papers is unknown; counts stay separate.
Direction counts are distinct papers within each row. Outcome contributions count endpoint results, so one paper may contribute more than once.
total fracture
A change was reported, but the comparison could not be confirmed.
Meta-analysis · Single ingredient · Unspecified population
Analysis coverage and paper counts
1 paper · 1 measured outcome
Review overlap with primary papers is unknown; counts stay separate.
Direction counts are distinct papers within each row. Outcome contributions count endpoint results, so one paper may contribute more than once.
total fracture
A change was reported, but the comparison could not be confirmed.
Meta-analysis · Unknown intervention · General population
Analysis coverage and paper counts
1 paper · 1 measured outcome
Review overlap with primary papers is unknown; counts stay separate.
Direction counts are distinct papers within each row. Outcome contributions count endpoint results, so one paper may contribute more than once.
vertebral fracture
A change was reported, but the comparison could not be confirmed.
Meta-analysis · Unknown intervention · General population
Analysis coverage and paper counts
1 paper · 1 measured outcome
Review overlap with primary papers is unknown; counts stay separate.
Direction counts are distinct papers within each row. Outcome contributions count endpoint results, so one paper may contribute more than once.
Unspecified measured outcome
The study needs further checking before its result can be interpreted.
Meta-analysis · Unknown intervention · Unspecified population
The comparison could not be confirmed.
Analysis coverage and paper counts
1 paper · 1 measured outcome
1 papers held from direction counts
Review overlap with primary papers is unknown; counts stay separate.
Direction counts are distinct papers within each row. Outcome contributions count endpoint results, so one paper may contribute more than once.
Unspecified measured outcome
The study needs further checking before its result can be interpreted.
Review · Unknown intervention · Unspecified population
The comparison could not be confirmed.
Analysis coverage and paper counts
1 paper · 1 measured outcome
1 papers held from direction counts
Review overlap with primary papers is unknown; counts stay separate.
Direction counts are distinct papers within each row. Outcome contributions count endpoint results, so one paper may contribute more than once.
Glucose and metabolic health
What the research found
weight changes
Results for this measurement were mixed; no consistent conclusion can be drawn.
Meta-analysis · Single ingredient · General population
Between-group comparison
Analysis coverage and paper counts
1 paper · 1 measured outcome
Review overlap with primary papers is unknown; counts stay separate.
Direction counts are distinct papers within each row. Outcome contributions count endpoint results, so one paper may contribute more than once.
fat mass
A change was reported, but the comparison could not be confirmed.
Meta-analysis · Single ingredient · Unspecified population
Analysis coverage and paper counts
1 paper · 1 measured outcome
Review overlap with primary papers is unknown; counts stay separate.
Direction counts are distinct papers within each row. Outcome contributions count endpoint results, so one paper may contribute more than once.
risk of MetS
A change was reported, but the comparison could not be confirmed.
Meta-analysis · Unknown intervention · General population
Analysis coverage and paper counts
1 paper · 1 measured outcome
Review overlap with primary papers is unknown; counts stay separate.
Direction counts are distinct papers within each row. Outcome contributions count endpoint results, so one paper may contribute more than once.
type 2 diabetes
A change was reported, but the comparison could not be confirmed.
Meta-analysis · Unknown intervention · General population
Analysis coverage and paper counts
1 paper · 1 measured outcome
Review overlap with primary papers is unknown; counts stay separate.
Direction counts are distinct papers within each row. Outcome contributions count endpoint results, so one paper may contribute more than once.
body weight
The study needs further checking before its result can be interpreted.
Controlled study in people · Single ingredient · Unspecified population
Between-group comparison
Analysis coverage and paper counts
1 paper · 1 measured outcome
1 papers held from direction counts
Direction counts are distinct papers within each row. Outcome contributions count endpoint results, so one paper may contribute more than once.
Unspecified measured outcome
The study needs further checking before its result can be interpreted.
Review · Single ingredient · Unspecified population
Between-group comparison
Analysis coverage and paper counts
1 paper · 1 measured outcome
1 papers held from direction counts
Review overlap with primary papers is unknown; counts stay separate.
Direction counts are distinct papers within each row. Outcome contributions count endpoint results, so one paper may contribute more than once.
Unspecified measured outcome
The study needs further checking before its result can be interpreted.
Review · Unknown intervention · Unspecified population
The comparison could not be confirmed.
Analysis coverage and paper counts
1 paper · 1 measured outcome
1 papers held from direction counts
Review overlap with primary papers is unknown; counts stay separate.
Direction counts are distinct papers within each row. Outcome contributions count endpoint results, so one paper may contribute more than once.
Blood lipids
What the research found
low-density lipoprotein cholesterol
The study reported improvement in this measurement.
Review · Ingredient combination · Unspecified population
Several ingredients were used together. This does not establish the effect of this ingredient alone or synergy.
Between-group comparison
Analysis coverage and paper counts
1 paper · 1 measured outcome
Review overlap with primary papers is unknown; counts stay separate.
Direction counts are distinct papers within each row. Outcome contributions count endpoint results, so one paper may contribute more than once.
low density lipoprotein cholesterol (LDL-C) level
A change was reported, but the comparison could not be confirmed.
Meta-analysis · Single ingredient · Unspecified population
Analysis coverage and paper counts
1 paper · 1 measured outcome
Review overlap with primary papers is unknown; counts stay separate.
Direction counts are distinct papers within each row. Outcome contributions count endpoint results, so one paper may contribute more than once.
Total Cholesterol (TC) level
A change was reported, but the comparison could not be confirmed.
Meta-analysis · Single ingredient · Unspecified population
Analysis coverage and paper counts
1 paper · 1 measured outcome
Review overlap with primary papers is unknown; counts stay separate.
Direction counts are distinct papers within each row. Outcome contributions count endpoint results, so one paper may contribute more than once.
Unspecified measured outcome
The study needs further checking before its result can be interpreted.
Meta-analysis · Single ingredient · Unspecified population
Between-group comparison
Analysis coverage and paper counts
1 paper · 1 measured outcome
1 papers held from direction counts
Review overlap with primary papers is unknown; counts stay separate.
Direction counts are distinct papers within each row. Outcome contributions count endpoint results, so one paper may contribute more than once.
Blood pressure and vascular health
What the research found
blood pressure
The study reported improvement in this measurement.
Review · Single ingredient · Unspecified population
Between-group comparison
Analysis coverage and paper counts
1 paper · 3 measured outcomes
Review overlap with primary papers is unknown; counts stay separate.
Direction counts are distinct papers within each row. Outcome contributions count endpoint results, so one paper may contribute more than once.
Unspecified measured outcome
The study needs further checking before its result can be interpreted.
Review · Single ingredient · Unspecified population
Between-group comparison
Analysis coverage and paper counts
1 paper · 1 measured outcome
1 papers held from direction counts
Review overlap with primary papers is unknown; counts stay separate.
Direction counts are distinct papers within each row. Outcome contributions count endpoint results, so one paper may contribute more than once.
Unspecified measured outcome
The study needs further checking before its result can be interpreted.
Review · Unknown intervention · Unspecified population
The comparison could not be confirmed.
Analysis coverage and paper counts
1 paper · 1 measured outcome
1 papers held from direction counts
Review overlap with primary papers is unknown; counts stay separate.
Direction counts are distinct papers within each row. Outcome contributions count endpoint results, so one paper may contribute more than once.
Women's health
What the research found
gestational hypertension
A change was reported, but the comparison could not be confirmed.
Meta-analysis · Ingredient combination · Patient group
Several ingredients were used together. This does not establish the effect of this ingredient alone or synergy.
Analysis coverage and paper counts
1 paper · 1 measured outcome
Review overlap with primary papers is unknown; counts stay separate.
Direction counts are distinct papers within each row. Outcome contributions count endpoint results, so one paper may contribute more than once.
preeclampsia
A change was reported, but the comparison could not be confirmed.
Meta-analysis · Ingredient combination · Patient group
Several ingredients were used together. This does not establish the effect of this ingredient alone or synergy.
Analysis coverage and paper counts
1 paper · 1 measured outcome
Review overlap with primary papers is unknown; counts stay separate.
Direction counts are distinct papers within each row. Outcome contributions count endpoint results, so one paper may contribute more than once.
preeclampsia
The study needs further checking before its result can be interpreted.
Review · Single ingredient · Patient group
The comparison could not be confirmed.
Analysis coverage and paper counts
1 paper · 1 measured outcome
1 papers held from direction counts
Review overlap with primary papers is unknown; counts stay separate.
Direction counts are distinct papers within each row. Outcome contributions count endpoint results, so one paper may contribute more than once.
Cardiovascular events
What the research found
cardiovascular mortality
A change was reported, but the comparison could not be confirmed.
Meta-analysis · Unknown intervention · General population
Analysis coverage and paper counts
1 paper · 1 measured outcome
Review overlap with primary papers is unknown; counts stay separate.
Direction counts are distinct papers within each row. Outcome contributions count endpoint results, so one paper may contribute more than once.
Digestion and gut health
What the research found
abdominal discomfort
The study needs further checking before its result can be interpreted.
Controlled study in people · Single ingredient · Patient group
The comparison could not be confirmed.
Analysis coverage and paper counts
1 paper · 1 measured outcome
1 papers held from direction counts
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.
Caution findings
2
Findings from individual and combined use, plus reviewed cautions
Key precautions
No reviewed caution rules are available yet. Reported caution findings are shown below.
These findings were reported in studies. They do not predict an individual's experience.
Findings to review with care
Side effects reported for the ingredient alone are separated from findings involving another supplement or medication.
Side effects reported with this ingredient alone
Symptoms or adverse events reported in studies without another active ingredient.
abdominal discomfort1 papers
One patient experienced abdominal discomfort during calcium supplementation (500 mg/day).Human studies · Observational studyCautions reported with another supplement or medication
These studies reported worsening outcomes, reduced absorption, or other cautions with combined use. They do not predict an individual's outcome.
당뇨병Calcium supplementation showed significant multiplicative and additive interaction with diabetes status, increasing CVD risk in diabetic individuals.