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.
Coenzyme Q10
Selected research topic
Men's health
Some measured outcomes improved in human comparison studies. Read these findings with their populations and conditions.
Findings from a combination study cannot be attributed to this ingredient alone.
Animal and cell findings do not establish the same effect in people.
Some findings concern patients or people with a deficiency.
- Publications for this topic
- 14
- Human comparison publications
- 1
- Publications needing review
- 4
Findings in the studies
sperm density
- A better result than the comparison group was reported.
What the comparison group used was not confirmed.
Patient group · Single ingredientMeasurement and study conditions
- Study type
- Randomized controlled trial: subjects were randomly assigned to groups for comparison.
- Study population
- Human participants · Patient group
- Ingredients tested
- Single ingredient
- How results were compared
- Results were compared between groups.
- Measurement time
- Not confirmed.
motility
Other human research, including observational studies and reviews
- A change was reported before and after use. Its cause cannot be isolated.
Several ingredients were tested together, so this ingredient’s individual effect is unknown.
Patient group · Combination study · after 3 months / 12 weeksMeasurement and study conditions
- Study type
- Controlled trial
- Study population
- Human participants · Patient group
- Ingredients tested
- Ingredient combination
- How results were compared
- Changes within the same group were compared. · Study comparison: within-group pre/post change; control group showed no significant change but no direct between-group
- Measurement time
- after 3 months / 12 weeks
normal semen analysis results
Other human research, including observational studies and reviews
- A change was reported before and after use. Its cause cannot be isolated.
Several ingredients were tested together, so this ingredient’s individual effect is unknown.
Patient group · Combination study · after 3 months / 12 weeksMeasurement and study conditions
- Study type
- Controlled trial
- Study population
- Human participants · Patient group
- Ingredients tested
- Ingredient combination
- How results were compared
- Changes within the same group were compared. · Study comparison: within-group pre/post change; control group showed no significant change but no direct between-group
- Measurement time
- after 3 months / 12 weeks
Progressive sperm motility
Other human research, including observational studies and reviews
- A change was reported, but the comparison could not be confirmed.
Several ingredients were tested together, so this ingredient’s individual effect is unknown.
Patient group · Combination studyMeasurement and study conditions
- Study type
- Randomized controlled trial: subjects were randomly assigned to groups for comparison.
- Study population
- Human participants · Patient group
- Ingredients tested
- Ingredient combination
- Measurement time
- Not confirmed.
Other measured outcomes (13)
Outcome needs clarification
About this measure
Original outcome name: SDF
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 · 3 months
Measurement and study conditions
- Study type
- Clinical trial
- Study population
- Human participants · Patient group
- Ingredients tested
- Single ingredient
- How results were compared
- Changes within the same group were compared. · Study comparison: Within-participant pre/post change after CoQ10-main-ingredient supplement; no control group reported
- Additional measurement information
- Primary outcome
- Measurement time
- 3 months
sperm count
Other human research, including observational studies and reviews
- An association was observed. This does not establish that the ingredient caused the change.
Several ingredients were tested together, so this ingredient’s individual effect is unknown.
Patient group · Combination study · 6 monthsMeasurement and study conditions
- Study type
- Observational study
- Study population
- Human participants · Patient group
- Ingredients tested
- Ingredient combination
- How results were compared
- Comparison unclear · Study comparison: reported after treatment; no untreated comparator described
- Additional measurement information
- Secondary outcome
- Measurement time
- 6 months
sperm density, morphology
Other human research, including observational studies and reviews
- A change was reported before and after use. Its cause cannot be isolated.
Several ingredients were tested together, so this ingredient’s individual effect is unknown.
Patient group · Combination study · 12 weeksMeasurement and study conditions
- Study type
- Controlled trial
- Study population
- Human participants · Patient group
- Ingredients tested
- Ingredient combination
- How results were compared
- Changes within the same group were compared. · Study comparison: within-group changes; no significant improvement in either group
- Measurement time
- 12 weeks
sperm progressive motility
Other human research, including observational studies and reviews
- An association was observed. This does not establish that the ingredient caused the change.Patient group · Single ingredient · three months
Measurement and study conditions
- Study type
- Observational study
- Study population
- Human participants · Patient group
- Ingredients tested
- Single ingredient
- How results were compared
- Comparison unclear · Study comparison: within-group before/after in patients; fertile controls not untreated disease comparator
- Additional measurement information
- Primary outcome
- Measurement time
- three months
sperm quality
Other human research, including observational studies and reviews
- An association was observed. This does not establish that the ingredient caused the change.Patient group · Single ingredient · 3 months
Measurement and study conditions
- Study type
- Observational study
- Study population
- Human participants · Patient group
- Ingredients tested
- Single ingredient
- How results were compared
- Comparison unclear · Study comparison: within-group change versus pretreatment values
- Additional measurement information
- Primary outcome
- Measurement time
- 3 months
vitality
Other human research, including observational studies and reviews
- A change was reported before and after use. Its cause cannot be isolated.
Several ingredients were tested together, so this ingredient’s individual effect is unknown.
Patient group · Combination study · after 3 months / 12 weeksMeasurement and study conditions
- Study type
- Controlled trial
- Study population
- Human participants · Patient group
- Ingredients tested
- Ingredient combination
- How results were compared
- Changes within the same group were compared. · Study comparison: within-group pre/post change; control group showed no significant change but no direct between-group
- Measurement time
- after 3 months / 12 weeks
post-thawing motility
Animal and cell research · indirect evidence
- A change was reported in animal or cell research.Single ingredient
Measurement and study conditions
- Study type
- Controlled trial
- Study population
- This is animal research. The specific characteristics of the subjects need further review.
- Ingredients tested
- Single ingredient
- How results were compared
- Comparison unclear · Study comparison: CoQ10 included in rabbit semen-extender cryopreservation protocol; abstract states post-thaw motilit
- Additional measurement information
- Secondary outcome
- Measurement time
- After cryopreservation and thawing
Sperm parameters
Animal and cell research · indirect evidence
- A change was reported in animal or cell research.Single ingredient
Measurement and study conditions
- Study type
- Animal study · indirect
- Study population
- This is animal research. The specific characteristics of the subjects need further review.
- Ingredients tested
- Single ingredient
- How results were compared
- Comparison unclear
- Measurement time
- Not confirmed.
clinical pregnancy odds
Research with unclear study subject or type
- A change was reported, but the comparison could not be confirmed.
Measurement and study conditions
- Study type
- Meta-analysis
- Study population
- Recorded population category: Patient group. Whether the research involved humans needs confirmation.
- Ingredients tested
- Unknown intervention
- How results were compared
- Study comparison: Pooled comparative clinical pregnancy odds for CoQ10 treatment in male-infertility trials; includes
- Measurement time
- Unspecified; source notes >3-month treatment in a subgroup analysis.
seminal CoQ10 levels
Research with unclear study subject or type
- A change was reported, but the comparison could not be confirmed.
Measurement and study conditions
- Study type
- Meta-analysis
- Study population
- Recorded population category: Patient group. Whether the research involved humans needs confirmation.
- Ingredients tested
- Unknown intervention
- How results were compared
- Study comparison: Pooled CoQ10 treatment versus control comparisons; mixed monotherapy and combination evidence limits
- Additional measurement information
- Biomarker
- Measurement time
- Varied; morphology benefit reported in studies longer than three months.
seminal volume
Research with unclear study subject or type
- A change was reported, but the comparison could not be confirmed.
Measurement and study conditions
- Study type
- Meta-analysis
- Study population
- Recorded population category: Patient group. Whether the research involved humans needs confirmation.
- Ingredients tested
- Unknown intervention
- How results were compared
- Study comparison: Pooled CoQ10 treatment versus control comparisons; mixed monotherapy and combination evidence limits
- Additional measurement information
- Biomarker
- Measurement time
- Varied; morphology benefit reported in studies longer than three months.
sperm concentration
Research with unclear study subject or type
- A change was reported, but the comparison could not be confirmed.
Measurement and study conditions
- Study type
- Meta-analysis
- Study population
- Recorded population category: Patient group. Whether the research involved humans needs confirmation.
- Ingredients tested
- Unknown intervention
- How results were compared
- Study comparison: Pooled CoQ10 treatment versus control comparisons; mixed monotherapy and combination evidence limits
- Additional measurement information
- Biomarker
- Measurement time
- Varied; morphology benefit reported in studies longer than three months.
total sperm motility
Research with unclear study subject or type
- A change was reported, but the comparison could not be confirmed.
Measurement and study conditions
- Study type
- Meta-analysis
- Study population
- Recorded population category: Patient group. Whether the research involved humans needs confirmation.
- Ingredients tested
- Unknown intervention
- How results were compared
- Study comparison: Pooled CoQ10 treatment versus control comparisons; mixed monotherapy and combination evidence limits
- Additional measurement information
- Biomarker
- Measurement time
- Varied; morphology benefit reported in studies longer than three months.
This result is held for interpretation. That does not mean research found no effect.
Outcome groups needing additional review (2)
- progressive motility · Distinct papers needing additional review: 1Interpretation held: 1
- sperm creatine concentration · Distinct papers needing additional review: 1Direction unclear: 1
One paper can appear under multiple measured outcomes or review reasons, so these counts should not be added together.
Representative outcome and study details
Studies with an unspecified organism reported a change with no confirmed comparison group in clinical pregnancy odds.
Scope not specified · Includes patient groups · comparator not confirmed
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: B
The 54.4 evidence score includes 1 independent human studies and 1 clinical studies in the representative benefit area. The B 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: 113
Papers linked to this topic 14 · distinct papers 14 · papers with a confirmed human comparison 1 · papers needing additional review 4
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.
- clinical pregnancy odds: Sources represented in this measurement group: 1 · Distinct papers with human comparisons for this outcome: 0
- motility: Sources represented in this measurement group: 1 · Distinct papers with human comparisons for this outcome: 0
- normal semen analysis results: Sources represented in this measurement group: 1 · Distinct papers with human comparisons for this outcome: 0
- post-thawing motility: Sources represented in this measurement group: 1 · Distinct papers with human comparisons for this outcome: 0
- progressive motility: Sources represented in this measurement group: 1 · Distinct papers with human comparisons for this outcome: 0
- Progressive sperm motility: Sources represented in this measurement group: 1 · Distinct papers with human comparisons for this outcome: 0
- SDF: Sources represented in this measurement group: 1 · Distinct papers with human comparisons for this outcome: 0
- seminal CoQ10 levels: Sources represented in this measurement group: 1 · Distinct papers with human comparisons for this outcome: 0
- seminal volume: Sources represented in this measurement group: 1 · Distinct papers with human comparisons for this outcome: 0
- sperm concentration: Sources represented in this measurement group: 1 · Distinct papers with human comparisons for this outcome: 0
- sperm count: Sources represented in this measurement group: 1 · Distinct papers with human comparisons for this outcome: 0
- sperm creatine concentration: Sources represented in this measurement group: 1 · Distinct papers with human comparisons for this outcome: 0
- sperm density: Sources represented in this measurement group: 1 · Distinct papers with human comparisons for this outcome: 1
- sperm density, morphology: Sources represented in this measurement group: 1 · Distinct papers with human comparisons for this outcome: 0
- Sperm parameters: Sources represented in this measurement group: 1 · Distinct papers with human comparisons for this outcome: 0
- sperm progressive motility: Sources represented in this measurement group: 1 · Distinct papers with human comparisons for this outcome: 0
- sperm quality: Sources represented in this measurement group: 1 · Distinct papers with human comparisons for this outcome: 0
- total sperm motility: Sources represented in this measurement group: 1 · Distinct papers with human comparisons for this outcome: 0
- vitality: Sources represented in this measurement group: 1 · Distinct papers with human comparisons for this outcome: 0
What the research found
sperm density, morphology
A change was reported before and after use. Its cause cannot be isolated.
Controlled study in people · Ingredient combination · Patient group
Several ingredients were used together. This does not establish the effect of this ingredient alone or synergy.
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.
motility
A change was reported before and after use. Its cause cannot be isolated.
Controlled study in people · Ingredient combination · Patient group
Several ingredients were used together. This does not establish the effect of this ingredient alone or synergy.
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.
normal semen analysis results
A change was reported before and after use. Its cause cannot be isolated.
Controlled study in people · Ingredient combination · Patient group
Several ingredients were used together. This does not establish the effect of this ingredient alone or synergy.
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.
sperm density
The study reported improvement in this measurement.
Controlled study in people · Single ingredient · Patient 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.
vitality
A change was reported before and after use. Its cause cannot be isolated.
Controlled study in people · Ingredient combination · Patient group
Several ingredients were used together. This does not establish the effect of this ingredient alone or synergy.
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.
SDF
A change was reported before and after use. Its cause cannot be isolated.
Other evidence · 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.
sperm count
An association was observed. This does not establish that the ingredient caused the change.
Observational study · Ingredient combination · Patient group
Several ingredients were used together. This does not establish the effect of this ingredient alone or synergy.
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.
sperm progressive motility
An association was observed. This does not establish that the ingredient caused the change.
Observational study · Single ingredient · Patient group
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.
sperm quality
An association was observed. This does not establish that the ingredient caused the change.
Observational study · Single ingredient · Patient group
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.
clinical pregnancy odds
A change was reported, but the comparison could not be confirmed.
Meta-analysis · Unknown intervention · Patient group
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.
Progressive sperm motility
A change was reported, but the comparison could not be confirmed.
Controlled study in people · 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
Direction counts are distinct papers within each row. Outcome contributions count endpoint results, so one paper may contribute more than once.
seminal CoQ10 levels
A change was reported, but the comparison could not be confirmed.
Meta-analysis · Unknown intervention · Patient group
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.
seminal volume
A change was reported, but the comparison could not be confirmed.
Meta-analysis · Unknown intervention · Patient group
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.
sperm concentration
A change was reported, but the comparison could not be confirmed.
Meta-analysis · Unknown intervention · Patient group
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 sperm motility
A change was reported, but the comparison could not be confirmed.
Meta-analysis · Unknown intervention · Patient group
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.
post-thawing motility
A change was reported in animal or cell research.
Animal study · indirect · Single ingredient · General population
This finding comes from animal or cell research. It does not establish the same effect in people.
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.
Sperm parameters
A change was reported in animal or cell research.
Animal study · indirect · Single ingredient · Patient group
This finding comes from animal or cell research. It does not establish the same effect in people.
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.
progressive motility
The study needs further checking before its result can be interpreted.
Controlled study in people · Single ingredient · General 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.
sperm creatine concentration
The study needs further checking before its result can be interpreted.
Controlled study in people · Ingredient combination · General 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
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.
Observational study · Single ingredient · Unspecified population
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.
Unspecified measured outcome
The study needs further checking before its result can be interpreted.
Other evidence · Unknown intervention · 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.
No combination cautions are available to show in the current data. This does not guarantee safety.
Review 2 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.
CurcuminThe study suggests a possible synergistic effect of nano-curcumin and CoQ10 on clinical features of migraine compared to monotherapy or placebo.
SeleniumCombined supplementation with selenium and Coenzyme Q10 resulted in significantly improved renal function markers compared to placebo.