Nutrient status and deficiency
Blood-Level or Deficiency Marker
Goal tierNot rated yet
No direct evidence for general supplement use is confirmed under the current standard.
Check this goal in more detailPublic-ready6/30/2026
Iron
Papers analyzed
50
Blood-Level or Deficiency MarkerBlood pressure and vascular health markersMenstrual and women's health
Main benefit evidence
Review human evidence by goal.
Blood pressure and vascular health
Blood pressure and vascular health markers
Goal tierNot rated yet
The currently linked research coverage is not broad enough to characterize this goal yet.
Check this goal in more detailWomen's health
Menstrual and women's health
Goal tierNot rated yet
The currently linked research coverage is not broad enough to characterize this goal yet.
Check this goal in more detailImmune and respiratory health
Immune and respiratory support
Goal tierNot rated yet
The currently linked research coverage is not broad enough to characterize this goal yet.
Check this goal in more detailBlood lipids
Cholesterol and triglycerides
Goal tierNot rated yet
The currently linked research coverage is not broad enough to characterize this goal yet.
Check this goal in more detailGlucose and metabolic health
Glucose and metabolic health markers
Goal tierNot rated yet
The currently linked research coverage is not broad enough to characterize this goal yet.
Check this goal in more detailSide effects and combination findings in studies
Findings from studies of this ingredient alone are separated from findings involving another supplement or medication.
Caution signals
5
Side effects + combos + curated rules
Key precautions
No curated contraindication rule is available yet, but literature caution signals are shown below.
These are signals reported in studies. They do not predict what will happen to an individual.
Findings to review with care
Side effects reported for the ingredient alone are separated from findings involving another supplement or medication.
Side effects reported when this ingredient was used alone
Symptoms or adverse events reported in studies of this ingredient without another active ingredient.
Side effects1 papers
Women receiving intermittent iron supplements were less likely to experience adverse side effects compared to those receiving daily supplements, though side effects were still more common than in the control group.Human studies · Systematic reviewNausea1 papers
Daily oral iron supplementation significantly increased odds of nausea (adjusted OR 3.56, p<0.001) compared to intermittent supplementation in pregnant women.Human studies · Meta-analysisDiarrhea1 papers
Daily oral iron supplementation significantly increased odds of diarrhea (adjusted OR 5.40, p=0.002) compared to intermittent supplementation in pregnant women.Human studies · Meta-analysisConstipation1 papers
Daily oral iron supplementation significantly increased odds of constipation (adjusted OR 1.95, p=0.006) compared to intermittent supplementation in pregnant women.Human studies · Meta-analysisIncidence of diarrhea1 papers
Both SQ-LNS products increased the incidence and longitudinal prevalence of diarrhea, vomiting, and rash/sores.Human studies · Randomized controlled trial