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Head-to-head evidence comparison — which supplement is right for you?
Iron wins 3 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Likely helps
11 of 15 studies with measurable effects showed benefit.
Top outcomes
Verdict
Mostly mechanism / observational
Top outcomes
18-45mg elemental iron for deficiency (varies by severity)
On empty stomach if tolerated, Away from tea, coffee, dairy
Ferrous bisglycinate (gentle, well-absorbed) or iron protein succinylate
INVESTIGATIONAL — no approved consumer dose. In trials, once-daily oral orforglipron was titrated up to 36 mg (some phase-2 cohorts to 45 mg) with gradual dose escalation to limit GI side effects. Not for self-administration; only appropriate within a clinical trial or, if/when approved, under a prescribing clinician.
any
Oral tablet (investigational)
2-4 weeks
4-8 weeks
4-12 weeks
Weeks to months
Months (titrated)
Throughout use
Especially during dose escalation
Daily oral iron supplementation during pregnancy
The Cochrane database of systematic reviews (2024) · Meta analysis · n=48971
There is probably little to no difference in maternal death (2 versus 4 events, RR 0.57, 95% CI 0.12 to 2.69; 3 trials, 14,060 women; moderate-certainty evidence).
The Prevalence of Anemia among Pregnant Women in China: A Systematic Review and Meta-Analysis
Nutrients (2024) · Meta analysis · n=722
The results showed that the prevalence of anemia, ID, and IDA among pregnant women in China were 30.7% (95% CI: 26.6%, 34.7%), 45.6% (95% CI: 37.0%, 54.2%), and 17.3% (95% CI: 13.9%, 20.7%), respectively.
Treatment for women with postpartum iron deficiency anaemia
The Cochrane database of systematic reviews (2024) · Meta analysis · n=572
Intravenous iron versus oral iron supplementation The evidence is very uncertain about the effect of intravenous iron on mortality (risk ratio (RR) 2.95, 95% confidence interval (CI) 0.12 to 71.96; P = 0.51; I² = not applicable; 3 RCTs; 1 event; 572 women; very low-certainty evidence).
Orforglipron, an Oral Small-Molecule GLP-1 Receptor Agonist for Obesity Treatment (ATTAIN-1).
N Engl J Med (2025) · Rct · n=3127
Phase-3 multinational double-blind RCT in 3,127 adults with obesity WITHOUT diabetes; once-daily oral orforglipron 6/12/36 mg vs placebo for 72 weeks
Orforglipron, an Oral Small-Molecule GLP-1 Receptor Agonist, in Early Type 2 Diabetes (ACHIEVE-1).
N Engl J Med (2025) · Rct · n=559
Phase-3 double-blind RCT in 559 adults with early type 2 diabetes managed by diet/exercise; once-daily oral orforglipron 3/12/36 mg vs placebo for 40 weeks
Orforglipron compared with dapagliflozin in adults with type 2 diabetes and inadequate glycaemic control with metformin (ACHIEVE-2): a multicentre, randomised, non-inferiority, open-label, phase 3 trial.
Lancet (2026) · Rct · n=962
Phase-3 non-inferiority RCT (n=962) in type 2 diabetes inadequately controlled on metformin; once-daily oral orforglipron 3/12/36 mg vs dapagliflozin 10 mg over 40 weeks
Based on meta-analyses showing hemoglobin improvements of 2.01-5.30 g/dL in iron deficient populations. Higher doses show diminishing returns with increased GI side effects. Effectiveness varies significantly by baseline iron status and form used.
AI-estimated from published studies. Interpret as directional guidance.
Iron has a higher evidence score (9/10 vs 5.5/10) and wins in 3 of 3 categories.
No known interactions between Iron and Orforglipron have been documented in our database. However, always consult a healthcare provider before combining supplements.