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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
Mostly mechanism / observational
Top outcomes
Verdict
Likely helps
11 of 15 studies with measurable effects showed benefit.
Top outcomes
Investigational — NO approved monotherapy dose. Phase-2 trials used once-weekly subcutaneous injection with stepwise escalation up to 4.5 mg maintenance. There is no approved standalone regimen; do not self-dose an unapproved drug.
once-weekly
Once-weekly subcutaneous injection (investigational only)
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
Over 26 weeks
Over 20-32 weeks
By 32 weeks
Especially during dose escalation
2-4 weeks
4-8 weeks
4-12 weeks
Once-weekly cagrilintide for weight management in people with overweight and obesity: a multicentre, randomised, double-blind, placebo-controlled and active-controlled, dose-finding phase 2 trial.
Lancet (2021) · Rct · n=706
Phase-2, double-blind, randomised, placebo- and active-controlled dose-finding trial across 57 sites in ten countries; 706 adults with overweight/obesity (no diabetes) on once-weekly subcutaneous cagrilintide 0.3-4.5 mg vs liraglutide 3.0 mg vs placebo over 26 weeks
Safety, tolerability, pharmacokinetics, and pharmacodynamics of concomitant administration of multiple doses of cagrilintide with semaglutide 2·4 mg for weight management: a randomised, controlled, phase 1b trial.
Lancet (2021) · Rct · n=95
Phase-1b, randomised, placebo-controlled, multiple-ascending-dose trial in 95 treated adults with overweight/obesity; once-weekly subcutaneous cagrilintide 0.16-4.5 mg co-administered with semaglutide 2.4 mg over 20 weeks
Efficacy and safety of co-administered once-weekly cagrilintide 2·4 mg with once-weekly semaglutide 2·4 mg in type 2 diabetes: a multicentre, randomised, double-blind, active-controlled, phase 2 trial.
Lancet (2023) · Rct · n=92
Phase-2, double-blind, active-controlled trial in 92 adults with type 2 diabetes on metformin ± SGLT2 inhibitor; once-weekly CagriSema vs semaglutide vs cagrilintide (all escalated to 2.4 mg) over 32 weeks
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).
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 5/10) and wins in 3 of 3 categories.
No known interactions between Cagrilintide and Iron have been documented in our database. However, always consult a healthcare provider before combining supplements.