Iron and Levodopa/Carbidopa: what the published research says
PubMed indexes 6 records that name Iron and Levodopa/Carbidopa together, either in the title or in an interaction, co-administration, or pharmacokinetic context. Each one is listed below with its study design and, where the abstract states one, the authors’ own conclusion, quoted and linked. This page reports that literature. It does not tell you whether to combine them.
Every statement below is attributed to a named, dated, linked source.
This page lists published research relevant to Iron and Levodopa/Carbidopa. It deliberately does not state whether the combination is safe, whether it interacts, in which direction, at what dose, or how far apart to take them.
A study appearing here is not proof that an interaction exists. Two substances can be named together in a paper that never tested them in combination, and a source listed as background may cover only one of them.
Findings are quoted from each abstract as the authors wrote them. NutriStack has not re-analysed, pooled, or reconciled them, and they may disagree with each other.
NutriStack’s own interaction assessment for this pair is not published here. It has not completed qualified-human clinical review, so it is withheld from search. See the publication gate.
Nothing here is medical advice. Decisions about prescription medication and supplements belong with your prescriber or pharmacist, who can see your full regimen.
The research
6 studies naming Iron and Levodopa/Carbidopa.
Strongest relevance first: papers naming both substances in the title, then human trials and systematic reviews.
Clinical pharmacology and therapeutics · 1989 · PMID 2920496
Clinical TrialRandomized Controlled Trial
“Chelation of iron by levodopa is the likely mechanism for this drug interaction. The clinical significance of this interaction is yet to be established.”
Names both Iron and Levodopa/Carbidopa in its title.
Biometals : an international journal on the role of metal ions in biology, biochemistry, and medicine · 2024 · PMID 39212870
ReviewHuman subjects
“Herein, we reviewed the mechanisms by which iron deposition may be associated with LID development, which are mainly related to oxidative stress, neuroinflammation, and mitochondrial and lysosomal dysfunction. Using iron as an important target, the search and development of safe and effective brain iron scavengers, and thus the alleviation and treatment of LID, has a very important scientific and clinical value, as well as a good application prospect.”
Names both Iron and Levodopa/Carbidopa in its title.
bioRxiv : the preprint server for biology · 2024 · PMID 39345474
Preprint
“This highlights the need for careful consideration of its effects on iron metabolism as a consequence of use in the long-term management of PD. Further experimental validation is required to confirm these interactions, and also to explore potential strategies to mitigate iron-related side effects while preserving therapeutic efficacy.”
Names both Iron and Levodopa/Carbidopa in its title.
Tremor and other hyperkinetic movements (New York, N.Y.) · 2023 · PMID 37008995
Systematic ReviewHuman subjects
“This updated review showed that RLS is two to three times more common in patients with CKD compared to the general population. More patients with CKD-A-RLS demonstrated increased mortality, increased incidence of cardiovascular accident, depression, insomnia and impaired quality of life than those with CKD without RLS.”
Names Iron and Levodopa/Carbidopa together in an interaction, co-administration, or pharmacokinetic context.
“We found evidence for levodopa positive interaction with coffee, fiber and vitamin C, as well as for the potential beneficial impact of low-fat and protein redistribution diet. Contrastingly, high-protein diet and ferrous sulfate supplements can negatively affect levodopa pharmacokinetics and effectiveness. For other drugs, the data of food impact are scarce.”
Names Iron and Levodopa/Carbidopa together in an interaction, co-administration, or pharmacokinetic context.
Tremor and other hyperkinetic movements (New York, N.Y.) · 2020 · PMID 32775036
Systematic ReviewHuman subjects
Names Iron and Levodopa/Carbidopa together in an interaction, co-administration, or pharmacokinetic context.
Limitations
What this evidence cannot tell you.
Search-based evidence indexes have real limits, and it is worth being explicit about them:
Selection. These records were found by searching PubMed titles and abstracts for both substance names alongside interaction and pharmacokinetic terms. Relevant work that phrases things differently, or is not indexed in PubMed, will be missing.
No effect size. The quoted conclusions are the authors’ words about their own study. We have not extracted effect direction or magnitude, and a single study’s conclusion is not a consensus.
Population mismatch. Findings in healthy volunteers, animals, or a specific patient group may not transfer to you, your dose, or your formulation.
Absence is not safety. Few published studies means the combination is under-studied, which is not the same as established as safe.
Nearby evidence
Other pairs with published research.
Pages covering Iron or Levodopa/Carbidopa alongside a different substance.
NutriStack is a free iPhone app for organising a supplement routine: what you take, when, and what the published record says about it. Its exploratory interaction checker covers Iron, Levodopa/Carbidopa, and several hundred other substances.
The checker is a research and organisation tool, not a clinical decision aid, and its per-pair assessments are excluded from search until they pass claim-level review.
NutriStack is an informational and organizational tool, not a medical service, and not a substitute for professional advice. Always consult a qualified healthcare professional before starting, stopping, or changing any supplement or medication.